Periglypta

Belongs within: Venerinae. Periglypta is a genus of venerid bivalves that first appeared in the Oligocene (Cox et al. 1969). Characters (from Cox et al. 1969): Quadrate, heavy, pallial sinus rounded; sculpture cancellate. Periglypta Jukes-Brown 1914KS02 [=Cytherea Lamarck 1809 (preoc.)M27, G79] |–*P. puerpera (Linnaeus 1771)DK10 [=Venus puerperaKS02, *Cytherea puerperaM27] |–‘Cytherea’ albida [incl. C. affinis]G79 |–‘Venus’… Continue reading Periglypta

Dosinia

Belongs within: Veneridae. Dosinia is a large genus of infaunal bivalves found worldwide. The first members of the genus are known from the Palaeocene of New Zealand with representatives not found in Europe and North America until the Miocene (Marwick 1927). Characters (from Cox et al. 1969): Equivalve, compressed, nearly orbicular, concentrically striate; lunule well… Continue reading Dosinia

Paphia

Belongs within: Veneridae. Paphia is a genus of bivalves that first appeared in the Oligocene, and is found primarily in the Pacific region, extending to Europe (Cox et al. 1969). The subgenus Callistotapes has the cardinal teeth of the hinge more divergent than in the type, with the left posterior cardinal much closer to the… Continue reading Paphia

Cardiidae

Belongs within: Heterodonta.Contains: Protocardiinae, Trachycardium (Acrosterigma), Laevicardium, Orthocardiinae, Cardiinae, Tridacninae, Fraginae. The Cardiidae are a family of heterodont bivalves that first appeared in the Late Triassic. As well as the cockles that have generally been assigned to this family, it also includes the giant clams (Tridacninae) that were previously treated as a separate family. Both… Continue reading Cardiidae

Lasaeidae

Belongs within: Heterodonta.Contains: Galeommatidae. The Lasaeidae, kelly clams, are a group of small bivalves with generally thin shells. They live attached to a substrate by a byssus. Within the family, members of the genus Kellia are relatively large, up to about 15 mm in diameter, with a globose, smooth and shining shell. The kellyclams Published… Continue reading Lasaeidae

Lucinidae

Belongs within: Heterodonta.Contains: Leucosphaerinae, Pegophyseminae, Myrteinae, Codakiinae, Lucininae. The Lucinidae are a family of cockle-like bivalves most noted for their symbiotic association with chemosynthetic bacteria that live within their gill filaments. They have a fossil record extending back to the Silurian but did not diversify until during the Mesozoic. Modern species are most diverse in… Continue reading Lucinidae

Galeommatidae

Belongs within: Lasaeidae. The Galeommatidae are a family of small bivalves in which the shell may be completely enclosed by the expanded mantle. The shell itself is often reduced with the valves transverse, irregular and/or gaping. A number of galeommatids live as commensals in the burrows of invertebrates such as echinoderms or crustaceans. The Leptonidae… Continue reading Galeommatidae

Psammobia

Belongs within: Tellinoidea. Treated by Willan (1993) as a subgenus of Gari (the sunset shells), Psammobia is a cosmopolitan assemblage of tellinoid bivalves. Characters (from Willan 1993): Moderate-sized psammobiids with thin to moderately thick shells; inequilateral, umbones displaced anteriorly; inequivalve with right valve more convex; posterior ridge usually distinct on right valve at least. Valves… Continue reading Psammobia

Gafrarium

Belongs within: Veneridae. Gafrarium is a genus of venerid bivalves with its highest diversity in the Indo-Pacific. Characters (from Gardner 1947): Shell rather small but heavy, transversely oval or subtrigonal, equivalve, subequilateral. Umbones low, not conspicuous. External sculpture concentric, radial or reticulate. Lunule and escutcheon fairly well differentiated. Ligament external, seated on a nymph. Hinge… Continue reading Gafrarium