| Plagiostoma | |
|---|---|
 | |
| A fossil cast of Plagiostoma giganteum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Limida |
| Family: | Limidae |
| Genus: | † Plagiostoma Sowerby, 1814 |
Plagiostoma is a genus of fossil saltwater clams, marine bivalve mollusks in the family Limidae, the file clams.
This cosmopolitan genus occurs in Mid Triassic to Upper Cretaceous strata (from 295.0 to 66.043 Ma.) [1]
These bivalves are epifaunal byssate suspension feeders of up to 12 cm in size. The shells are obliquely ovate, moderately inflated, with obtuse posterior and smaller anterior wings.
Plagiostoma giganteum is a well-known fossil bivalve which occurs in the Blue Lias formation in various parts of the United Kingdom, [2] although it is geographically widespread and has also been found in the Triassic of the United Kingdom. [3]
Venus is a genus of small to large saltwater clams in the family Veneridae, which is sometimes known as the Venus clams and their relatives. These are marine bivalve molluscs.
Trigoniidae is a taxonomic family of saltwater clams, marine bivalve mollusks in the superfamily Trigonioidea. There is only one living genus, Neotrigonia, but in the geological past this family was well represented, widespread and common. The shells of species in this family are morphologically unusual, with very elaborate hinge teeth, and the exterior of the shell is highly ornamented.
Inoceramus is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous.
Barbatia is a genus of "bearded" ark clams, marine bivalve mollusks in the family Arcidae, the ark clams.
Anadara is a genus of saltwater bivalves, ark clams, in the family Arcidae. It is also called Scapharca.
Panopea is a genus of large marine bivalve molluscs or clams in the family Hiatellidae. There are 10 described species in Panopea. Many of them are known under the common name "geoduck".
Pycnodonte is a genus of extinct oysters, fossil marine bivalve mollusks in the family Gryphaeidae, the foam oysters or honeycomb oysters. Shells of species in this genus are found around the world in fossil shell beds from the Valanginian to the Early Pleistocene. They are a commonly found fossil in Cretaceous shellbeds of the Navesink Formation in New Jersey.
The Inoceramidae are an extinct family of bivalves ("clams") in the Class Mollusca. Fossils of inoceramids are found in marine sediments of Permian to latest Cretaceous in age. Inoceramids tended to live in upper bathyal and neritic environments.
Periglypta is a genus of bivalves in the family Veneridae.
Bakevelliidae is an extinct family of prehistoric bivalves that lived from the Late Mississippian until the Middle Eocene. Bakevelliidae species are found worldwide, excluding Antarctica. Living a stationary life attached to substrate in marine and brackish environments, they formed shells of an aragonite composition with a low amount of magnesium calcite. The family was named by King in 1850. At least one genus in the family, Hoernesia, has a notably twisted commissure join.
Avalonnectes is an extinct genus of small-bodied rhomaleosaurid known from the Early Jurassic period of the United Kingdom. It contains a single species, A. arturi.
Stratesaurus is an extinct genus of small-bodied rhomaleosaurid plesiosaur known from the Early Jurassic period of the United Kingdom. It contains a single species, S. taylori.
Eoplesiosaurus is an extinct genus of basal plesiosauroid known from the Early Jurassic period of the United Kingdom. It contains a single species, E. antiquior.
Pholadomya is a genus of saltwater clams, marine bivalve molluscs in the family Pholadomyidae.
Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae. The fossil range of the genus spans the Paleozoic, Mesozoic and Paleocene of the Cenozoic, from 298 to 56 Ma.
Actinoceramus is an extinct genus of fossil saltwater clams, marine pteriomorphian bivalve molluscs. These bivalves were facultatively mobile infaunal suspension feeders.
The Sunrise Formation is a geologic formation in Nevada. It preserves fossils dating back to the Hettangian to Sinemurian stages of the Early Jurassic period.
The Lilstock Formation is a geologic formation in England. It preserves bivalve, insect and other invertebrate fossils, as well as fossil fish of Agkistracanthus mitgelensis and the basal theropod dinosaur "Zanclodon" cambrensis dating back to the Rhaetian of the Triassic period.
Paphia is a genus of saltwater clam, a marine bivalve mollusk in the family Veneridae, the Venus clams.
Fossil Beach, in Sedbury, Gloucestershire, is beneath the Sedbury Cliffs by the River Severn and is known as a rich source of easily discovered fossils. It is a Site of Special Scientific Interest (SSSI).
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