Zenaspididae is an extinct family of jawless fish in the order
Zenaspida
Zenaspidida is an extinct order of osteostracans, a group of jawless stem-gnathostomes. They possessed a distinct headshield, which varied in width to length ratio by species.
Description
The head shield is dome-shaped and extremely large in ...
.
[A New Osteostracan Fauna From The Devonian Of The Welsh Borderlands And Observations On The Taxonomy And Growth Of Osteostraci. Joseph N. Keating, Robert S. Sansom and Mark A. Purnell, Journal of Vertebrate Paleontology 32(5):1002–1017, September 2012]
References
External links
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Osteostraci
Prehistoric jawless fish families
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