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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 5889

Kathryn A. Coates; Preliminary investigations of hybridization/reticulate evolution in Guaranidrilus (Enchytraeidae: Oligochaeta). Hydrobiologia 180:35-45, 1989

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The identification of gut diverticula at 7/8 as a synapomorphy and recognition of all taxa of Guaranidrilus has been obscured by losses of gut diverticula within the lineage. The homoplastic occurrence of basally unpaired peptonephridia in some enchytraeid species has similarly obscured the limits of Hemienchytraeus. Taxa with unpredictable relationships, morphogenic irregularities is some reproductive structures, and apparently, modified modes of reproduction, suggest the possibilities of hybridization between taxa with both close and distant relationships.