Ophiurids sentence example
ophiurids
- Turning to fossil Asteroidea, we find the earlier ophiurids scarcely distinguishable from the asterids, while in the alternation of the ambulacrals, which undoubtedly correspond to the flooring-plates of Edrioaster, both groups approach the Pelmatozoan type.
- There is no difficulty in deducing the highly differentiated asterids and ophiurids of a later day from these simpler types.