Ostracoderm
The ostracoderms are a class of extinct fish. They were bony-armoured jawless fish, the Osteostraci ("bony shields"). They lived in what is now North America, Europe and Russia from the Middle Silurian to Upper Devonian. They were the first fish to use gills just for respiration.
| Osteostraci | |
|---|---|
| |
| Cephalaspis | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Subphylum: | |
| Class: | Osteostraci Lankester, 1868
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Ostracoderms were the first fossil fish to be discovered. They were found in the 1830s in the Old Red Sandstone of Scotland. The genus Cephalaspis is quite a common fossil in these rocks.[1]
The term "Ostracoderm" is polyphyletic, because it refers to groups which should not be lumped together.[2]
Ostracoderm Media
Various ostracoderms of the class Osteostraci ('bony-shields')
The galeaspids Asiaspis expansa, Lungmenshenaspis kiangyouensis, and Bannhuanaspis vukhuci, and a pair of
Larnovaspis stensioei (formerly Pteraspis)
References
- ↑ Maisey, John G. 1996. Discovering fossil fishes. New York: Henry Holt & Company. p37
- ↑ Benton, Michael 2009. Vertebrate Palaeontology Edition 3, page 44, John Wiley & Sons. ISBN 9781405144490.