1. Brinkhurst, R.O., 1988. A taxonomic analysis of the Haplotaxidae. Can. J. Zool, 66: 2243?2252.
2. Brinkhurst, R.O., b. Ancestors. In Proceedings Wilhelm Michaelsen Memorial Symposium, Hamburg 1987. Mitt. hamb. zool. Mus. Inst., in press.
3. Brinkhurst, R.O. & A.F.L. Nemec, 1987. A comparison of phentic and phylogenetic methods applied to the systematics of Oligochaeta. In R.O. Brinkhurst & R.J. Diaz (eds) Aquatic Oligochaeta. Hydrobiologia 155: 65?74.
4. Clark, R.B., 1969. Systematics and Phylogeny: Annelida, Echiura, Sipuncula. Chemical Zoology 4: 1?68.
5. Dahm, A.G., 1962. Distribution and biological patterns of Acanthobdella peledina Grube from Sweden (Hirudinea, Acanthobdellae). Kungl. Fysiogr. Sallsk. Handl. 73: 4?35.