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Lasmigona compressa Lea, 1829 - creek heelsplitter (CMC, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. Shown here is a modern freshwater bivalve shell of Lasmigona compressa, the creek heelsplitter. The common name is in reference to the sharp edges of the shells that project upward when partially buried in sediments. From museum signage: Mussels of the Little Miami River The Little Miami River flowing through the eastern portion of Cincinnati is a national scenic river. Of the nation's 4,000 rivers, only 165 have been honored with such a designation. A national scenic river is one that includes an "outstandingly remarkable" biologic community. Displayed here are the 50 types of native mussels that have been recorded from the river and its tributaries. Nine of these species are no longer found in the Little Miami system due to water quality deterioration. Water pollution has also caused the disappearance of 7 of the 113 fishes recorded from the river. With better control of soil erosion and improved treatment of sewage effluent, the missing mussel and fish species could return to the Little Miami basin. Classification: Animalia, Mollusca, Bivalvia, Palaeoheterodonta, Unionoida, Unionidae See info. at: en.wikipedia.org/wiki/Lasmigona_compressa and www.iucnredlist.org/details/11359/0 and www.dnr.state.mn.us/rsg/profile.html?action=elementDetail...
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Summary[
edit] Description: English: Chione cancellata Linnaeus, 1767 - cross-barred venus clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The cross-barred venus clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Veneridae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Chione_cancellata. Date: 4 January 2016, 12:03:14. Source:
https://www.flickr.com/photos/47445767@N05/24432227213/. Author: James St. John.
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Summary[
edit] Description: English: Tellina magna Spengler, 1798 - great Caribbean tellin clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The great Caribbean tellin clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Tellinidae Locality: unrecorded/undisclosed/unspecified. Date: 4 January 2016, 12:00:53. Source:
https://www.flickr.com/photos/47445767@N05/24691348379/. Author: James St. John.
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Summary[
edit] Description: English: Lampsilis siliquoidea (Barnes, 1823) - fatmucket clam (CMC, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. Shown here is a modern freshwater bivalve shell of Lampsilis siliquoidea, the oddly-named fatmucket clam. From museum signage: Mussels of the Little Miami River The Little Miami River flowing through the eastern portion of Cincinnati is a national scenic river. Of the nation's 4,000 rivers, only 165 have been honored with such a designation. A national scenic river is one that includes an "outstandingly remarkable" biologic community. Displayed here are the 50 types of native mussels that have been recorded from the river and its tributaries. Nine of these species are no longer found in the Little Miami system due to water quality deterioration. Water pollution has also caused the disappearance of 7 of the 113 fishes recorded from the river. With better control of soil erosion and improved treatment of sewage effluent, the missing mussel and fish species could return to the Little Miami basin. Classification: Animalia, Mollusca, Bivalvia, Palaeoheterodonta, Unionoida, Unionidae See info. at: en.wikipedia.org/wiki/Lampsilis_siliquoidea. Date: 22 January 2010, 12:31:46. Source:
https://www.flickr.com/photos/47445767@N05/24912126557/. Author: James St. John.
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Mollusc shells on a marine beach in Florida, USA (December 2012). Sanibel Island is one of dozens of barrier islands in the West-Central Florida Barrier Chain. This 191-mile long, slightly sinuous stretch of islands is located along the Gulf of Mexico coast of southern Florida. The southern-most island in the chain is Cape Romano Island. The northern-most islands are the Anclote Keys. Sanibel Island is located between Captiva Island and mainland Florida, just offshore from the towns of Fort Myers and Cape Coral, Florida. Much of Sanibel Island is developed, but significant tracts have been allowed to become wilderness - especially Ding Darling National Wildlife Refuge. Sanibel is on the southern side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. A tidal inlet occurs on the island's western side - Blind Pass (a man-made construct). To the east of Sanibel is a moderately broad waterway - San Carlos Pass. Sanibel Island and nearby Captiva Island, North Captiva Island, and Cayo Costa Island are Holocene barriers that rim the southern and western sides of a Late Miocene depression that is now Pine Island Sound. Middle Miocene limestone bedrock was subject to significant dissolution and karst/cave development. The Pine Island Sound area was a large karst depression in the Late