A species of haplochromine cichlid fish of the genus Diplotaxodon Trewavas, endemic to Lake Malaŵi is described: Diplotaxodon dentatus, new species. All eight type specimens were trawled together off Thumbi East Island in the Southeastern arm of the lake at 73 meters in 1985. They were initially identified as D. argenteus because the teeth on the oral jaws were fully exposed with a closed mouth. The shorter snout length of D. dentatus (26.6–29.2 % HL) clearly separates it from D. argenteus (31.7–34.2 % HL). A plot of a principal components analysis further supports the separation of D. dentatus from D. argenteus.
Bookstein, F.L., Chernoff, B., Elder, R., Humphries, J., Smith, G.R. & Strauss, R. (1985) Morphometrics in evolutionary biology. Proceedings of the Academy of Natural Sciences of Philadelphia. Special Publication 15. Academy of Natural Sciences of Philadelphia, Pennsylvania, 277 pp.
Burgess, W.E. & Axelrod, H.R. (1973) New cichlids from Lake Malaŵi. Tropical fish Hobbyist, 22, 87–98.
Eccles, D.H. & Trewavas, E. (1989) Malaŵian cichlid fishes: the classification of some haplochromine genera. Lake Fish Movies, Herten, 335 pp.
Humphries, J.M., Bookstein, F.L., Chernoff, B., Smith, G.R., Elder, R.L. & Poss, S.G. (1981) Multivariate discrimination by shape in relation to size. Systematic Zoology, 30, 291–308.
Konings, A.F. (2007) Malawi cichlids in their natural habitat. 4th Edition. Cichlid Press, El Paso, Texas, 424 pp.
Konings, A.F. & Stauffer, J.R. Jr. (2006) Revised diagnosis of Metriaclima (Teleostei: Cichlidae) with description of a new species from Lake Malaŵi National Park, Africa. Ichthyological Exploration of Freshwaters, 17, 233–246.
Stauffer, J.R. Jr., Geerts, M., Konings, A.F., McKaye, K.R. & Black, K. (2007) Cichlid fish diversity and speciation. In: Hodkinson, T.R. & Parnell, J.A.N. (Eds.), Reconstructing the tree of life: taxonomy and systematics of species rich taxa. Systematics Association Special Series, 72, pp. 213–225.
Stauffer, J R. Jr. & Hert, E. (1992) Pseudotropheus callainos, a new species of mbuna (Cichlidae), with analyses of changes associated with two intra-lacustrine transplantations in Lake Malaŵi, Africa. Ichthyological Explorations of Freshwaters, 3, 253–262.
Stauffer, J.R. Jr. & McKaye, K.R. (1986) Description of a paedophagous deep-water cichlid (Teleostei: Cichlidae) from Lake Malaŵi, Africa. Biological Society of Washington, 99, 29–33.
Stauffer, J.R. Jr., Phiri, T.B. & Konings, A.F. (2018) Description of two deep-water fishes of the genus Diplotaxodon from Lake Malaŵi, Africa. Biological Society of Washington, 131, 90–100.
Turner, G.F. (1994) Description of a commercially important pelagic species of the genus Diplotaxodon (Pisces: Cichlidae) from Lake Malaŵi, Africa. Journal of Fish Biology, 44, 799–807.
Turner, G.F., Robinson, R.L., Shaw, P.W. & Carvalho, G.R. (2004) Identification and Biology of Diplotaxodon, Rhamphochromis, and Pallidochromis. In: Snoeks, J. (Ed.), The cichlid diversity of Lake Malaŵi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, Texas, pp. 198–251.
Turner, G.F. & Stauffer, J.R., Jr. (1998) Three new deep water cichlid fishes of the genus Diplotaxodon from Lake Malaŵi, with a redescription of Diplotaxodon ecclesi. Ichthyological Exploration of Freshwaters, 8, 239–252.
Trewavas, E. (1935) A synopsis of the cichlid fishes of Lake Nyasa. Annals and Magazine of Natural History, 10, 65–118.