Zenaspidida | |
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Fossil of Zenaspis powriei | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | †Osteostraci |
Order: | †Zenaspidida Stensiö, 1958 |
Subgroups | |
Synonyms | |
Zenaspida |
Zenaspidida is an extinct order of osteostracans, a group of jawless stem-gnathostomes.[1] They possessed a distinct headshield, which varied in width to length ratio by species.