Miocene. It is now filled with sediments - most of modern Pine Island Sound is significantly shallow. Sanibel is famous for its shell-rich marine beaches. The Sanibel Island area has the 3rd-richest seashell beaches on Earth and the # 1 richest shell beaches in the Western Hemisphere. Shell collecting is best after a storm. The beach shown above is Algiers Beach, which is part of Gulfside City Park on the southern shoreline of Sanibel Island. About 99% of the shells on Sanibel Island beaches are bivalves (clams). Relatively few snails (gastropods) are present, but they are more common and conspicuous after storm events. Other marine remains observed on these beaches include sea urchins (echinoids), starfish (asteroids), crabs (decapods), horseshoe crabs (xiphosurans), sponges (poriferans), stony corals (anthozoan cnidarians), sea squirts (tunicates), sea hares (anaspidean opisthobranch gastropods), worm tubes, fish & fish skeletons, and stingray barbs. Locality: Algiers Beach, southern shore of Sanibel Island, Gulf of Mexico coast of southwestern Florida, USA (vicinity of 26° 25' 27.64" North latitude, 82° 03' 56.17" West longitude) West-Central Florida Barrier Chain geologic info. synthesized from: Evans et al. (1985) - Bedrock controls on barrier island development: west-central Florida coast. Marine Geology 63: 263-283. Davis (1989) - Morphodynamics of the West-Central Florida barrier system: the delicate balance between wave- and tide-domination. Proceedings, Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap Symposium, 'Coastal Lowlands, Geology and Geotechnology', 1987: 225-235. Evans et al. (1989) - Quaternary stratigraphy of the Charlotte Harbor estuarine-lagoon system, southwest Florida: implications of the carbonate-siliciclastic transition. Marine Geology 88: 319-348.
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Summary[
edit] Description: English: Mollusc shells on a marine beach in Florida, USA (December 2012). Several beaches along the Gulf of Mexico coast of southern Florida are famous for having an abundance of shells - they form moderately thick piles along the shoreline. The relative abundance and quality of shells varies from site to site and with weather & seasonal conditions. The shells shown above are 99% bivalves, but other organisms are also present. Ark clams and venus clams are most common here, but I also see scallop shells and slipper snail shells. Locality: Fort DeSoto Gulf Pier Beach - marine shoreline just north of the southwestern corner of Mullet Key, Fort DeSoto County Park, northwestern Tampa Bay, southwestern Florida, USA. Date: 18 December 2012, 16:58:50. Source:
https://www.flickr.com/photos/47445767@N05/26324806961/. Author: James St. John.
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Summary[
edit] Description: English: Atrina sp. - pen shell in Florida, USA (December 2012). Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The brown shell shown above is a pen shell, Atrina sp. This is the interior surface of a right valve (anterior to the left, posterior to the right, dorsal at top, ventral at bottom). Atrina bivalves are known in the fossil record - their reported age range is Triassic to Holocene. Atrina shells are thin, moderately fragile, and relatively organic-rich (Atrina shells can be partially dissolved by the dilute bleach that is used to clean these and eliminate foul odors). The interior surface of individual Atrina shells has some attractive, rainbow-iridescent nacreous aragonite. The subcircular, whitish-colored patches on this shell appear to be encrusting oysters. Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Pterioida, Pinnidae Locality: Algiers Beach, southern shore of Sanibel Island, Gulf of Mexico coast of southwestern Florida, USA (vicinity of 26° 25' 27.64" North latitude, 82° 03' 56.17" West longitude). Date: 15 December 2012, 11:33:22. Source:
https://www.flickr.com/photos/47445767@N05/25238057312/. Author: James St. John.
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Summary[
edit] Description: Français : Tricolia pullus en cours d'extension hors de sa coquille. Date: 31 March 2007, 20:27:37. Source: Own work. Author:
Ar rouz. Camera location
47° 35′ 00″ N, 2° 45′ 00″ W View all coordinates using:
OpenStreetMap 47.583333; -2.750000. Golfe du Morbihan, France Licensing[
edit] : This file is licensed under the
Creative Commons Attribution-Share Alike 4.0 International license. :. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the
same or compatible license as the original. https://creativecommons.org/licenses/by-sa/4.0 CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue.
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Summary[
edit] Description: English: Tellina listeri Röding, 1798 - speckled tellin clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The speckled tellin clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Tellinidae Locality: unrecorded/undisclosed/unspecified. Date: 4 January 2016, 11:58:44. Source:
https://www.flickr.com/photos/47445767@N05/24428331274/. Author: James St. John.
