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.
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  • There is no difficulty in deducing the highly differentiated asterids and ophiurids of a later day from these simpler types.
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