Pododesmus patelliformis (Linnaeus, 1761)
Anomioidea : Anomiidae
To size: To 40mm. Shell Structure: Upper valve thin but not fragile; lower valve very thin, hyaline. Equivalve: Inequivalve, upper (left) valve convex; lower (right valve) flat. Equilateral: Inequilateral, beaks close to the middle of the dorsal margin. Outline: Upper valve subcircular, but irregular, conforming to attachment surface; lower valve as upper but with a large oval byssus aperture.
Sculpture: Upper valve densely wrinkled with a variable number (20-60) of weak radial riblets, these irregular and often interrupted; lower valve with growth lines only. Margin: Irregular but smooth. Ligament: In a half moon shaped pit beneath the beaks. Hinge: Obscure, some with traces of a median crural ridge directly above the ligament. Pallial Musculature: Upper valve with two distinct scars the dorsal (byssus retractor) much larger and separated (patelliformis state) from the smaller single adductor scar; often scars coalesce (squama state). Scars with faint radiating furrows. Lower valve with a single faint adductor scar. Periostracum: Obscure. Colour: Upper valve pale tan to brown, some showing green through the central area and with brown between the ribs on the margins; often obscured by attached epifauna, internally the central area tinged green to yellow green. Lower valve white, semitransparent. Additional Characters: Anatomy: Ctendium with reflected filaments.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Key Features & Similar Species
Anomioidea : Anomiidae
Listed are literature citing Pododesmus patelliformis (Linnaeus, 1761). Reference containing the species Type Description is highlighted.
Linnaeus C 1761. Fauna Svecica sistens animalia Sveciæ Regni: mammalia, aves, amphibia, pisces, insecta, vermes. natalium, descriptionibus insectorum. Editio altera, auctior. - natalium, descriptionibus insectorum. Editio altera, auctior–- Stockholmiæ, Laurentii Salvii. 578pp, 1pl.
Winckworth, R I922. Note on the British species of Anomia. Proceedings of the Malacological Society of London. 15: 32-34.
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