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The taxonomic term Bivalvia was first used by Linnaeus in the 10th edition of his Systema Naturae in 1758 to refer to animals having shells composed of two valves. [3] More recently, the class was known as Pelecypoda, meaning "axe-foot" (based on the shape of the foot of the animal when extended).
The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks. This family of bivalves is very well represented in the fossil record, however the number of living species is very few. All species have shells cemented to a substrate.
In 2010 a new proposed classification system for the Bivalvia was published by Bieler, Carter & Coan revising the classification of the Bivalvia, including the subclass Pteriomorphia. [8] However, the following taxonomy represents the current accepted arrangement of this subclass according to the World Register of Marine Species [ 9 ]
Gryphaea, one of the genera known as devil's toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae. These fossils range from the Triassic period to the middle Paleogene period [citation needed], but are mostly restricted to the Triassic and Jurassic. They are particularly common in many parts of Britain.
Tridacna is a genus of large saltwater clams, marine bivalve molluscs in the subfamily Tridacninae, the giant clams.Many Tridacna species are threatened. They have heavy shells, fluted with 4 to 6 folds.
Protobranchia is a subclass of bivalve molluscs. [1] It contains the extant orders Nuculanida, Nuculida, and Solemyida.. These are deep water clams of a small and primitive order with a taxodont hinge (composed of many similar, small teeth), generally with a central ligament pit, large labial palps which are used in deposit feeding and the gills used only for respiration, the anterior and ...
The Limidae or file shells are members of the only family of bivalve molluscs in the order Limida. [1] The family includes 130 living species, assigned to 10 genera.Widely distributed in all seas from shallow to deep waters, the species are usually epifaunal or nestling, with many species building byssal nests for protection.
Pectinida is a taxonomic order of large and medium-sized saltwater clams, marine bivalve molluscs, commonly known as scallops and their allies. [1] It is believed that they began evolutionarily in the late Middle Ordovician epoch; many species, of course, are still extant.