Primitive catfish
| Primitive catfish | ||||||||||||
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Diplomystes nahuelbutaensis |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Diplomystidae | ||||||||||||
| Eigenmann , 1890 |
The primitive catfish ( Diplomystidae) are a fish family from the order of the catfish-like (Siluriformes). They occur in fresh water in Chile and Argentina .
Primitive catfish are medium-sized fish with a body length of up to 32 centimeters. The maxillary bone is well developed and has teeth. There is a pair of barbels on the upper jaw, otherwise there are no barbels. The dorsal fin has one hard and six or seven soft rays. The anal fin has 9 to 12 primary rays, the caudal fin 18. The pectoral fins have a hard ray. An adipose fin is present. The asteriscus is as big as the lapillus or larger.
Systematics
In the classical system, the primitive catfish are seen as the only family of the superfamily Diplomystoidea as a sister group of all other catfish species. Molecular biological studies, however, indicate a position together with the subordination Siluroidei to the Loricarioidei .
The family currently includes two genera with a total of seven species:
swell
- Joseph S. Nelson : Fishes of the world . 4th edition. John Wiley & Sons, Hoboken 2006, ISBN 978-0-471-25031-9 , pp. 164 .
- Primitive catfish on Fishbase.org (English)
Individual evidence
- ^ Joseph S. Nelson: Fishes of the world . 4th edition. John Wiley & Sons, Hoboken 2006, ISBN 978-0-471-25031-9 , pp. 164 .
- ↑ JP Sullivan, Lundberg JG; Hardman M: A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences . In: Mol Phylogenet Evol. . 41, No. 3, 2006, pp. 636-62. doi : 10.1016 / j.ympev.2006.05.044 .