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- W2091255780 endingPage "447" @default.
- W2091255780 startingPage "401" @default.
- W2091255780 abstract "The embryology of sipunculans, entoprocts, nemertines, platyhelminths (excluding acoelomorphs), rotifers, ectoprocts, phoronids, brachiopods, echinoderms and enteropneusts is reviewed with special emphasis on cell-lineage and differentiation of ectodermal structures. A group Spiralia comprising the four first-mentioned phyla plus annelids and molluscs (discussed in Nielsen 2004. J Exp Zool (Mol Dev Evol) 302B:35–68) seems well defined through the presence of spiral cleavage with early blastomere specification, prototroch with characteristic cell-lineage, cerebral ganglia developing from cells of the first micromere quartet (i.e., the episphere) and a ventral nervous system developing from the hyposphere. The planktotrophic trochophore was probably the larval type of the ancestor of this group. Another group comprising phoronids, brachiopods, echinoderms and enteropneusts appears equally well delimited. It is characterized by radial cleavage with late blastomere specification, possibly by the presence of a neotroch consisting of monociliate cells, by the absence of cerebral ganglia and of a well-defined brain and paired longitudinal nerve cords developing in connection with the blastopore, and by coelomic organization. Its ancestral larval type was probably a dipleurula. Several characters link rotifers with the spiralians, although they do not show the spiral pattern in the cleavage. Ectoprocts are still a problematic group, but some characters indicate spiralian affinities. J. Exp. Zool. (Mol. Dev. Evol.) 304B, 2005. © 2005 Wiley-Liss, Inc." @default.
- W2091255780 created "2016-06-24" @default.
- W2091255780 creator A5044539111 @default.
- W2091255780 date "2005-01-01" @default.
- W2091255780 modified "2023-10-01" @default.
- W2091255780 title "Trochophora larvae: cell-lineages, ciliary bands and body regions. 2. Other groups and general discussion" @default.
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