Petrocephalus longianalis is a species of electric fish in the family Mormyridae. It is found in the lower and upper Luapula River system in Zambia.Kramer, B., Bills, R., Skelton, P. & Wink, M. (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. Journal of Natural History, 46 (35-36): 2179-2258.
Size This species reaches a length of .
Etymology The fish's name means longus (L.), "long"; analis (L.), "anal", referring to higher number of anal-fin rays (30–35) compared with congeners covered in the authors' study.
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