Pentamerida
| Pentamerida | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Conchidium biloculare (Hisinger, 1799) |
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| Temporal occurrence | ||||||||||||
| Ordovician to Perm | ||||||||||||
| 485 to 250 million years | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Pentamerida | ||||||||||||
| Schuchert & Cooper , 1931 |
Pentamerids (Pentamerida) are an extinct taxon of large arm pods (Brachiopoda) with strongly domed impunctate shells and a short lock rim. Together with the Protorthida , Orthida , Rhynchonellida , Atrypida , Spiriferida , Athyridida and Terebratulida , they form the taxon Rhynchonellata , which in turn belongs to the sub-strain of the Rhynchonelliformea .
features
The strongly arched biconvex case has strongly developed lock teeth and lock extensions ( cardinalia ), spoon-shaped converging tooth supports ( spondylium ) and an open delthyrium (stem opening) without deltidial plates . The group was first named in 1931 by Charles Schuchert and G. Arthur Cooper .
Systematics
The pentamerids are a relatively small group, their best-known representatives are the genera Conchidium from the Ordovician to Devon and Pentamerus from the Silurian .
literature
- Bernhard Ziegler: Introduction to Paleobiology Part 3 - ISBN 3-510-65179-0
- Treatise of Invertebrate Paleontology: H (Brachiopoda revised) 2 - ISBN 0-8137-3108-9
- Ulrich Lehmann, Gero Hillmer: Invertebrates of the past - ISBN 3-432-90653-6
