Piddock (Pholadidea sp.) By: General Biological Supply House, Inc. From: The Science of Zoology 1966

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Piddock (Pholadidea sp.) By: General Biological Supply House, Inc. From: The Science of Zoology 1966

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#2497 - Pholadidea sp. - Piddock
AKA Angelwings.
As the sign under the fossil says, not every shell in the cliffs along the fossil coast are actually fossils, although some have certainly been there a good while, because they dug their way into the soft rock before the entire area got pushed back up above sealevel.
Pholadidea and the other genera in the family twist their shells back and forth to excavate tubular burrows in clay, peat or soft rock. Despite the hard work involved, the shells are actually quite fragile, and difficult to collect intact. Pholas dactylus, the common piddock, can not only manage the same trick in harder rock, but is also bioluminescent.
Whanganui Regional Museum, New Zealand
beach stuff
Pleistocene piddock bore holes
Monterey formation shale from Farm Center, Carmel Valley, CA
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Pleistocene rock with piddock (boring clam) holes
Carmel Valley, California

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#2801 - Parapholas californica - Scaleside Piddock
AKA Parapholas janellii, Pholas californica, and Pholas janellii.
A rock-boring clam found in shale, mudstone, chert and hard sand along the Pacific coast of North America. They line the tunnel with a chimney made of small rock fragments glued together with calcium carbonate, and the chimney may protrude a short way into the water column.
Otago Museum, Dunedin, Aotearoa New Zealand
Common piddock (Pholas dactylus) By: Hervé Chaumeton From: The Complete Encyclopedia of the Animal World 1980
Piddock (Pholadidae family)