Redfieldiidae
Redfieldiidae | ||||||||||||
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Redfieldius gracilis fossil in the University of Michigan Museum of Natural History. |
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Temporal occurrence | ||||||||||||
Triassic to Hettangian (Lower Jurassic) | ||||||||||||
Locations | ||||||||||||
Systematics | ||||||||||||
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Scientific name of the order | ||||||||||||
Redfieldiiformes | ||||||||||||
Berg , 1955 | ||||||||||||
Scientific name of the family | ||||||||||||
Redfieldiidae | ||||||||||||
Hutchinson, 1973 |
The Redfieldiidae are an extinct group of freshwater fish . They lived from the Triassic to the Lower Jurassic .
features
The Redfieldiidae had a spindle-shaped body, a terminal or lower mouth and a dorsal and anal fin lying far back, which were symmetrically opposite each other. The caudal fin was heterocerk . The number of fin rays was higher than that of the fin bearers (Radialia), the Branchiostegalstrahl reduced to one or two plate-shaped bones. The individual outer nostril, on each side of the head, was enclosed by an unmistakable “ premaxillary ”, the nasal , the rostral and the adnasal bone.
Genera
- Atopocephala
- Beaconia ?
- Brookvalia
- Cionichthys
- Daedalichthys
- Dictyopleurichthys
- Dictyopyge
- Geitonichthys
- Helichthys
- Ischnolepis
- Lasalichthys
- Mauritanichthys
- Molybdiethys
- Phlyctaenichthys
- Pseudobeaconia
- Redfieldius
- Schizurichthys
- Synorichthys
literature
- Michael J. Benton : Paleontology of the vertebrates. Translation of the 3rd English edition. Pfeil, Munich 2007, ISBN 978-3-89937-072-0 .
- Robert L. Carroll : Paleontology and Evolution of the Vertebrates. Thieme, Stuttgart et al. 1993, ISBN 3-13-774401-6 .
- Joseph S. Nelson : Fishes of the World. 4th edition. John Wiley & Sons, Hoboken NJ 2006, ISBN 0-471-25031-7 .
Web links
Commons : Redfieldiidae - collection of images, videos, and audio files
- The Paleobiology Database Redfieldiidae