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Agerostrea is an extinct genus of fossil oysters, marine bivalve molluscs in the family Ostreidae, the true oysters. It is present in the Maastrichtian , the upper stage of the Late Cretaceous epoch, from 72.1 to 66 million years ago.
The largest known extinct bivalve is a species of Platyceramus whose fossils measure up to 3,000 mm (118 in) in length. [ 64 ] In his 2010 treatise, Compendium of Bivalves , Markus Huber gives the total number of living bivalve species as about 9,200 combined in 106 families. [ 65 ]
Bakevelliidae is an extinct family of prehistoric bivalves that lived from the Late Mississippian until the Middle Eocene. [1] 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 ...
All species of this genus, including the remaining extant species, G. humanus, are found in the fossil record from the Cretaceous to the Pliocene (age range: from 99.7 to 2.588 million years ago). Fossils are found in the marine strata of Eastern North America, Eurasia and the Indo-Pacific. [2] Fossil shell of Glossus humanus from Pliocene of Italy
Alatoconchidae is an extinct family of prehistoric bivalves that lived in the early to middle Permian period. [1] [2] [3] Genera belonging to Alatoconchidae are characterized by their shell that is strongly compressed in the dorsoventral direction. [3]
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 ]
Requienia is an extinct genus of fossil saltwater clam, a marine bivalve molluscs in the order Hippuritida, family Requieniidae. These rudists lived in the Cretaceous period, from the Valanginian age (136.4–140.2) to the Campanian age (70.6–83.5 mya). They were stationary intermediate-level suspension feeders.
Similodonta is a small bivalve which was first described in 1964 by Helen Soot-Ryen in an Arkiv för Mineralogi och Geologi, Kungliga Svenska Vetenskapsakademien paper. [3] Generally the shells of Similodonta are rounded on the ventral sides of the shell and triangular on the dorsal sides. The triangular shape on the dorsal side is formed by ...