Pholidophoriformes
| Pholidophoriformes | ||||||||||||
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Pholidophorus from the Jurassic plate limestone from Solnhofen in the Museum für Naturkunde Berlin. |
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| Temporal occurrence | ||||||||||||
| Upper Triassic to Lower Cretaceous | ||||||||||||
| 203.6 to 99.6 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Pholidophoriformes | ||||||||||||
| Berg , 1940 |
The Pholidophoriformes are an extinct bony fish order from the class of the ray fins (Actinopterygii). The group lived from the Upper Triassic to the Lower Cretaceous . They had the maximum of their variety of forms in the Upper Jura .
features
Most of the Pholidophoriformes were short and slender. Her scales were thin and still had a very weak layer of ganoin . The dorsal and anal fins were small, the caudal fin heterocerk . The jaws were short and set with sharp, small teeth. There were two supramaxillaries above the maxillary . The premaxillary was pushed forward and small. The lower jaw was mostly without pre-articular and always without coronide.
Systematics
The Pholidophoriformes are probably a polyphyletic group of primitive real bony fish (Teleostei). Some of their families could have a common origin with the Leptolepiformes in the Triassic have other independent of the former common ancestors with the elopomorpha and Knochenzünglerähnlichen (Osteoglossomorpha) in the Triassic or the Jura. The ancestors of most recent Teleostei may also be found in the group .
Familys
literature
- Joseph S. Nelson : Fishes of the World . John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
- Arno Hermann Müller: Textbook of paleozoology. Volume III, Vertebrates, Part 1. Gustav Fischer Verlag, 1985.
- Gloria Arratia: Morphology, taxonomy, and phylogeny of Triassic pholidophorid fishes (Actinopterygii, Teleostei). Journal of Vertebrate Paleontology, Volume 33, Supplement 1, 2013 DOI: 10.1080 / 02724634.2013.835642
