Anaspida
plural noun
An·as·pi·da
-pədə
: a class or other division of primitive fishlike ostracoderms having a heterocercal tail and a covering of small elongated scales and known from Silurian-Devonian transition beds of Europe and America
Word History
Etymology
New Latin, from an- + -aspida (from Greek aspid-, aspis shield)
First Known Use
1893, in the meaning defined above