Belongs within: Mytilidae. Mytilus is a cosmopolitan genus of mussels bearing an elongate, wedge-shaped shell with a terminal beak. Species are commonly exploited for food, such as the blue mussel M. edulis and the California mussel M. californianus. <==Mytilus Linnaeus 1758P61 |–*M. edulis Linnaeus 1758P61 (see below for synonymy) | |–M. e. edulisP61 | |–M.… Continue reading Mytilus


Belongs within: Pteriomorphia.Contains: Brachidontes, Musculus, Modiolaria, Modiolus, Perna, Lithophaga, Mytilus, Crenella. The Mytilidae are the mussels, a family of originally epifaunal, byssally-attached bivalves. Identifiable examples of this family are known in the fossil record from the Devonian (Skelton & Benton 1993). Free-living species are commonly nestling, forming distinct colonies. The beak of the shell is at… Continue reading Mytilidae


Belongs within: Pterioida.Contains: Pteria. The Pterioidea are a group of byssally-attached bivalves with unequal valves, the left valve generally being distinctly more inflated than the right (Cox et al. 1969). Members of the Pteriidae, the feather oysters, usually have a characteristic triangular projection on either side of the straight hinge-line. The Isognomonidae commonly possess the… Continue reading Pterioidea


Belongs within: Pteriomorphia.Contains: Ambonychioidea, Inoceramus, Platyceramus, Mytiloides, Pterineidae, Pinnidae, Pterioidea, Ostreoidea, Plicatuloidea. The Pterioida are a clade of three major lineages of living bivalves, the Pinnidae, Pterioidea and Ostreoidea, supported as a monophylum by molecular analyses (Giribet & Wheeler 2002). Members of the clade tend to have elongate shells, equivalve in Pinnidae but inaequivalve in… Continue reading Pterioida


Belongs within: Ostreoidea.Contains: Ostrea. The Ostreinae are a group of oysters that first appeared in the Lower Cretaceous. A number of modern species are economically significant. Crassostrea and Saccostrea species eject eggs into the water column to be fertilised and develop externally. Saccostrea species differ from Crassostrea in the presence of a deeper umbonal cavity.… Continue reading Ostreinae


Belongs within: Aviculopectinoidea.Contains: Pterinopectinidae, Entolioididae, Entoliidae, Pectinidae, Cyclopecten. The Pectinoidea, scallops, are a group of bivalves that first appeared in the Ordovician. Members of the group are distinguished by the development of dorsolateral expansions of the shell, the auricles, on either side of the hinge. Many scallops are attached to their substrate by a byssus,… Continue reading Pectinoidea


Belongs within: Pteriomorphia.Contains: Deltopecten, Pseudomonotidae, Monotidae, Buchia, Aviculopectinoidea, Limidae, Placunopsis, Anomia. The Pectinida are a clade of bivalves supported by molecular data, combining the living taxa Pectinoidea, Limoidea and Anomiidae. The Anomiidae, golden oysters, are a family of generally sessile bivalves that are first definitely known from the Jurassic (Todd & Palmer 2002). Anomiids usually… Continue reading Pectinida


Belongs within: Pectinidae. Pecten is a genus of scallops that is first known from the Upper Eocene. The valves of the shell are distinctly unequal, with the right valve being strongly convex and the left valve only slightly convex, flat or concave. Radial ribs are well developed with those on the more convex right valve… Continue reading Pecten


Belongs within: Bivalvia.Contains: Hippuritacea, Neomiodontidae, Gastrochaenidae, Montacutidae, Lasaeidae, Sportellidae, Thyasira, Lucinidae, Solenoidea, Tellinoidea, Neoheterodontei, Cardiidae, Panopea. The Heterodonta are one of the major living clades of bivalves, with their earliest representatives appearing in the Ordovician. In the past, the living members of the clade were divided between the orders Veneroida and Myoida (the latter including… Continue reading Heterodonta


Belongs within: Heterodonta.Contains: Psammobia, Gari, Donax, Iphigenia, Galatea, Solecurtidae, Macoma, Semele, Tellina, Arcopagia, Angulus, Strigilla. The Tellinoidea are a group of infaunal bivalves that first appeared in the Upper Triassic. With their elongate, mobile siphons, tellinoids tend to burrow relatively deep within the sediment, using the siphons to pick up food particles from the sediment… Continue reading Tellinoidea