Bipinnaria


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Related to Bipinnaria: Brachiolaria

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

References in periodicals archive ?
According to Gale (2011), the LMM seems to be related to development from a brachiolaria larva, in contrast to the bipinnaria and barrel-shaped larvae of paxillosids.
regularis is included here for comparative purposes as the second bipinnaria examined with the synaptotagmin marker.
Small processes on the side of the body appeared at the part corresponding to the bipinnarian arms of bipinnaria of A.
In contrast, Saranchova and Fly-achinskaya (2001) recorded 100% survival of bipinnaria of A.
The nervous system of the auricularia, bipinnaria, and tornaria develops in association with the ciliary bands (4-11).
Five days after initial fertilization, bipinnaria larvae were gently removed from the culture and preserved in 95% ethanol for genotyping.
Unlike plutei, the bipinnaria larvae of asteroids lack internal skeletons, but under low food conditions the homologous ciliated band was lengthened by elaboration of body margins or by an increase in overall body size (Strathmann, 1989; George, 1994, 1999).
Initially, cloning larvae were thought to be restricted to species in the genus Luidia, which have bipinnaria larvae that lack a brachiolar complex and are, in some Luidia species, quite large (Wilson, 1978; Domanski, 1984; Bosch et at.
Bipinnaria and brachiolaria larvae of the asteroids Luidia foliolata and Pisaster ochraceus were surgically bisected into anterior and posterior portions, and the regeneration process was followed for 2 weeks (Vickery and McClintock, 1998).
Ciliary band innervation in the bipinnaria larva of Pisaster ochraceus.
The capacity for asexual reproduction (cloning) in sea star larvae was first suggested over 60 years ago from observations of the bipinnaria larvae of Luidia sarsi (Tattersall and Sheppard, 1934), but subsequent laboratory experiments indicated that these larvae were incapable of asexual reproduction (Wilson, 1978).