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These are valves of Anadara transversa, the Transverse ark. These are rather poor quality specimens, not fresh but knocked about and damaged, however, this was part of a quantitate study. I was counting the number of valves of each species in a standard sized volume of beach drift. Anadara transversa turned out to be the most common species in the samples that I took, which contained almost no micromollusks.
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This species is often found inside empty clam shells; often right at the hinge. Collected via scallop dredge.
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This species is often found inside empty clam shells; often right at the hinge. Collected via scallop dredge.
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"If I'm identifying these correctly, this was by far the most abundant small ark shell--the most abundant shell in fact--on most of the beaches we visited. Literally millions of them could be seen in the high tide drift lines at any beach. The process of shelling was often just scanning, sorting, and sifting through masses of these to look for other species. See, for example, this earlier upload of a typical beach scene: http://www.inaturalist.org/observations/2277245 These typically ranged in size from 3/4"" to 1"" in length. I'm still working through our collection of ark shells here at home, hoping I might discover one or more additional ark species for our list."
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"If I'm identifying these correctly, this was by far the most abundant small ark shell--the most abundant shell in fact--on most of the beaches we visited. Literally millions of them could be seen in the high tide drift lines at any beach. The process of shelling was often just scanning, sorting, and sifting through masses of these to look for other species. See, for example, this earlier upload of a typical beach scene: http://www.inaturalist.org/observations/2277245 These typically ranged in size from 3/4"" to 1"" in length. I'm still working through our collection of ark shells here at home, hoping I might discover one or more additional ark species for our list."
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"If I'm identifying these correctly, this was by far the most abundant small ark shell--the most abundant shell in fact--on most of the beaches we visited. Literally millions of them could be seen in the high tide drift lines at any beach. The process of shelling was often just scanning, sorting, and sifting through masses of these to look for other species. See, for example, this earlier upload of a typical beach scene: http://www.inaturalist.org/observations/2277245 These typically ranged in size from 3/4"" to 1"" in length. I'm still working through our collection of ark shells here at home, hoping I might discover one or more additional ark species for our list."
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This small clam (18 x 12 mm) may be in the ark order (Arcoidea in an older reference) based on the slightly curved hinge without strong teeth. It appears to be slightly to heavily worn so I can't tell if it has only low radial ribs or if heavier ribbing was worn off. I may be off completely; this may be an unidentifiable shell.
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This small clam (18 x 12 mm) may be in the ark order (Arcoidea in an older reference) based on the slightly curved hinge without strong teeth. It appears to be slightly to heavily worn so I can't tell if it has only low radial ribs or if heavier ribbing was worn off. I may be off completely; this may be an unidentifiable shell.
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This small clam (18 x 12 mm) may be in the ark order (Arcoidea in an older reference) based on the slightly curved hinge without strong teeth. It appears to be slightly to heavily worn so I can't tell if it has only low radial ribs or if heavier ribbing was worn off. I may be off completely; this may be an unidentifiable shell.
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bottom two specimens are Anadara transversa.
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Galveston County, Texas, US
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Galveston County, Texas, US
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Cameron County, Texas, US
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Cameron County, Texas, US
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Cameron County, Texas, US
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Cameron County, Texas, US