Redfieldiidae

Redfieldiidae
Redfieldius gracilis fossil in the University of Michigan Museum of Natural History.
Temporal occurrence
Triassic to Hettangian (Lower Jurassic)
Locations
North America , South America , Australia , Morocco
Systematics
Trunk : Chordates (chordata) Sub-stem : Vertebrates (vertebrata) Superclass : Jaw mouths (Gnathostomata) Class : Ray fins (Actinopterygii) Order : Redfieldiiformes Family : Redfieldiidae
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