Psammosteidae
| Psammosteidae | ||||||||||
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Model of Drepanaspis gemuendensis in the Smithsonian National Museum of Natural History. |
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| Temporal occurrence | ||||||||||
| Lower Silurian to Upper Devonian | ||||||||||
| 430 to 370 million years | ||||||||||
| Locations | ||||||||||
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| Systematics | ||||||||||
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| Scientific name | ||||||||||
| Psammosteidae | ||||||||||
| Traquair , 1896 |
The Psammosteidae are an extinct taxon of marine vertebrates . They belonged to the Heterostraci , a subgroup of the Pteraspidomorphi , with which the Psammosteidae belonged to the jawless ( Agnatha ), i.e. H. to distant relatives of today's fish.
Fossils of the Psammosteidae can be found in the Silurian and Devonian (430-370 million years ago). They had skull armor, but not a jaw. Compared to the other Heterostraci, which reached a length of 5 - 30 cm, the Psammosteidae were significantly larger with up to 150 cm.
literature
- Obruchev, DV and Mark-Kurik, E. (1968): On the evolution of the psammosteids (Heterostraci). Eesti NSV Teaduste Akadeemia Toimetised, Geoloogia, 17, 279-284.
- Tarlo, LBH (1964): Psammosteiformes (Agnatha). 1 General part. Palaeontologia Polonica , 13, 1-135.
- Tarlo, LBH (1965): Psammosteiformes (Agnatha). 2 Systematic part. Palaeontologia Polonica , 15, 1-164.
Web links
Commons : Psammosteidae - Collection of images, videos and audio files
- The Paleobiology Database: Psammosteidae Traquair 1896 (jawless fish)