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"These are valves of the Ponderous ark, so-called because the shell is surprisingly thick and very heavy. When the valves are fresh they are covered in thick dark periostracum. Valves of this species are very common in the beach drift and they are very durable, hard to break, but the most common ark shell on Sanibel is a smaller, more rectangular species called the Transverse ark. When a valve of the Ponderous ark is really fresh, the tip of its ""nose"" is pink, like a human who caught a little too much sun."
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Along with Transverse Ark, this was the most abundant, conspicuous, dominant component of tidal drift piles of shells. After the first day of shelling, it was just a matter of searching through all of the arks for anything else. I'll be scouring my cache of arks to see if I overlooked some of the other less numerous species.
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Along with Transverse Ark, this was the most abundant, conspicuous, dominant component of tidal drift piles of shells. After the first day of shelling, it was just a matter of searching through all of the arks for anything else. I'll be scouring my cache of arks to see if I overlooked some of the other less numerous species.
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Along with Transverse Ark, this was the most abundant, conspicuous, dominant component of tidal drift piles of shells. After the first day of shelling, it was just a matter of searching through all of the arks for anything else. I'll be scouring my cache of arks to see if I overlooked some of the other less numerous species.
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"A close examination of a few of these specimens (with a hand lens) indicated that they have very fine concentric ""threads"" between the ribs, clinching the ID. These were the only numerous shell at the end of the road at Boca Chica Blvd."
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"A close examination of a few of these specimens (with a hand lens) indicated that they have very fine concentric ""threads"" between the ribs, clinching the ID. These were the only numerous shell at the end of the road at Boca Chica Blvd."
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"A close examination of a few of these specimens (with a hand lens) indicated that they have very fine concentric ""threads"" between the ribs, clinching the ID. These were the only numerous shell at the end of the road at Boca Chica Blvd."
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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
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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
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Cameron County, Texas, US
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Canaveral Nat'l Seashore
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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
