. Bulletin of the British Museum (Natural History). 6 E. TREWAVAS Series of scales on cheek 3-4; scales between origin of dorsal and lateral line 2^-3. Anal fin-rays III 7-8. Vertebrae 26 (3 specimens x-rayed). In some specimens one or more dark horizontal streaks on anterior part of body, the uppermost above and on the upper lateral line, others uneven, below it (see iig. 2). Five broad dark vertical bars present or absent. Known from three localities in the Congo basin—Monsembe on R. Congo, Karawa on a tributary of R. Mongala and R. Ja. P. nigrofasciatus Paratilapia nigrofasciata Pellegrin,
. Bulletin of the British Museum (Natural History). 6 E. TREWAVAS Series of scales on cheek 3-4; scales between origin of dorsal and lateral line 2^-3. Anal fin-rays III 7-8. Vertebrae 26 (3 specimens x-rayed). In some specimens one or more dark horizontal streaks on anterior part of body, the uppermost above and on the upper lateral line, others uneven, below it (see iig. 2). Five broad dark vertical bars present or absent. Known from three localities in the Congo basin—Monsembe on R. Congo, Karawa on a tributary of R. Mongala and R. Ja. P. nigrofasciatus Paratilapia nigrofasciata Pellegrin, 1900 : 353 (Nganchou, Congo, not far downstream from Kasai-Congo confluence). Pelmalochroinis nigrofasciatus (part.); Pellegrin, 1904 : 280, pi. vi fig. 2. Pelmatochromis ocellifer (nee Boulenger); Steindachner, 1914 : 57 fig. 12 (R. Ja); Gosse, 1963 : 230; Thys van den Audenaerde, 1967 : 93; id. 1968a : fig. 13. Paratilapia longipinuis Nichols & Griscom, 1917 : 728 fig. 29 (Congo at Coquilhatville and Irebu). Teeth (fig. 4). In a young fish of SL 22 mm only one row of teeth is present in the lower jaw and some of these are notched, others have one cusp and a shoulder; there are only a few upper inner teeth, and these (and others when they develop) have one sharp cusp and a pair of shoulders; most of them retain this shape but from SL about 100 mm some of them are replaced by conical teeth. Already at SL 38 mm there are no more notched teeth in the outer series, but the teeth are still flattened in section and shouldered; later the shoulder is lost and more and more of the outer teeth become conical. The last to retain a shoulder are the lateral teeth of the lower jaw, where the band may be a little wider and the teeth overlap obliquely; in large specimens these too become conical. The outer teeth are more numerous and close-set than in P. ocellifer, 54-64 in the upper jaw, 74 in a specimen of SL 116 mm. There are 4 rows in the upper jaw,. Please note that these images ar
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