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Bipinnaria

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bipinnaria [¦bī·pi′ner·ē·ə]
(invertebrate zoology)
The complex, bilaterally symmetrical, free-swimming larval stage of most asteroid echinoderms.
Bipinnaria 

the freely swimming larva of starfish; it has two flickering whips (fins). Like other dipleurulas, it is bisymmetrical and has three pairs of coeloms. Bipinnaria turns into Brachiolaria. Its morphology is similar to that of other invertebrates (such as marine bristle worms, Enteropneusta, and Pogonophora), which suggests the derivation of these groups from a common ancestor.

V. A. SVESHNIKOV
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In the present study, bipinnaria larvae of the sea star Luidia foliolata were surgically bisected in order to induce regeneration.
CHARACTERIZATION OF NOVEL GENES EXPRESSED DURING LARVAL SEA STAR ... by Journal of the Alabama Academy of Science
 
 
 
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