a.1.(Zool.) Having both a preoral and a posterior band of cilla; - applied to the larvæ of certain annelids.
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These larvae all bear prototrochal, telotrochal, and neurotrochal ciliary bands, as well an apical tuft of cilia at the anterior end.
Metamorphic stages were scored according to the following criteria, documented previously in Santagata (2002): stage one--partial histolysis of hood, telotrochal cells, and the larval portion of the tentacles; stage two--complete histolysis of larval tissues and partial eversion of the juvenile trunk sac; stage three--larval gut pulled inside the juvenile trunk sac, but portions of the larval trunk epithelium not completely pulled into the juvenile body; stage four--all previous events plus the larval trunk epithelium completely pulled into the juvenile body.
In contrast to the labeled prototroch, there is not yet a distinct band of telotrochal label (Fig.
These include well-developed prototrochal and telotrochal bands, and a distinct neurotroch--a midventral cluster of cilia beginning posterior to the prototroch and terminating a short distance anterior to the telotroch.
A wide telotrochal band forms on the otherwise uniformly ciliated ball; there is no ciliated apical tuft.
A few closely spaced circular fibers also become visible in the telotrochal region.
1c), filling the gap between the developing circular muscles and telotrochal bands.