brachiolaria


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Related to brachiolaria: doliolaria larva

brachiolaria

[‚bra·kē·ō′la·re·ə]
(invertebrate zoology)
A transitional larva in the development of certain starfishes that is distinguished by three anterior processes homologous with those of the adult.
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The species of Echinasteridae already studied have a similar lecithotrophic brachiolaria larval development (Chia, 1966; Atwood, 1973; Siddall, 1979; McEdward and Chia, 1991; Mercier and Hamel, 2008; Eemisse et al.
Once the competent brachiolaria stage was attained, the larvae initiated their attachment-settlement phase and could no longer be sampled randomly because of interindividual variability in their swimming-attachment behavior.
Here we document the distribution of synaptotagmin immunoreactive cells and the organization and morphology of the NS in the brachiolaria and juveniles of asterinids with different modes of development.
From the tip of the longest arm to the posterior end of the larval body, early brachiolaria larvae have a length of about 600 [micro]m (615 [+ or -] 62 [micro]m; n = 9), which increases up to about 950 [micro]m for late brachiolariae (944 [+ or -] 111 [micro]m; n = 13).
On removal from the gonad, blastulae floated at the air-water interface and continued development through the brachiolaria larval stage, metamorphosing into juveniles in 3 weeks.
Embryos removed from the gonad at the early blastula stage developed independently of the parent through the wrinkled blastula and gastrula stages into a planktonic highly buoyant brachiolaria.
ochraceus because this species possesses both bipinnaria and brachiolaria larval stages.
Once bipinnaria in this treatment had doubled in length while developing into brachiolaria larvae (at about day 45), a fivefold increase was observed in the incidence of cloning (6%, Fig.
This species has planktotrophic development through bipinnaria and brachiolaria feeding stages (Byrne and Barker, 1991).
For example, Astropecten latespinosus (300 [[micro]meter]) has an abbreviated lecithotrophic development, lacks both a bipinnaria and a brachiolaria stage, and is in the plankton for only about 4 days (36).
In Asterina gibbosa (abbreviated development), hatching occurs 85 to 96 h after fertilization and produces a thoroughly transformed brachiolaria that rapidly adheres to the substratum (Marthy, 1980).
regularis shows what is considered to be the ancestral pattern for asteroids (Strathmann, 1978), developing through planktotrophic bipinnaria and brachiolaria larvae (Byrne and Barker, 1991).