hy•ol•i•thidPronunciation: (hī-ol'i-thid), [key]
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.
belonging or pertaining to Hyolithes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.