Petrocephalus degeni Boulenger, 1906 (resurrected species) (Figure 2, no. 27) Petrocephalus degeni Boulenger, 1906: 434; Whitehead and Greenwood 1959: 284 (synonymy with Petrocephalus catostoma catostoma). Type specimens. Holotype (unique): BMNH 1906.5.30.84 (studied). Type locality. Mouth of Katonga River, Lake Victoria (Uganda). Diagnosis. Preanal length, PAL 0.641 of SL; predorsal length, PDL 0.634 of SL; dorsal fin length, LD 0.155 of SL; anal fin length, LA 0.221 of SL; distance dorsal fin origin to end of caudal peduncle, pD 0.427 of SL; length of caudal peduncle, CPL 0.202 of SL; depth of caudal peduncle, CPD 0.369 of CPL; length of snout to centre of eye, LSc 0.258 of HL; length of snout to posterior orbital rim of eye, LSo 0.411 of HL; head length, HL 0.261 of SL; dorsal fin ray number, nD 19; anal fin ray number, nA 27; number of scales around caudal peduncle, SPc 12. Etymology. See title of Boulenger (1906): “... new Fishes discovered by Mr. E. Degen... ”. Remarks. “Easily distinguished from its congeners in the short dorsal fin originating above the first ray of the anal” (Boulenger 1906: 434). Distinguished from all other species by highest PAL / SL and lowest LSc / HL, in combination with low LD / SL, low LA / SL, rather high pD / SL.

Published as part of Kramer, Bernd, Bills, Roger, Skelton, Paul & Wink, Michael, 2012, A critical revision of the churchill snoutfish, genus Petrocephalus Marcusen, 1854 (Actinopterygii: Teleostei: Mormyridae), from southern and eastern Africa, with the recognition of Petrocephalus tanensis, and the description of five new species, pp. 2179-2258 in Journal of Natural History 46 (35 - 36) on pages 2235-2236, DOI: 10.1080/00222933.2012.708452, http://zenodo.org/record/4590828