Pristina roboscidea and Pristine/letosbomi (Oligochaeta, Naididae) from a Freshwater Creek near Darwin, Northern Territory, Australia, with Descriptions of the Genital Organs of Both Species

Naidid oligochaetes from a freshwater creek feeding into West Arm, Darwin Harbour, were collected in July 1993.The majority of the worms were in different stages of sexual maturity.They represent two species, Pristina prohoscidea Beddard, 1896, and Pristinella osborni (Walton, 1906).In this paper, full descriptions of both somatic and genital features of these taxa are given.Taxonomic and phylogenetic aspects are discussed.