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The shells of bivalves are used in craftwork, and the manufacture of jewellery and buttons. Bivalves have also been used in the biocontrol of pollution. Bivalves appear in the fossil record first in the early Cambrian more than 500 million years ago. The total number of known living species is about 9,200. These species are placed within 1,260 ...
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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.
Tuarangia is a Cambrian shelly fossil interpreted as an early bivalve, [1] though alternative classifications have been proposed and its systematic position remains controversial. [2] It is the only genus in the extinct family Tuarangiidae [ 3 ] and order Tuarangiida . [ 1 ]
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 . [ 3 ]
This category lists bivalve taxa which are extinct according to Wikipedia's Conservation status categories: Bivalves that are extinct according to the IUCN Red List; Bivalves that became extinct after the year 1500. Bivalve taxa which died out before 1500 are listed in Category:Prehistoric gastropods.
Neithea is an extinct genus of bivalve molluscs that lived from the Early Jurassic to the early Paleocene, with a worldwide distribution. [1] Neithia sp. are inequivalve. That means that the two valves are not the same shape, the right valve being strongly concave and the left valve being flattened or concave.
This genus is known in the fossil record from the Carboniferous period to the Eocene period (from about 313.8 to 37.2 million years ago). Fossils of species within this genus have been found in marine sediments all over the world.