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S. Rae|sourceurl=https://flickr.com/photos/35142635@N05/48338146396%7Carchive=https://web.archive.org/web/20200531232902/https://www.flickr.com/photos/35142635@N05/48338146396%7Creviewdate=2019-09-14 07:28:25|reviewlicense=cc-by-2.0|reviewer=FlickreviewR 2
Wikimedia Commons
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Summary[
edit] Description: English: Mimachlamys nobilis (Reeve, 1852) - left valve of a noble scallop (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Orientation: anterior to the left; posterior to the right; dorsal at top; ventral at bottom Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. Scallops are distinctive bivalves with nearly symmetrical valves. The convexity and color of the two valves of an individual can vary dramatically in many species. The noble scallop shown above is part of the Japanese Province: "Sandwiched between the cold-waters of northern Japan and the warmer, more southerly areas of Okinawa and Taiwan is the rather isolated Japanese Province containing such endemic species as the noble scallop, Japanese wonder shell and many latiaxis snails. This temperate-water area supports about 1,500 species, including the famous Japanese pearl oyster." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Pectinoida, Pectinidae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Mimachlamys. Date: 3 January 2016, 16:47:05. Source:
https://www.flickr.com/photos/47445767@N05/24715615790/. Author: James St. John.
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Summary[
edit] Description: English: Chione cancellata Linnaeus, 1767 - cross-barred venus clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The cross-barred venus clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Veneridae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Chione_cancellata. Date: 4 January 2016, 12:03:09. Source:
https://www.flickr.com/photos/47445767@N05/24691458989/. Author: James St. John.
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Summary[
edit] Description: English: Trachycardium magnum (Linnaeus, 1758) - magnum cockle (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) This species is also known as Acrosterigma magna. Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The magnum cockle shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Cardiidae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Acrosterigma_magnum. Date: 4 January 2016, 12:03:58. Source:
https://www.flickr.com/photos/47445767@N05/24940852492/. Author: James St. John.
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Summary[
edit] Description: Español: Moluscos de las clases Gastropoda, Monoplacophora, Bivalvia, Polplacophora, Scaphopoda, Aplacophora y Cephalopoda. Date: 1 October 2011. Source: Own work. Author:
Veronidae.
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Type of Helicina nemoralis Guppy, 1866, in NHMUK collection, collected by R.H.L. Guppy in Trinidad.
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Summary[
edit] Description: English: Tellina magna Spengler, 1798 - great Caribbean tellin clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The great Caribbean tellin clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Tellinidae Locality: unrecorded/undisclosed/unspecified. Date: 4 January 2016, 12:01:24. Source:
https://www.flickr.com/photos/47445767@N05/24691320529/. Author: James St. John.
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Mollusc shells on a marine beach in Florida, USA (December 2012). Sanibel Island is one of dozens of barrier islands in the West-Central Florida Barrier Chain. This 191-mile long, slightly sinuous stretch of islands is located along the Gulf of Mexico coast of southern Florida. The southern-most island in the chain is Cape Romano Island. The northern-most islands are the Anclote Keys. Sanibel Island is located between Captiva Island and mainland Florida, just offshore from the towns of Fort Myers and Cape Coral, Florida. Much of Sanibel Island is developed, but significant tracts have been allowed to become wilderness - especially Ding Darling National Wildlife Refuge. Sanibel is on the southern side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. A tidal inlet occurs on the island's western side - Blind Pass (a man-made construct). To the east of Sanibel is a moderately broad waterway - San Carlos Pass. Sanibel Island and nearby Captiva Island, North Captiva Island, and Cayo Costa Island are Holocene barriers that rim the southern and western sides of a Late Miocene depression that is now Pine Island Sound. Middle Miocene limestone bedrock was subject to significant dissolution and karst/cave development. The Pine Island Sound area was a large karst depression in the Late Miocene. It is now filled with sediments - most of modern Pine Island Sound is significantly shallow. Sanibel is famous for its shell-rich marine beaches. The Sanibel Island area has the 3rd-richest seashell beaches on Earth and the # 1 richest shell beaches in the Western Hemisphere. Shell collecting is best after a storm. The beach shown above is Algiers Beach, which is part of Gulfside City Park on the southern shoreline of Sanibel Island. About 99% of the shells on Sanibel Island beaches are bivalves (clams). Relatively few snails (gastropods) are present, but they are more common and conspicuous after storm events. Other marine remains observed on these beaches include sea urchins (echinoids), starfish (asteroids), crabs (decapods), horseshoe crabs (xiphosurans), sponges (poriferans), stony corals (anthozoan cnidarians), sea squirts (tunicates), sea hares (anaspidean opisthobranch gastropods), worm tubes, fish & fish skeletons, and stingray barbs. Locality: Algiers Beach, southern shore of Sanibel Island, Gulf of Mexico coast of southwestern Florida, USA (vicinity of 26° 25' 27.64" North latitude, 82° 03' 56.17" West longitude) West-Central Florida Barrier Chain geologic info. synthesized from: Evans et al. (1985) - Bedrock controls on barrier island development: west-central Florida coast. Marine Geology 63: 263-283. Davis (1989) - Morphodynamics of the West-Central Florida barrier system: the delicate balance between wave- and tide-domination. Proceedings, Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap Symposium, 'Coastal Lowlands, Geology and Geotechnology', 1987: 225-235. Evans et al. (1989) - Quaternary stratigraphy of the Charlotte Harbor estuarine-lagoon system, southwest Florida: implications of the carbonate-siliciclastic transition. Marine Geology 88: 319-348.
