Is there molecular evidence for a close relationship of Nematoda with Gastrotricha?тезисы доклада

Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.

Работа с тезисами доклада


[1] Is there molecular evidence for a close relationship of nematoda with gastrotricha? / N. B. Petrov, O. G. Manylov, V. V. Aleshin et al. // Rus J. Nematology. Abstr. III Engl. Language Int. Symp. of the Rus. Society of Nematologists. — Vol. 8. — Russian Society of Nematologists Moscow, 2000. — P. 96–96. Cladistic analysis of morphological characters suggest the Nematoda to be a sister group of the Gastrotricha. Conversely, recent analyses of 18S rRNA gene sequences place the Nematoda in a hypothetical clade of molting animals Ecdysozoa, or cluster them with Chaetognatha, whereas the Gastrotricha represented by the specialized order Chaetonotida, are placed outside these groups. Toresolve this controversy, we re-examined the relationship of the Nematoda with other taxa, using additionally the 18S rRNA gene sequence of Turbanella cornuta, a species from the gastrotrich order Macrodasyida. Depending on taxon sampling, the Nematoda and Gastrotricha moved from basal to apical position in the 18S rRNA trees,but only occasionally appeared as sister groups. The greatest number of apomorphies in 18S rRNA sequences shared with Nematoda was observed in Gnathostomulida, Chaetognatha, and Ecdysozoa. However, these characters do not form a clearly distinguishable common synapomorphic complex, being randomly distributed among all these taxa. Thus, the 18S rRNA gene data do not support a close relationship of Nematoda with Gastrotricha.

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