. Bulletin of the British Museum (Natural History) Zoology. 72 PETER HUMPHRY GREENWOOD. Fig. 1 Tilapia arnoldi holotype in left lateral view. Actual standard length: mm. Dum.), T. ruweti (Poll and Thys) and O. mossambicus given by Jubb (1967) and by Bell-Cross and Minshull (1988). Specimens used for comparative purposes are: Tilapia arnoldi: holotype, South African Museum (SAM) 10862; now housed in the Albany Museum, Grahamstown, under that number. Tilapia rendalli: J. L. B. Smith Institute of Ichthyology, Grahamstown (RUSI) 26579; a single specimen from the Incomati river; RUSI 27988, 3
. Bulletin of the British Museum (Natural History) Zoology. 72 PETER HUMPHRY GREENWOOD. Fig. 1 Tilapia arnoldi holotype in left lateral view. Actual standard length: mm. Dum.), T. ruweti (Poll and Thys) and O. mossambicus given by Jubb (1967) and by Bell-Cross and Minshull (1988). Specimens used for comparative purposes are: Tilapia arnoldi: holotype, South African Museum (SAM) 10862; now housed in the Albany Museum, Grahamstown, under that number. Tilapia rendalli: J. L. B. Smith Institute of Ichthyology, Grahamstown (RUSI) 26579; a single specimen from the Incomati river; RUSI 27988, 3 specimens from the Sabi River, Kruger National Park. Tilapia ruweti: RUSI 30126, a single specimen from the Thamalakane River, Okovango, Botswana; 10 specimens from lot RUSI 30343, Gomoti system, Okovango, Botswana. Tilapia sparrmanii: RUSI 22600, 3 specimens from the Palala River, Limpopo River system at Muisvogelkraal 20° 00'S, 24° 30'E, Transvaal. Oreochromis mossambicus: RUSI 26135, 7 specimens from weir R2M 10, above Laing Dam (Fort Murray), Buffalo River system, Eastern Cape Province. All specimens of the four latter species are of approximately the same size as the type of T. arnoldi, and were chosen for that reason. REDESCRIPTION OF T. ARNOLDI HOLOTYPE The specimen is now in very poor condition (Fig. 1) having at some time been partially dried-out and suffered fairly extensive damage to the body and unpaired fins. It is also partly cleared since the alimentary tract is readily visible through the body wall. No trace of chromatophores remains on the body and fins, all of which are now a light caramel-brown in colour. Unfortunately the preserved coloration and colour- patterns as described by G & T are of no taxonomic value. The head is extensively damaged and almost detached from the body; the right operculum and suboperculum are missing, as is the entire lower jaw. Some branchiostegal rays have been lost on both sides, and the branchiostegal membrane is badly torn
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