Morrow, E. H. How the sperm lost its tail: the evolution of aflagellate sperm. Biological Reviews 79, 795 - 814 (2004).

Kramer, B., van der Bank, F. Herman & Wink, M. Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species, H. szaboi (Mormyridae). Zoologica Scripta 33, 1 - 18 (2004).

der Emde, von. Distance and shape: perception of the 3-dimensional world by weakly electric fish. Journal of Physiology Paris 98, 67-80 (2004).

Moller, P., Schugardt, C. & Kirschbaum, F. Permanent and seasonal expressions of sexual dimorphisms in a weakly electric fish, Mormyrus rume proboscirostris Boulenger 1898 (Mormyridae, Teleostei). Environmental Biology of Fishes 70, 175?184 (2004).

Lavoué, S., Hopkins, C. D. & A. Toham, K. The Petrocephalus (Pisces, Osteoglossomorpha, Mormyridae) of Gabon, Central Africa, with description of a new species. Zoosystema 26, 511-535 (2004).

Sullivan, J. P., Lavoué, S., Arnegard, M. E. & Hopkins, C. D. AFLPs resolve phylogeny and reveal mitochondrial introgression within a species flock of African electric fish (Mormyroidea: Teleostei). Evolution 58, 825-841 (2004).