xanstomachus, Pseudotropheus Stauffer [J. R., Jr.] & Boltz [J. M.] 1989:8, Figs. 1, 2b [Proceedings of the Biological Society of Washington v. 102 (no. 1); ref. 16284] Nakantenga Island, Lake Malawi [Lake Nyasa], Malawi, Africa, depth 3-7 meters. Holotype: USNM 297268. Paratypes: USNM 297269-70 (11, 4) •Valid as Pseudotropheus xanstomachus Stauffer & Boltz 1989 -- (Maréchal 1991:413 [ref. 20944]). •Valid as Metriaclima xanstomachus (Stauffer & Boltz 1989) -- (Stauffer et al. 1997:193 [ref. 23216], Konings & Stauffer 2006:233 [ref. 28844], Ciccotto et al. 2011:23 [ref. 31119], Stauffer et al. 2013:103 [ref. 32703], Konings 2016:64 [ref. 34521]). •Valid as Maylandia xanstomachus (Stauffer & Boltz 1989) -- (Ufermann 2001:61 [ref. 30286]). Current status: Valid as Maylandia xanstomachus (Stauffer & Boltz 1989). Cichlidae: Pseudocrenilabrinae. Distribution: Eastern Africa: Lake Malawi. Habitat: freshwater.