Pholadidea
''Pholadidea'' is a taxonomic genus of marine (ocean), marine bivalve molluscs in the subfamily Martesiinae of the family Pholadidae (the piddocks). Most members of ''Pholididea'' bore into shale, soft rock and coral for shelter, with the exception of ''Pholididea (Hatasia) wiffenae'', which is a wood-borer. Appearance The ''Pholididea'' are distinguished from the other genera in Martesiinae by having only on Umbo (bivalve), umbonal-ventral Sulcus (morphology), sulcus, a longitudinally-divided mesoplax, and either no metaplax and hypoplax, or a single plate caused by deposition of calcite in the periostratum. Occurrence ''Pholididea'' is known from the Eocene to the Holocene, while the subgenus ''P. (Hatasia)'' is known only from the Holocene. Species have been reported from the Palaeocene and Late Cretaceous, but these likely belong in other genera. Taxonomy The following taxonomic classifications exist in ''Pholididea'': Subgenera * ''Pholadidea (Pholadidea)'' William Turto ...
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