Photographs of the collection localities of the three mormyrid specimens treated in this study. A Doumé falls on the Ogooué River, Ogooué-Lolo, Gabon, type locality of Cryptomyrus ogoouensis sp. n. during high water in May 2011 B same locality in low water, September 2014 C Nyanga River at confluence with Moukalaba River near collection site of holotype of Cryptomyrus ona sp. n., July 2001 D Collection site of Cryptomyrus ona specimen CUMV 98647 in Mabounié River, Ngounié Province, February 2012.