单词	pterobranch
释义	pterobranch /ˈtɛrə(ʊ)braŋk / noun Zoology A minute tube-dwelling colonial acorn worm found chiefly in deep water. Class Pterobranchia, phylum Hemichordata. The SSU data supported enteropneust paraphyly by placing acorn worms of the family Ptychoderidae as the sister to a group consisting of pterobranchs + acorn worms of the family Harrimaniidae.... Previously, hemichordates were thought to be paraphyletic, with enteropneusts (acorn worms) more closely related to chordates and pterobranchs closer to echinoderms. The ciliary bands on the phoronid and brachiopod tentacles are upstream-collecting bands with separate cilia on monociliate cells just like those of larvae or adults of pterobranchs, echinoderms and enteropneusts.
随便看	overturner overtwist overtwisted overtype over-under over/under overuse over-vain overvaluation overvalue overvault overvaulting over-veil overventilate overventilation overview overviewer over-violent overvoltage overvote overvoting overvulcanise over-vulcanization over-vulcanize overvulcanize

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