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We use mitochondrial and nuclear sequence data to show that three weakly electric mormyrid fish specimens collected at three widely separated localities in Gabon, Africa over a 13-year period represent an unrecognized lineage within the subfamily   Mormyrinae   and determine its phylogenetic position with respect to other taxa. We describe these three specimens as a new genus containing two new species.    Cryptomyrus   , new genus, is readily distinguished from all other mormyrid genera by a combination of features of squamation, morphometrics, and dental attributes.    Cryptomyrus   ogoouensis   , new species, is differentiated from its single congener,    Cryptomyrus   ona   , new species, by the possession of an anal-fin origin located well in advance of the dorsal fin, a narrow caudal peduncle and caudal-fin lobes nearly as long as the peduncle. In    C.   ona   , the anal-fin origin is located only slightly in advance of the dorsal fin, the caudal peduncle is deep and the caudal-fin lobes considerably shorter than the peduncle. Continued discovery of new taxa within the “Lower Guinea Clade” of   Mormyridae   highlights the incompleteness of our knowledge of fish diversity in West-Central Africa. We present a revised key to the mormyrid genera of Lower Guinea.

Cryptomyrus : a new genus of Mormyridae ( Teleostei , Osteoglossomorpha ) with two new species from Gabon, West-Central Africa