Abstract
In phylogenetic considerations of the Oligochaeta and the family Enchytraeidae, Propappus has been considered the ancestral or even the archetypal enchytraeid genus. Three nominal species are presently included in Propappus Michaelsen, 1905, P. volki Michaelsen, 1916, P. arhyncotus Sokolskaja, 1972, and the type species of the genus, P. glandulosus Michaelsen, 1905. Examination of type material of P. glandulosus and P. volki, as well as other material of the latter, showed that these species have a single pair of testes in segment XI and a single pair of ovaries in segment XIII. According to current classifications of the Oligochaeta, these species of Propappus cannot be retained in the Enchytraeidae. A phylogenetic analysis including two species of Propappus and 29 species of Haplotaxidae suggest a sister group relationship between Propappus and some Enchytraeidae and Haplotaxidae.
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Coastes, K.A. Phylogenetics of some Enchytraeidae (Annelida: Oligochaeta): A preliminary investigation of relationships to the Haplotaxidae. Hydrobiologia 155, 91–106 (1987). https://doi.org/10.1007/BF00025634
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DOI: https://doi.org/10.1007/BF00025634