Crossognathiformes
| Crossognathiformes | ||||||||||||
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Pachyrhizodus caninus , skeletal reconstructions in the North American Museum of Ancient Life. |
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| Temporal occurrence | ||||||||||||
| Aptium (Lower Cretaceous) to Danium (Paleocene) | ||||||||||||
| 125 to 61.7 million years | ||||||||||||
| Locations | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Crossognathiformes | ||||||||||||
| Tavern , 1989 |
The Crossognathiformes are an extinct marine bony fish order from the class of the ray fins (Actinopterygii). The group lived from the Lower Cretaceous to the Paleocene .
features
The Crossognathiformes were medium-sized fish with a slender body, long head and pointed snout with a deep cleft mouth. The short, triangular dorsal fin sat in front of the middle of the body. The pectoral fins were slender and narrow, the caudal fin deeply split.
External system
The systematic position of the Crossognathiformes is uncertain. What is certain is that they belong to the Teleostei , the higher bony fish. Loius Taverne classifies them as a primitive sister group of the Clupeomorpha and Euteleostei within the Clupeocephala .
Internal system
- Family Crossognathidae
- Family Notelopidae
- Family Pachyrizodontidae
- Aquilopiscis
- Elopopsis
- Goulmimichthys
- Greenwoodella
- Me in
- Nardopiscis
- Pachyrizodus
- Platinx (only genus from the Paleocene)
- Rhacolepis
- Tingitanichthys
- Family Varasichthyidae
literature
- Joseph S. Nelson, Terry C. Grande, Mark VH Wilson: Fishes of the World. Wiley, Hoboken, New Jersey, 2016, ISBN 978-1118342336
- Karl Albert Frickhinger: Fossils Atlas Fish , Mergus-Verlag, Melle, 1999, ISBN 3-88244-018-X
Web links
- The Paleobiology Database Crossognathiformes