• Source: Leptaena

Leptaena is an extinct genus of mid-sized brachiopod that existed from the Dariwilian epoch to the Emsian epoch, though some specimens have been found in strata as late in age as the Tournasian epoch. Like some other Strophomenids, Lepteana were epifaunal, meaning they lived on top of the seafloor, not buried within it, and were suspension feeders.




Physical description


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. Their width is usually greater than their length, like most Strophomenids.




Distribution


Leptaena fossils have been found on every continent except Antarctica.




Species


Leptaena was a diverse genus, with over 70 recognized species and subgenera. Species in the genus Leptaena include the following. Any synonymous genera to which a given species may belong to are labelled with the synonymous genus in parentheses.




References

Kata Kunci Pencarian:

• Daftar genus brakiopoda
• Leptaena
• Constantine Samuel Rafinesque
• Tufs et calcaires de Rosan
• 2024 in paleontology
• Rafinesquina
• Llallagua Formation
• Josephulus
• Mulde Formation
• Eugène Eudes-Deslongchamps
• Ludlow Group