Strophomenida

Leptaena depressa a Strophomenide from the Silurian of Gotland (Sweden)

• Worldwide

Strophomeniden ( Strophomenida ) are an extinct taxon of brachiopods ( Brachiopoda ) with usually relatively long and straight edge and a castle pseudopunctaten shell without spines. They form together with the Billingsellida, Orthotetida and Productida the taxon Strophomenata that counts its part to the lower trunk of the Rhynchonelliformea ​​.

Features

The Armgerüst missing or consists of Brachiophoren. Castle teeth are usually present but functionally replaced in some cases by a series of denticles along the rim lock. In the history of the earth they come from Ordovician to Carboniferous ( as "living fossils" of the Mesozoic to possibly Jurassic) on. Your case is in some groups to have grown with the shell on the ground. Almost always there is your case of a concave and a convex (rarely a biconvex ) flap. The group was first named in 1934 by Öpik.

System

The Strophomeniden divided into two Untertaxa that Strophomenoidea and Plectambonitoidea which are listed below together with their minor systematic Units:

• Strophomenoidea Strophomenidae
• Rafinesquinidae
• Glyptomenidae
• Foliomenidae
• Christianiidae
• Leptaenoideidae
• Amphistrophiidae
• Douvillinidae
• Leptostrophiidae
• Eopholidostrophiidae
• Strophodontidae
• Shaleriidae
• Strophonellidae

• Plectambonitidae
• Taffiidae
• Bimuriidae
• Syndielasmatidae
• Leptellinidae
• Grorudiidae
• Leptestiidae
• Xenambonitidae
• Hesperomenidae
• Sowerbyellidae