taxonomy, morphology and phylogeny

Evolutionary loss of parasitism by nematodes? Discovery of a free-living filaroid nematode

Publication Type:Journal Article
Year of Publication:2006
Authors:W. Bert, Messiaen, M., Manhout, J., Houthoofd, W., Borgonie, G.
Journal:Journal of ParasitologyJournal of Parasitology
ISBN Number:0022-3395
Keywords:Evolution, NEMATODE, nematodes, pool, SEQUENCE

A cattle-drinking pool in nature reserve "Zwin" on the Belgian coast contained free-living third-stage infective filaroid juveniles. These juveniles clearly differ morphologically from all known nematodes. Morphological and molecular analyses indicate a position within the Filaroidea. The aberrant biology of this nematode, namely. a free-living stage in ail aquatic environment. is unknown within this superfamily. and the evolution of the parasitic phenotype to a free-living state is generally thought to be unlikely. However, the obtained placement in the small subunit molecular phylogenetic tree suggests that this free-living stage is most likely a secondary adaptation. It is reasonable to assert that nematodes with complex life cycles still have the genetic potential for a reversion from parasitism to a (partial) free-living stage

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