''Circomphalus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of saltwater clams,

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

molluscs in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Veneridae, the venus clams.

Fossil records

The genus ''Circomphalus'' is known from the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

to the

Recent The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together ...

periods (age range: from 15.97 to 0.0 million years ago).

Species

Species within this genus, according to ITIS, include: * '' Circomphalus callimorphus'' (Dall, 1902) * '' Circomphalus casina'' (Linnaeus, 1758) * '' Circomphalus fordi'' (Yates, 1890) * '' Circomphalus strigillinus'' (Dall, 1902) According to the

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...

, the species are:WoRMS
/ref> * '' Circomphalus disjectus'' (Perry, 1811) * ''

Circomphalus foliaceolamellosus ''Circomphalus foliaceolamellosus'' is a species of saltwater clam, a marine bivalve mollusc in the family Veneridae, the venus clams. Right and left valve of the same specimen: File:Circomphalus foliaceolamellosus 01.jpg, Right valve File:C ...

'' (Dillwyn, 1817) * ''

Circomphalus hiraseanus ''Circomphalus'' is a genus of saltwater clams, marine bivalve molluscs in the family Veneridae, the venus clams. Fossil records The genus ''Circomphalus'' is known from the Miocene to the Recent periods (age range: from 15.97 to 0.0 million y ...

'' (Kuroda, 1930) * ''

Circomphalus yatei ''Circomphalus'' is a genus of saltwater clams, marine (ocean), marine bivalve molluscs in the family (biology), family Veneridae, the venus clams. Fossil records The genus ''Circomphalus'' is known from the Miocene to the Holocene, Recent perio ...

'' (Gray, 1835)

References

{{Taxonbar, from=Q3802488 Veneridae Bivalve genera