A New Genus of African Loach Catfish (Siluriformes: Amphiliidae) from the Congo River Basin, the Sister-Group to All Other Genera of the Doumeinae, with the Description of Two New Species
Autors
Carl J. Ferraris, Jr., Richard P. Vari, and Paul H. Skelton
Fig. 1. Congoglanis alula, CU 91469, 96 mm SL, Central African Republic, Ouaka Prefecture, Congo River basin, Oubangui River drainage, Mbourou River rapids within AXMIN Ndassima mining concession, 6u139000N, 20u459390E.
Abstract
Congo River basin catfishes previously identified as Doumea alula (Amphiliidae, Doumeinae) were found to include three species that belong not to the genus Doumea but are, instead, the sister-group to a clade formed by all remaining Doumeinae. The species are assigned to a new genus, Congoglanis. Characters delimiting the Doumeinae and the clade consisting of all members of the subfamily except Congoglanis are detailed.
Fig. 3. Map of central Africa, showing Congo River system, with localities of species of Congoglanis indicated: C. inga (triangle), C. alula (circles), and C. sagitta (squares). Open symbols indicate type localities.
Congoglanis alula is distributed throughout much of the Congo River basin; C. inga, new species, is known only from the lower Congo River in the vicinity of Inga Rapids; and C. sagitta, new species, occurs in the Lualaba River basin of Zambia in the southeastern portion of the Congo River system.
Fig. 4. Congoglanis sagitta, new species, holotype, CU 96001, 83 mm SL, Zambia, Luapula Province, Congo River basin, Luapula River drainage, Mulembo River at bridge on Mansa-Serenge road, 12u329340S, 30u239240E.
CATFISHES of the subfamily Doumeinae of the Amphiliidae inhabit rapidly flowing rivers and streams across a broad expanse of tropical Africa. Recent studies of the Doumeinae documented that the species diversity and morphological variability within the subfamily are greater than previously suspected (Ferraris et al., 2010). As part of a continuing study of the Doumeinae, we examined extensive series of specimens from throughout the Congo River basin that conformed to the previous concept of Doumea alula (Fig. 1). Our examination revealed that the specimens actually represented more than onespecies and that all of those species lacked some of the characters considered diagnostic of the Doumeinae.
Fig. 5. Congoglanis inga, new species, holotype, MCZ 169063, 91 mm SL, Democratic Republic of the Congo, Congo River near Inga I Dam, 5u319300S, 13u379300E.
The objective of this report is to reevaluate the limits and defining features of Doumea and the Doumeinae, name a new genus to accommodate Doumea alula and its related species, redefine and redescribe D. alula, describe and name the two newly discovered species, and provide a summary of the distribution of species of the new genus within the Congo River basin.
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