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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 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 ...
Hemiconcavodonta minuta is a bivalve which was first described in 1999 by Teresa M. Sánchez from fossils from sediments of the late Middle Ordovician, Caradocian-aged Don Braulio Formation. The formation outcrops on the flank of Sierra de Villicum in the Argentina precordillera .
Entobia in a bivalve shell, Florida.. Entobia is a trace fossil in a hard substrate (typically a shell, rock or hardground made of calcium carbonate) formed by sponges as a branching network of galleries, often with regular enlargements termed chambers.
Anadara is a genus of saltwater bivalves, ark clams, in the family Arcidae. It is also called Scapharca. [1] This genus is known in the fossil record from the Cretaceous period to the Quaternary period (age range: 140.2 to 0.0 million years ago). These fossils have been found all over the world. [2]
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 ]
Of Campanian age, this genus is widespread as a fossil in Cameroon, France, Poland, Austria, Germany and the United States. Fossils up to the Neogene have been found in Belgium , the United Kingdom , and Venezuela ( Pliocene Mare and Playa Grande Formations ) and Miocene Bulgaria , Chile , Colombia , Cyprus , Germany, India , Japan , Malta ...
Concavodonta is a small bivalve which was first described in 1972 by Claude Babin and Michel Melou. [1] Generally the shells of Concavodonta are fairly rounded [2] to ovoid [1] in shape. As the type genus for the subfamily Concavodontinae, the hinge displays the typical chevroning of teeth where the concavity in the chevron faces away from the ...