1. Baker, H. R., 1982. Two new Phallodriline genera of marine Oligochaeta (Annelida; Tubificidae) from the Pacific northeast. Can. J. Zool. 60: 2487–2500.
2. Baker, H. R. & R. O. Brinkhurst, 1981. A revision of the genus Monopylephorus and redefinition of the subfamilies Rhyacodrilinae and Branchiurinae ( Tubificidae: Oligochaeta). Can. J. Zool. 59: 936–965.
3. Braidotti, P., M. Ferraguti & T. P. Fleming, 1980. Cell junctions between spermatozoa flagella within the spermatozeugmata of Tubifex tubifex ( Annelida: Oligochaeta). J. Ultrastruct. Res. 73: 299–309.
4. Braidotti, P. & M. Ferraguti, 1982. Two sperm types in the spermatozeugmata of Tubifex tubifex ( Annelida, Oligochaeta). J. Morph. 171: 123–136.
5. Brinkhurst, R. O., 1982. Evolution in the Annelida. Can. J. Zool. 60: 1043–1059.