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Summary[
edit] Description: English: Lopha cristagalli (Linnaeus, 1758) - cockscomb oyster (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The cockscomb oyster, Lopha cristagalli, is a distinctive bivalve that occurs in shallow marine reef environments of the Indian Basin and Pacific Basin. Fossil oysters assigned to Lopha are known starting in the Triassic. The cockscomb oyster is part of the Indo-West Pacific Province: "The world's largest and richest province extends from the Red Sea and East Africa across the Indian Ocean, then touches northern Australia and southern Japan to extend eastward throughout the "South Seas" to Hawaii and Easter Island. Probably 5,000 marine species are found in its shallow coral waters." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Ostreoida, Ostreidae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Cockscomb_oyster. Date: 3 January 2016, 16:23:38. Source:
https://www.flickr.com/photos/47445767@N05/24343756463/. Author: James St. John.
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Summary[
edit] Description: English: Tellina listeri Röding, 1798 - speckled tellin clam (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The speckled tellin clam shown above is part of the Caribbean Province: "The warm coral waters of the Caribbean stretching from northern Brazil to the Gulf of Mexico and northward adjacent to the Bahamas and Bermuda, contain a fauna of about 800 colorful species of common, shallow-water mollusks. The pink, or queen, conch and the sunrise tellin are typical." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Tellinidae Locality: unrecorded/undisclosed/unspecified. Date: 4 January 2016, 11:58:28. Source:
https://www.flickr.com/photos/47445767@N05/24432127893/. Author: James St. John.
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Summary[
edit] Description: Deutsch: Querschnitt von Byssusfasern. Date: 15 December 2011, 17:19:28. Source: Own work. Author:
Weserwasser.
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Mollusc shells on a marine beach near the southern tip of Cayo Costa Island, Florida, USA (March 2014). Cayo Costa Island is one of dozens of barrier islands in the West-Central Florida Barrier Chain. This 191-mile long, slightly sinuous stretch of islands is located along the Gulf of Mexico coast of southern Florida. The southern-most island in the chain is Cape Romano Island. The northern-most islands are the Anclote Keys. Cayo Costa Island is located between North Captiva Island and Gasparilla Island, offshore from the towns of Fort Myers and Cape Coral, Florida. Most of Cayo Costa Island is a state park and is only accessible by boat. Cayo Costa is on the western side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. Two large tidal inlets border Cayo Costa Island - Captiva Pass to the south and Boca Grande Pass to the north. Cayo Costa is a classic example of a drumstick barrier island - it is wide on its northern end and tapers to a point or hook on its southern end. This shape is the result of long-shore currents along the coastline. Other islands in the barrier chain also have this morphology. Cayo Costa Island and nearby North Captiva Island, Captiva Island, and Sanibel Island are Holocene barriers that rim the western and southern sides of a Late Miocene depression that is now Pine Island Sound. Middle Miocene limestone bedrock was subject to significant dissolution and karst/cave development. The Pine Island Sound area was a large karst depression in the Late Miocene. It is now filled with sediments - most of modern Pine Island Sound is significantly shallow. The beaches of Cayo Costa Island are famous for having an abundance of shells - they form moderately thick piles along much of the island's shoreline. The relative abundance and quality of shells varies from site to site and with weather & seasonal conditions. The shell deposits are dominated by bivalves. West-Central Florida Barrier Chain geologic info. synthesized from: Evans et al. (1985) - Bedrock controls on barrier island development: west-central Florida coast. Marine Geology 63: 263-283. Davis (1989) - Morphodynamics of the West-Central Florida barrier system: the delicate balance between wave- and tide-domination. Proceedings, Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap Symposium, 'Coastal Lowlands, Geology and Geotechnology', 1987: 225-235. Evans et al. (1989) - Quaternary stratigraphy of the Charlotte Harbor estuarine-lagoon system, southwest Florida: implications of the carbonate-siliciclastic transition. Marine Geology 88: 319-348.
