williamsi, Chromis Günther [A.] 1894:624, Pl. 56 (fig. C) [Proceedings of the Zoological Society of London 1893 (pt 4); ref. 2018] Lake Malawi [Lake Nyasa], southeastern Africa. Holotype (unique): BMNH 1893.1.17.6. •Valid as Pseudotropheus williamsi (Günther 1894) -- (Maréchal 1991:413 [ref. 20944], Stauffer & Kellogg 2001:146 [ref. 25895], Konings 2016:37 [ref. 34521], Stauffer et al. 2016:174 [ref. 34671], Li et al. 2016:379 [ref. 34737]). Current status: Valid as Pseudotropheus williamsi (Günther 1894). Cichlidae: Pseudocrenilabrinae. Distribution: Eastern Africa: Lake Malawi. Habitat: freshwater.