Rajiformes
| Rajiformes | ||||||||||||
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Amblyraja badia |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Rajiformes | ||||||||||||
| Berg , 1940 |
Depending on the author, one to four recent families of rays are combined in the order of the Rajiformes . The system of rays is highly controversial and subject to constant revisions.
features
The Rajiformes have a flattened trunk and enlarged pectoral fins, which, except for the fiddle rays (Rhinobatidae), reach from the side of the head to the tail stalk. An anal fin is always missing, caudal and dorsal fins are still present in some families, but not in others. Eyes and gill openings are on the top.
Familys
- Real rays (Rajidae)
- Soft-nosed rays (Arhynchobatidae)
- Anacanthobatidae (not recognized as a valid family by all authors.)
- Gurgesiellidae
- Cyclobatidae †
The assignment of the fossil family of the Cyclobatidae to the Rajiformes is not recognized equally by all authors and some see the genus Ostarriraja from the Miocene of Upper Austria as the oldest undoubted evidence of a representative of the order of which more than a few individual teeth have been preserved.
literature
- Joseph S. Nelson : Fishes of the World , John Wiley & Sons, 4th Edition, 2006, ISBN 0-471-25031-7 .
Individual evidence
- ^ Last, PR, Weigmann, S. & Yang, L. (2016): Changes to the nomenclature of the skates (Chondrichthyes: Rajiformes). Pages 11 to 34 in Last, PR & Yearsley, GK (Ed.) (2016): Rays of the World: Supplementary information. CSIRO Australian National Fish Collection.
- ↑ G. Marrama, O. Schultz & J. Kriwet: A new Miocene skate from the Central Paratethys (Upper Austria): the first unambiguous skeletal record for the Rajiformes (Chondrichthyes: Batomorphii). In: Journal of Systematic Palaeontology , 2018, 24 pp. Doi : 10.1080 / 14772019.2018.1486336
Web links
- Rajiformes on Fishbase.org (English)