Leptaena Temporal range: | |
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Leptaena rhomboidalis | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Brachiopoda |
Class: | † Strophomenata |
Order: | † Strophomenida |
Family: | † Rafinesquinidae |
Subfamily: | † Leptaeninae |
Genus: | † Leptaena Dalman, 1828 |
Type species | |
Leptaena rugosa Dalman, 1828 | |
Species | |
See Species | |
Synonyms | |
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Leptaena is an extinct genus of mid-sized brachiopod that existed from the Dariwilian epoch to the Emsian epoch, [1] [2] though some specimens have been found in strata as late in age as the Tournasian epoch. [1] [3] Like some other Strophomenids, Lepteana were epifaunal, meaning they lived on top of the seafloor, not buried within it, and were suspension feeders. [4]
Leptaena usually have concentric wrinkling and concentric lines on the shell. Leptaena have a concavo-convex profile, and are sometimes Semiquadrate to semielliptical. The Cardinal Process is split in two and the hinge line is straight. [4] Their width is usually greater than their length, like most Strophomenids.
Leptaena fossils have been found on every continent except Antarctica. [3] [5] [6]
Leptaena was a diverse genus, with over 70 recognized species and subgenera. Species in the genus Leptaena include the following. [3] [6] [7] Any synonymous genera to which a given species may belong to are labelled with the synonymous genus in parentheses.
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Gigantoproductus giganteus is an extinct species of brachiopods in the family Monticuliferidae, known only from its fossil remains. It was a marine invertebrate found on the seabed in shallow seas. It evolved during the Carboniferous period and it is believed to be the largest brachiopod that has ever existed.
Rafinesquina is an extinct genus of large brachiopod that existed from the Darriwilian to the Ludlow epoch.
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Diaphragmus is an extinct genus of brachiopod belonging to the order Productida and family Linoproductidae. Specimens have been found in Carboniferous beds in North America.
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