By Perry C. Holt (auth.), J. L. Kaster (eds.)

ISBN-10: 9400923937

ISBN-13: 9789400923935

ISBN-10: 9401075778

ISBN-13: 9789401075770

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Craggi type M as well as M. craggi type H; and Hemienchytraeus brasiliensis. There is no recent phylogenetic analysis to which the clades found here can be compared. Cernosvitov's (1937) classification anticipated some of these but large numbers of species have been described since and the discussion of generic relationships made by Cernosvitov indicated that his subfamilies, especially Achaetinae, and some genera were not conceived as monophylies. Phylogenetic analyses eventually should allow evolutionary investigations of Enchytraeidae to proceed within a theoretically consistent framework and allow the logical reclassification of species in nominal genera such as Marionina.

As well, intraspecific and interspecific variation are poorly analyzed. From an original wet terrestrial habitat, it seems that enchytraeids have invaded many habitats (120-123) more than once. Derived habitats are generally characteristic of genera or other higher-level, subfamilial taxa, for example, Lumbricillus, its immediate plesiomorph sisters, and more apomorph enchytraeids are characteristically littoral. The characters used were often unambiguously 30 diagnostic at specific ranks although homoplasious (sometimes with very low individual consistencies) overall.

H. , San Francisco. , 1980. Evolutionary polarity of character states. Ann. Rev. Eco!. , II: 333-358. , 1981. Phylogenetics. The theory and practice of phylogenetic systematics. John Wiley and Sons, New York. Hydrobiologia 180: 35-45, 1989. 35 J. L. ) Aquatic Oligochaete Biology. © 1989 Kluwer Academic Publishers. Preliminary investigations of hybridization/reticulate evolution in Guaranidrilus (Enchytraeidae: Oligochaeta) Kathryn A. Coates Department of Invertebrate Zoology, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, Canada M5S 2C6 Key words,' phylogenetics, reticulate evolution, Enchytraeidae Abstract 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.

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Aquatic Oligochaete Biology: Proceedings of the 4th International Symposium on Aquatic Oligochaete Biology by Perry C. Holt (auth.), J. L. Kaster (eds.)

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