Orthida
| Orthida | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hesperorthis martinsonii (Bassett, 1974) |
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| Temporal occurrence | ||||||||||||
| Cambrian to Permian | ||||||||||||
| 540 to 250 million years | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Orthida | ||||||||||||
| Schuchert & Cooper , 1932 |
Orthiden (Orthida) are an extinct taxon of arm pods (Brachiopoda) with a straight lock rim and an impunctate or endopunctate shell. Together with the Protorthida , Rhynchonellida , Atrypida , Spiriferida , Athyridida and Terebratulida , they form the taxon Rhynchonellata , which in turn belongs to the sub-strain of the Rhynchonelliformea .
features
Their housing usually consists of biconvex valves. Orthids do not have a real arm structure, only small support plates ( brachiophores ) can be formed. The group was first named by Schuchert and Cooper in 1932 .
Systematics
The orthids are divided into four sub-taxa , which are subdivided according to the formation of the delthyrium , the spondylium and puncture of the shell:
- Billingsellacea
- Clitambonitacea
- Orthacea
- Enteletacea or (Dalmanellacea)
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
Individual evidence
- ↑ Ch. Schuchert & GA Cooper: Brachiopod Genera of the Suborders Orthoidea and Pentameroidea. In: Memoirs of the Peabody Museum of Natural History , Volume 4, Part 1, 270 pp., 1932 (digitized version)