Ctenothrissiformes
| Ctenothrissiformes | ||||||||||||
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Ctenothrissa vexillifer |
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| Temporal occurrence | ||||||||||||
| Upper Chalk | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Ctenothrissiformes | ||||||||||||
| Patterson , 1964 |
The Ctenothrissiformes are an extinct group of bony fish from the Upper Cretaceous . They were early and primitive representatives of the Acanthomorpha , the group of fish that eventually led to the modern fish that carry barbed fin.
features
The Ctenothrissiformes were short, high-backed and deep-bellied fish that had 29 to 35 vertebrae. The maxillary no longer played a role in the formation of the jaw margin, although, as in the lower teleostei , two supramaxillaries were still present. The particularly large third pharyngobranchial is striking in the gill arch skeleton. The pectoral fins sat relatively high up on the shoulder girdle, the pelvic fins moved to a position below the pectoral fins. Real fin spines were still missing, an adipose fin was not present. In the tail fin skeleton there are still 6 hypuralia and 3 epuralia. The scales are ctenoid-like .
Genera
- Ctenothrissa
- Heterothrissa
- Aulolepis
- Humilichthys
- Pateroperca
- Pattersonichthys
- Phoenicolepis
- Protriacanthus
literature
- Robert L. Carroll : Paleontology and Evolution of the Vertebrates. Thieme, Stuttgart et al. 1993, ISBN 3-13774-401-6 .
- Joseph S. Nelson : Fishes of the World. 4th edition. John Wiley & Sons, Hoboken NJ 2006, ISBN 0-471-25031-7 .
Web links
- The Paleobiology Database: Ctenothrissiformes