Acanthothoraci
Extinct order of fishes / From Wikipedia, the free encyclopedia
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Acanthothoraci (spine chests) is an extinct group of chimaera-like placoderms closely related to the rhenanid placoderms. Superficially, the acanthoracids resembled scaly chimaeras and (relatively) heavily armored ptyctodonts. They were distinguished from chimaeras by their large scales and plates, a pair of large spines that emanate from their chests (thus, the order's name), tooth-like beak plates, and the typical bone-enhanced placoderm eyeball. They were distinguished from other placoderms by differences in skull anatomy and by patterns on the skull plates and thoracic plates that are unique to this order.
Acanthothoraci Temporal range: Early to Middle Devonian | |
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Weejasperaspis gavini, Murrindalaspis wallacei & Brindabellaspis stensioi | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | †Placodermi |
Order: | †Acanthothoraci Stensiö, 1944 |
Families | |
Weejasperaspididae † | |
Synonyms | |
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