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Atrina pen shell bivalves on a marine beach in Florida, USA (December 2012). Sanibel Island is one of dozens of barrier islands in the West-Central Florida Barrier Chain. This 191-mile long, slightly sinuous stretch of islands is located along the Gulf of Mexico coast of southern Florida. The southern-most island in the chain is Cape Romano Island. The northern-most islands are the Anclote Keys. Sanibel Island is located between Captiva Island and mainland Florida, just offshore from the towns of Fort Myers and Cape Coral, Florida. Much of Sanibel Island is developed, but significant tracts have been allowed to become wilderness - especially Ding Darling National Wildlife Refuge. Sanibel is on the southern side of Pine Island Sound, a large lagoon just south of Charlotte Harbor. A tidal inlet occurs on the island's western side - Blind Pass (a man-made construct). To the east of Sanibel is a moderately broad waterway - San Carlos Pass. Sanibel Island and nearby Captiva Island, North Captiva Island, and Cayo Costa Island are Holocene barriers that rim the southern and western sides of a Late Miocene depression that is now Pine Island Sound. Middle Miocene limestone bedrock was subject to significant dissolution and karst/cave development. The Pine Island Sound area was a large karst depression in the Late Miocene. It is now filled with sediments - most of modern Pine Island Sound is significantly shallow. Sanibel is famous for its shell-rich marine beaches. The Sanibel Island area has the 3rd-richest seashell beaches on Earth and the # 1 richest shell beaches in the Western Hemisphere. Shell collecting is best after a storm. The beach shown above is Algiers Beach, which is part of Gulfside City Park on the southern shoreline of Sanibel Island. About 99% of the shells on Sanibel Island beaches are bivalves (clams). Relatively few snails (gastropods) are present, but they are more common and conspicuous after storm events. Other marine remains observed on these beaches include sea urchins (echinoids), starfish (asteroids), crabs (decapods), horseshoe crabs (xiphosurans), sponges (poriferans), stony corals (anthozoan cnidarians), sea squirts (tunicates), sea hares (anaspidean opisthobranch gastropods), worm tubes, fish & fish skeletons, and stingray barbs. The dark-colored shells shown above are Atrina pen shells, which are distinctive bivalves having thin, brittle, brownish-colored shells. Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Pterioida, Pinnidae Locality: Algiers Beach, southern shore of Sanibel Island, Gulf of Mexico coast of southwestern Florida, USA (vicinity of 26° 25' 27.64" North latitude, 82° 03' 56.17" West longitude) West-Central Florida Barrier Chain geologic info. synthesized from: Evans et al. (1985) - Bedrock controls on barrier island development: west-central Florida coast. Marine Geology 63: 263-283. Davis (1989) - Morphodynamics of the West-Central Florida barrier system: the delicate balance between wave- and tide-domination. Proceedings, Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap Symposium, 'Coastal Lowlands, Geology and Geotechnology', 1987: 225-235. Evans et al. (1989) - Quaternary stratigraphy of the Charlotte Harbor estuarine-lagoon system, southwest Florida: implications of the carbonate-siliciclastic transition. Marine Geology 88: 319-348.
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Summary[
edit] Description: English: Lopha cristagalli (Linnaeus, 1758) - cockscomb oyster (public display, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. The cockscomb oyster, Lopha cristagalli, is a distinctive bivalve that occurs in shallow marine reef environments of the Indian Basin and Pacific Basin. Fossil oysters assigned to Lopha are known starting in the Triassic. The cockscomb oyster is part of the Indo-West Pacific Province: "The world's largest and richest province extends from the Red Sea and East Africa across the Indian Ocean, then touches northern Australia and southern Japan to extend eastward throughout the "South Seas" to Hawaii and Easter Island. Probably 5,000 marine species are found in its shallow coral waters." [info. from museum signage] Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Ostreoida, Ostreidae Locality: unrecorded/undisclosed/unspecified More info. at: en.wikipedia.org/wiki/Cockscomb_oyster. Date: 3 January 2016, 16:23:48. Source:
https://www.flickr.com/photos/47445767@N05/24944288576/. Author: James St. John.