''Camya'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

of early bivalve and is the only genus in the extinct family Camyidae. The genus is known solely from early Middle Cambrian fossils found in Europe. The genus currently contains a solitary accepted species, ''Camya asy''.

Description

''Camya asy'' is a small bivalve which was first described in 1995 by Ingelore Hinz-Schallreuter. The genus and species are based on the fossils of two juvenile specimens which are both incomplete due to only the left

valve A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fitting ...

of each being recovered. The fossils were found in sediments of the middle Cambrian aged ''Exsulans'' limestone which outcrops on the island of Bornholm in the Baltic Sea. The valves have a distinct subtriangular shape and possess a long straight hinge. The umbo is positioned notably anterior on the shell and the beak is bracketed by two teeth of indistinctly pyramidal shape. The presence of the teeth was later questioned in a 1998 study by G. Geyer and M. Streng and cited the lack of preserved muscle scars as reason to suspect the placement of ''Camya asy'' in Bivalvia. The family Camyidae was first proposed by Hinz-Schallreuter in a 2000 paper discussing the Cambrian bivalves from Bornholm and reviewing the proposed Cambrian bivalve taxa of the time. In the same paper, Hinz-Schallreuter noted that the species ''Modiolopsis thecoides'', known from one specimen which is now lost, most likely belonged to ''Camya''. As of 2011 the family has been placed as a sister taxon to the family Fordillidae in the Superfamily Fordilloidea. This superfamily includes the earliest confirmed crown group bivalves to have been described. ''Camya'' is one of only four accepted bivalve genera to have been described from the Cambrian, the other three being ''

Fordilla ''Fordilla'' is an extinct genus of early bivalves, one of two genera in the extinct family Fordillidae. The genus is known solely from Early Cambrian fossils found in North America, Greenland, Europe, the Middle East, and Asia.Pojetaia ''Pojetaia'' is an extinct genus of early bivalves, one of two genera in the extinct family Fordillidae. The genus is known solely from Early to Middle Cambrian fossils found in North America, Greenland, Europe, North Africa, Asia, and Austral ...

'', and ''

Tuarangia ''Tuarangia'' is a Cambrian shelly fossil interpreted as an early bivalve, though alternative classifications have been proposed and its systematic position remains controversial.Elicki, O., & Gürsu, S. (2009). First record of ~Pojetaia runnegar ...

''.

References

Prehistoric bivalve genera Cambrian molluscs Prehistoric life of Europe Fossil taxa described in 1995 Fossil taxa described in 2000 Monotypic mollusc genera {{paleo-bivalve-stub