单词	Larvacea
释义	Larvacea /lɑːˈveɪʃə / plural noun Zoology A class of minute transparent planktonic animals related to the sea squirts. They have a tadpole-like body which is typically enclosed in a gelatinous ‘house’ that is regularly shed and replaced.Within the urochordates, both genes placed Oikopleura (class Larvacea) as the sister group to all other urochordates. Derivatives larvacean adjective & noun ... Ascidians and thaliaceans (which, along with the larvaceans, comprise the subphylum Urochordata) display a biphasic life-history with morphologically dissimilar larval and adult body plans. This supposition is largely based on data which suggests that, within the urochordates, the directly developing larvaceans are most primitive and the other two chordate subphyla are exclusively directly developing. Other more sophisticated jelly creatures include some mollusks and snails, and tunicates - sea squirts, salps and larvaceans. Origin Modern Latin (plural), from larva.
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