Skip to content
Vinony
Sections
Maps
Timeline
Graph
Cosmos
Life
Culture
Innovation
People
Climate
Trends
Art
Browse
Search
Search Vinony…
⌘
K
Sign in
Category
Acanthothoracids
page 1
Acanthothoraci
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 uniq