hyolithid

[ hahy-ol-i-thid ]
/ haɪˈɒl ɪ θɪd /

noun

any invertebrate of the extinct genus Hyolithes, most common in the Cambrian Period, having a limy, univalve shell, and thought to be related to the pteropods.

adjective

belonging or pertaining to Hyolithes.

Origin of hyolithid

< New Latin Hyolith(es) (see hyoid, -lith) + -id2