单词	echinoid
释义	echinoid /ˈɛkɪnɔɪd / Zoology noun An echinoderm of the class Echinoidea; a sea urchin.Fossils include foraminiferans, brachiopods, echinoids, pelecypods, cephalopods, shark teeth, fish vertebrae, as well as asteroids, gastropods, a pterosaur, a nodosaurid, and decapods.... We have interpreted it as a synapomorphy for asteroids, ophiuroids, echinoids, and holothuroids, to the exclusion of the crinoids. Sponges are preyed upon by gastropods, polychaetes, asteroids, echinoids, turtles, and fishes. adjective Relating to or denoting echinoids.Seven horizons of echinoid aggregations, totaling approximately 3 % of the channel thickness, occur in the black shale.... In the echinoid gene order, the tRNA gene cluster follows the putative control region. This implies that the ancestral polarity of the 4.6-kb inversion is the echinoid pattern. Rhymes crinoid
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