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- W2034707232 abstract "Insight into the evolution of class Secernentea (Nematoda) for the purpose of providing a phylogenetic context for the model Caenorhabditis elegans is being gained from the use of molecular character sets. Such phylogenies provide a framework for mapping the evolution of diversity in some early-development characters for 70 species and 19 families of Secernentea. These characters include (i) whether AB and P1 blastomeres initially develop at the same (synchronous) or different (asynchronous) rates, (ii) whether AB and P1 are initially aligned along the linear axis of the embryo (tandem pattern) or obliquely (rhomboidal pattern), and (iii) whether the founder germ cell, P4, is established early, i.e., by the sixth cleavage, or later. Evolutionary polarity of characters was evaluated through outgroup comparisons. From our data the following inferences are made. The derived character, late establishment of P4, evolved primarily in the ancestor of the monophyletic groups Diplogastrina, Rhabditina, and Panagrolaimidae. Asynchronous development is convergent, defining one clade of Tylenchina as well as Cephalobina, and also arising independently in Aphelenchina. The rhomboidal embryo is ancestral to the tandem-pattern embryo that defines a second clade of Tylenchina. Early-embryo characters are congruent with the polyphyly of Cephalobina and Aphelenchina, as has been demonstrated by molecular phylogenies. Many aspects of early embryogenesis, rather than being highly conserved, evolve at a rate appropriate to defining taxa within Secernentea." @default.
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- W2034707232 date "2001-01-01" @default.
- W2034707232 modified "2023-09-25" @default.
- W2034707232 title "Comparative survey of early embryogenesis of Secernentea (Nematoda), with phylogenetic implications" @default.
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- W2034707232 doi "https://doi.org/10.1139/z00-179" @default.
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