Hybodontiformes
| Hybodontiformes | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Hybodus fraasi from the Solnhofen limestone in the Museum für Naturkunde Berlin |
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| Temporal occurrence | ||||||||||||
| Carbon to Upper Chalk | ||||||||||||
| 330? up to 65 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Hybodontiformes | ||||||||||||
| Owen , 1846 |
The Hybodontiformes are an extinct group of shark-like cartilaginous fish that lived from the Carboniferous to the Cretaceous . They had two dorsal fins, each with a strong spike. The fish were 15 centimeters to several meters long.
The Hybodontiformes belong to the subclass of the plate gill (Elasmobranchii) and are probably the sister group of the Neoselachii , the modern sharks and rays . The first Hybodontiformes appeared in the Lower Carboniferous, in the Mississippian . Along with the Neoselachii, they were the only plate gills to survive the mass extinctions at the end of the Permian and during the Triassic and only disappeared at the end of the Cretaceous. The Neoselachii are the only plate gills still alive today.
Genera
- Acrodus Agassiz in Alberti, 1834
- Asteracanthus
- Hamiltonichthys
- Hybodus Agassiz, 1837
- Lissodus Brough, 1935
- Lonchidion Estes, 1964
- Palaeobates Meyer, 1849
- Polyacrodus Jaekel, 1889
- Protacodus
- Pseudodalatias
- Ptychodus Agassiz, 1835
- Steinbachodus Reif 1980
- Tribodus
swell
- Joseph S. Nelson : Fishes of the World . 4th ed. John Wiley, Hoboken, NJ 2006, ISBN 0-471-25031-7 .
- Hybodontiformes . In: Mikko's Phylogeny Archive .
