@article {501, title = {Petrocephalus leo, a new species of African electric fish (Osteoglossomorpha: Mormyridae) from the Oubangui River basin (Congo basin)}, journal = {Zootaxa}, volume = {4121}, year = {2016}, month = {06/2016}, pages = {319-330}, type = {original}, chapter = {319}, abstract = {

A new species of the African weakly electric fish genus Petrocephalus (Osteoglossomorpha: Mormyridae: Petrocephalinae) is described from the Oubangui (Ubangi) River basin, the principal right-bank tributary of the Congo River. Petrocephalus leo sp. nov. is one of the most distinctive species of Petrocephalus as it combines (among other characteristics) the absence of electroreceptive rosettes on the head with a unique melanin pattern. Only four other species of Petrocephalus lack all electroreceptive rosettes: Petrocephalus microphthalmus, Petrocephalus haullevillii, Petrocephalus schoutedeni, and Petrocephalus zakoni. Petrocephalus leo sp. nov. can be distinguished from these four species in having a distinctive black mark at the base of the pectoral fins (versus absent in P. microphthalmus, P. haullevillii and P. schoutedeni) and no subdorsal black mark (versus present in P. zakoni). A phylogenetic analysis using mitochondrial cytochrome b gene sequences shows haplotypes of P. leo sp. nov. are distinct, but are unexpectedly nested within P. zakoni haplotypes, making this latter species paraphyletic. To investigate this conflict between morphology and mitochondrial cytochrome b, a nuclear marker, the first intron of the gene coding for the S7 ribosomal protein, was sequenced. The presence of four diagnostic indels between P. zakoni and P. leo sp. nov. sequences supports the reciprocal monophyly of these two species. This is the first reported case of conflict between morphology and mitochondrial phylogeny within the genus Petrocephalus. Finally, three species of Petrocephalus are reported for the first time from the Oubangui region bringing the total of Petrocephalus species in this region to 12.

}, keywords = {Africa, cytochrome b, fish, molecular phylogeny, morphology, nuclear S7 intron, Petrocephalinae}, doi = {http://doi.org/10.11646/zootaxa.4121.3.6}, author = {S{\'e}bastien Lavou{\'e}} } @article {481, title = {Cryptomyrus: a new genus of Mormyridae (Teleostei, Osteoglossomorpha) with two new species from Gabon, West-Central Africa}, journal = {ZooKeys}, volume = {561}, year = {2016}, month = {Aug-02-2016}, pages = {117 - 150}, abstract = {

Abstract
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.

R\ésum\é
Nous avons d\émontr\é avec des marqueurs mitochondriaux et nucl\éaires que trois sp\écimens de poissons mormyrid\és faiblement \électriques, collect\és \à trois localit\és au Gabon sur une p\ériode de 13 ans, forment une lign\ée inconnue au sein de la sous famille des Mormyrinae dont nous avons d\étermin\é la position phylog\én\étique. Nous d\écrivons un nouveau genre et deux nouvelles esp\èces pour ces trois sp\écimens. Cryptomyrus, nouveau genre, se distingue des autres genres de mormyrid\és par une combinaison de caract\ères de l\’\écaillure, morphom\étriques, et dentaires. Cryptomyrus ogoouensis, nouvelle esp\èce, se distingue de sa seule esp\èce cong\én\érique par sa nageoire anale qui commence nettement en avant de sa nageoire dorsale, son p\édoncule caudal gracile et les lobes de sa nageoire caudale pratiquement aussi longs que son p\édoncule caudal. Chez Cryptomyrus ona, nouvelle esp\èce, la nageoire anale commence l\ég\èrement en avant de l\’origine de la nageoire dorsale, le p\édoncule caudal est large, et les lobes de la nageoire caudale sont plus courts que le p\édoncule caudal. La d\écouverte ininterrompue de nouveaux taxa dans le \«clade de basse Guin\ée\» des Mormyridae illustre notre connaissance incompl\ète de la diversit\é des poissons de l\’ouest de l\’Afrique centrale. Nous pr\ésentons une cl\é r\évis\ée des genres de Mormyridae de basse Guin\ée.

}, keywords = {African freshwater fishes, DNA, electric organ discharge, EOD, integrative taxonomy, Mormyrinae, phylogeny, rarity, weakly electric fish}, issn = {1313-2989}, doi = {10.3897/zookeys.561.7137}, url = {http://zookeys.pensoft.net/articles.php?id=7137}, author = {John P Sullivan and S{\'e}bastien Lavou{\'e} and Carl D Hopkins} }