Petalichthyida
| Petalichthyida | ||||||||||||
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Lunaspis broili in the American Museum of Natural History in New York |
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| Temporal occurrence | ||||||||||||
| Lower Devon to Upper Devon | ||||||||||||
| ? to ? Million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Petalichthyida | ||||||||||||
| Jaeckel , 1911 |
The Petalichthyida (Petalichthyformes) are a group of the extinct Placodermi , fish-like, armored vertebrates from the Devonian . They were bottom-dwelling marine animals. In total only eight genera have been described. The group reached its highest diversity in the Lower Devonian, only a few species survived as far as the Upper Devonian.
features
They resemble primitive Arthrodirs , but the trunk armor was shorter and did not close behind the pectoral fins . Her body was flattened, her eyes stood on the top of her head, her pectoral fins stood out from her body. On all plates of the bone armor there were protruding, characteristic lines and tubercle-like elevations. The jaw and mouth of the Petalichthyida have not been preserved in any of the fossils found .
Systematics
The order Petalichthyida contains only one family , the Macropetalichthyidae.
Some genera:
- Ellopetalichthys
- Epipetalichthys
- Lunaspis
- Macropetalichthys
- Notopetalichthys
- Quasipetalichthys
- Shearsbyaspis
- Wijeaspis
literature
- Joseph S. Nelson : Fishes of the World . John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
- Robert L. Carroll: Paleontology and Evolution of the Vertebrates . Thieme, Stuttgart 1993, ISBN 3-13774-401-6 .
- John A. Long: The Rise of Fishes . The Johns Hopkins University Press, 1995, ISBN 0801849926 .
Web links
- Petalichthyida at Palæos