Belongs within: Pectinoidea. Cyclopecten is a genus of deep-sea scallops with a minute, thin, rounded shell. <==Cyclopecten Verrill 1897F27 | i. s.: C. alaskenis (Dall 1872)W84 | C. culebrensis (Smith 1885)W84 | C. exquisitus Grau 1959PP78 | C. favusF27 | C. imbrifer [=Pecten imbrifer]D56 | C. nanus Verrill & Bush 1897W84 | C. obliquusF27 |… Continue reading Cyclopecten


Belongs within: Pectinidae. Mimachlamys is a genus of medium-sized to large scallops, with highly unequal auricles and both primary and secondary spinous radial macrosculpture, that live byssally attached to rocks or coral. Mimachlamys Iredale 1929P61 |–*M. asperrima (Lamarck 1819)P61, MG-H11 [=Chlamys (*Mimachlamys) asperrimaP61] |–M. celator (Finlay 1928) [=Chlamys (Mimachlamys) celator]P61 |–M. cloacata (Reeve 1853)WBS-S15 |–M.… Continue reading Mimachlamys


Belongs within: Pectinida. The Limidae, file shells, are a group of bivalves with an ovate to subtrigonal shell that commonly live attached in fissures by byssal threads, though some species are able swimmers by flapping the valves. <==Limidae |–Ctenostreon pectiniformisJB12, F71 |–Gemellima Iredale 1929D56 |–Isolima Iredale 1929D56 |–Ctenoides Morch 1853D56 | |–C. ales (Finlay 1927WBS-S15… Continue reading Limidae


Belongs within: Pectinida. Buchia is a genus of mussel-like bivalves known from the Middle Jurassic to the Lower Cretaceous (Cox et al. 1969). Characters (from Cox et al. 1969): Strongly prosocline, height well exceeding length; highly inequivalve, left valve strongly convex with more or less prominently projecting umbo and prosogyrous beak, right valve flat to… Continue reading Buchia


Belongs within: Pterioida. Inoceramus is a diverse genus of pteriomorph molluscs known from the Jurassic and Cretaceous periods. Characters (from Cox et al. 1969): Subequivalve to strongly inequivalve, ovate, trapeziform or suborbicular; posterior wing variably developed; ligamental area concave transversely; radial ornament rarely present; outer ostracum occasionally very thick. <==Inoceramus Smith 1816B59 |–I. involutus [=*I.… Continue reading Inoceramus


Belongs within: Limopsoidea. Glycymeris, the dog-cockles, are a group of bivalves found lying unattached on the substrate in shallow seabeds. They have a subcircular to subquadrate shell with a smooth or costate surface and internally fluted ventral margins. <==Glycymeris da Costa 1778 [Glycymeridinae]DK10 |–G. (Glycymeris)KS02 | |–*G. (G.) orbicularis (da Costa 1778) [=Arca orbicularis]KS02 |… Continue reading Glycymeris


Belongs within: Pectinida. Deltopecten is a genus of scallops known from the Late Permian of Australia (Cox et al. 1969). Characters (from Cox et al. 1969): Large, orbicular, radially plicate shells with or without fine costae; ligament area striated more or less parallel to hinge axis, resilifers lacking. <==Deltopecten Etheridge 1892DX84 |–D. clarkei Fletcher 1929F71… Continue reading Deltopecten


Belongs within: Aviculopectinoidea. Aviculopecten is a genus of scallops known from the Carboniferous and Permian (Cox et al. 1969). Characters (from Cox et al. 1969): Ornamentation radial, increasing on body of shell by intercalation in left valve, by bifurcation in right valve; right valve commonly smaller than left. Aviculopecten McCoy 1852W77 |–A. affinis de Koninck… Continue reading Aviculopecten


Belongs within: Pteriomorphia. Daonella was a genus of exceedingly flat scallops found worldwide during the Triassic. Triassic, glorious Triassic Published 8 February 2011 The Halobiidae were a family of bivalves that first made their appearance in the lower Middle Triassic (mid-Anisian, for those who are, unlike yours truly, conversant with such things). They were a… Continue reading Daonella


Belongs within: Pteriomorphia. Halobia was a genus of flat clams found worldwide during the Middle and Upper Triassic. Several species are useful index fossils for determining formation ages. Characters (from Cox et al. 1969): Semicircular or ovate, with long hinge margin; rarely appreciably oblique; anterior wing clearly delimited on each valve, commonly by groove; ornament… Continue reading Halobia