253 PROCEEDINGS OF THE ^ CALIFORNIA ACADEMY OF SCIENCES Vol. 46, No. 6, pp. 151-178, 13 figs., 2 tables. August 24, 1989 SYSTEMATIC REVISION AND DESCRIPTION OF NEW SPECIES OF SUCKERMOUTH CATFISHES {CHILOGLANIS, MOCHOKIDAE) FROM CAMEROUN By ^ Tyson R. Roberts ' California Academy of Sciences, San Francisco, California 94118 Abstract: Ten species of Chiloglanis occur in Cameroun: C. batesii Boulenger, 1904 (all or almost all river basins); C. benuensis Daget and Stauch, 1963 (Niger); C. cameronensis Boulenger, 1904 (Lokunje, Kribi, Kienke, Ntem); C. rf/sne;/ Trewavas, 1974 (Mungo and Cross); C. harbinger new species (Lokunje); C. niger new species (Niger); C polypogon new species (Cross); C. reticulatus new species (Congo); C sanagaensis new species (Sanaga); and C. voltae Daget and Stauch, 1963 (Niger). Chiloglanis disneyi, C. harbinger, C. niger, C. polypogon, and C. sanagaensis are known only from Cameroun; C. benuensis occurs in the River Benue in Cameroun and Nigeria. Chiloglanis reticulatus also occurs in the Congo basin in northwestern Zaire. Chiloglanis batesii (including its synonym C. micropogon Poll, 1952) occurs in suitable habitats throughout the Niger and Congo basins, and is the only species of Chiloglanis known from the Chad basin. Chiloglanis cameronensis is the only species known in the Ogooue basin (Gabon). Chiloglanis voltae is also known from the Benue in Nigeria and the Volta basin (Ghana and Burkina Faso). In all of the major river systems of Cameroun two or even three species of Chiloglanis occur sympatrically. Sympatric species usually differ strongly in sucker morphology, number and length of barbels, dentition, coloration, adult size, and other characteristics. Secondary sexual dimorphism is marked in some species, apparently absent in others. Received September 22, 1987. Accepted January 9, 1989. y uensis Daget and Stauch, 1963; C cameronensis Boulenger, 1904; C disneyi TvQVJ2i\a.s, 1974; C Chiloglanis belongs to the endemic African micropogon VoW, 1952; and C vo/rae Daget and catfish family Mochokidae. Adults range in size Stauch, 1963. For a review of the literature on from about 18 to 100 mm standard length. The species of Chiloglanis and their distribution see sucker or oral disc is formed by the enlarged Daget etal. (1986). Two recent papers have dealt upper and lower lips. The maxillary barbels lie with Chiloglanis from parts of Cameroun: the free at the sides of the upper lip but the man-Camerounian portion of the Benue (Niger basin) dibular or mental (chin) barbels are largely in-by Daget and Stauch (1963), and the Mungo and corporated into the lower lip. Meme, small coastal streams in western Cam-A total of 34 species of Chiloglanis has been eroun, by Trewavas (1974). The results of these recognized, of which six have been reported from studies and my interpretations of them are in-Cameroun: C batesii Boulenger, 1904; C ben-corporated in the present paper. [151]
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