Pseudamussium clavatum (Poli, 1795) |
British Isles to Canarias, Mediterranean. Sublittoral to continental shelf ans slope. Original taxon: Ostrea clavata. Synonym: Ostrea inflexa Poli. A specimen from Sicily. 19mm. |
Subadult (no crenulate margins). Trawled off Chioggia, Venezia, NE. Italy. 26mm. |
« Ostrea inflexa: concha ovato-rotundata, ventricosa, striis muricatis undique obsita. Valvae it plurimum inaequales. Utraque radios habet quinos, interdum quaternos, teretes, elatos, clavaeque formam referentes, qui porro as testae ambitum non pertingunt. Ambitus iste in utraque valva ea ratione inflectitur, ut concha pyxidis formam imitari videatur. Margo tenuiter crenulatus. Auriculae minimae, inaequales; cardo rectus. Valvae discolores; altera roseo, vel miniaceo colore umbuitur, altera niveo candore coruscat. » – G. Poli: Testacea utriusque siciliae… vol. II, Parma 1795, via BHL. Above and below: pattern variation. Málaga, Andalucia, S. Spain. 16-18mm. |
A very variable species. Many forms were described. |
« Ostrea clavata: concha ovato-rotundata, inaequivalvis, aequilatera, ventricosa, glabra. Valvae radiis quinis teretibus, elatis, laevibus clavae formam ad apicem anteriorem referentibus, obsitae sunt, qui ad conchae ambitum aegre pertingunt. Valva altera gibbosior est, in ambitu leviter crenata. Auriculae pene aequales, minimae; cardo rectus. Valvae discolores: altera miniacea punctis albicantibus conspersa; altera nivea. » – op. cit. Heavy and box-shaped: this is the form dumasii Payraudeau. 100-130m deep, off Civitavecchia, Lazio, W. Italy. 34mm. |
Pecten inflexus in C. H. Küster: “Die Gattungen Spondylus und Pecten”, Systematisches Conchylien-Cabinet Bd.7:Abt.2, Nürnberg 1888, via BHL. « Pecten inflexus: testa trigono-orbicularis, solidula, inaequivalvis, aeequilatera, valvis subtilissime granuloso-striatis, ad marginem striato-sulcatis; sinistra concavo depressa, costis quinque compressis radiata, aurantio rufescente, maculis puuctisque pallidis lentiginosa, interdum albida purpureo-maculata; valva dextra convexa, alba, costis quinque latis, obtusis; margine inflexo, crenulato; auriculis inaequalibus, parvis. » – op. cit. p. 123. |
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