. Bulletin of the British Museum (Natural History). LAKE GEORGE HAPLOCHROM IS SPECIES 173 tip of premaxilla reaching a vertical through the anterior margin of the orbit or a Httle further Fig. 15. Haplochromis mylodon. Holotype. Gill rakers short and stout, the lower i or 2 reduced ; 7-9 (mode 7) rakers on the lower part of the first gill arch. The median row of pseudorakers on the first arch is well developed but individual pseudorakers are low. Scales. Ctenoid ; lateral line with 31 (), 32 () or 34 () scales, cheek with 3 (rarely 2) rows. Five to 7 (mode 5J) scales be
. Bulletin of the British Museum (Natural History). LAKE GEORGE HAPLOCHROM IS SPECIES 173 tip of premaxilla reaching a vertical through the anterior margin of the orbit or a Httle further Fig. 15. Haplochromis mylodon. Holotype. Gill rakers short and stout, the lower i or 2 reduced ; 7-9 (mode 7) rakers on the lower part of the first gill arch. The median row of pseudorakers on the first arch is well developed but individual pseudorakers are low. Scales. Ctenoid ; lateral line with 31 (), 32 () or 34 () scales, cheek with 3 (rarely 2) rows. Five to 7 (mode 5J) scales between the upper lateral line and the dorsal fin origin, 6-8 (mode 7) between the pectoral and pelvic fin bases. Fins. Dorsal with 14 (), 15 (), 16 () or 17 () spinous and 8 (), 9 () or 10 () branched rays. Caudal subtruncate, scaled on its basal half. Pectoral 27-6-33-3 (M = 29-5) per cent of standard length, 82-0-96-5 (M = 84-1) per cent of head. Pelvics with the first ray slightly produced. Teeth. Except for i to 3 unicuspids posteriorly in the upper jaw of most fishes, the outer teeth in both jaws are stout and unequally bicuspid ; the major cusp is almost equilateral in outline, moderately protracted and barely incurved. There are 32-46 (M = 40) teeth in the outer premaxillary row. The inner teeth are small and tricuspid, and are arranged in i or 2 rows in the upper jaw, and a single (rarely double) row in the lower one. Osteology. The neurocranium of H. mylodon is virtually identical with that of H. ishmaeli (or H. pharyngomylus) of Lake Victoria [see Greenwood i960). The shape and size of the facet for the upper pharyngeal bones is strictly comparable in all three species, as is the relative contribution to this facet of the basioccipital and parasphenoid bones. The lower pharyngeal hone is a massive structure (text-fig. 16). Compared with this bone in H. ishmaeli and H. pharyngomylus, that of H. mylodon is slightly less massive. The difference is n
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