Edrioaster sentence example

edrioaster
  • 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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  • No other way out for them is apparent, and it is clear that Edrioaster was not permanently and solidly fixed to the sea-floor.
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  • We suppose some such form as Edrioaster, which appears to have lived near the shore, to have been repeatedly overturned by waves.
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  • If this be correct, the only change from Edrioaster, as regards the ambulacra, was that in Palaeodiscus the covering-plates could no longer open, but closed permanently over the whole groove, while the podia issued through slits between them.
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  • The genital organs in both Asteroidea and Echinoidea would retain the interradial position they first assumed in Edrioaster; and in Echinoidea their primitive temporary openings to the exterior were converted into definite pores, correlated with five interradially placed plates at the aboral pole.
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