hippocampus

A small fish, so termed from the head resembling that of a horse. They live among reeds and long fuci, to which they cling with prehensile tails.

hippocampus
hippŏcampus or -os, i, m., = ἱππόκαμπος, a sea-horse : Syngnathus hippocampus, Linn.; Plin. 32, ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Hippocampus
·noun A genus of lophobranch fishes of several species in which the head and neck have some resembla...

Webster's Dictionary of the English Language