THE SERRANOCHROMINE GENERA REVIEWED 



35 



the bone's medial aspect, from the midpoint of the vertical 

 projection to the posterior point on the maxilla's posterior 

 margin (see Fig. 1). 



Fig. 1. Medial aspect of maxilla (from Serranochromis 

 macrocephalus), viewed somewhat dorsolaterally, to show points 

 of measurement for: A, preshank length, and B, shank length. 

 Scale bar = 5 mm. 



The length of the premaxilla's ascending process is mea- 

 sured, directly, from the dentigerous surface of the bone at its 

 symphysis with the premaxilla of the opposite side, to the 

 dorsal tip of the process. The length of the alveolar process 

 uses the same ventral (i.e. dentigerous surface) reference 

 point; its dorsal limit being the highest point on the dorsal 

 margin of the process (see Fig. 2). 



STUDY MATERIAL 



See Greenwood (1979, 1984, 1992) for specimens used in 

 previous studies of Serranochromis, Sargochromis, Chetia 

 and Pharyngochromis . Additional material: 



Sargochromis coulteri RUSI 26627 '. Namibia (4 specimens) 

 Sargochromis coulteri RUSI 36419. Namibia (1 specimen) 

 Sargochromis coulteri RUSI 28106. Namibia (1 specimen) 

 Sargochromis giardi RUSI 35782. Zambia (3 specimens) 

 Sargochromis carlottae RUSI 31204 Namibia (3 specimens) 

 Sargochromis carlottae RUSI 31214 Namibia (2 specimens) 

 Sargochromis coulteri RUSI 31199. Namibia (1 specimen) 

 Serranochromis robustus RUSI 31169. Botswana; Okavango 



river (1 specimen) 

 Serranochromis thumbergi RUSI 22660. Dam, Empangeni 

 area, Natal R.S.A. (1 specimen presumably an introduc- 

 tion) 

 Serranochromis longimanus RUSI 23877. Botswana; Oka- 

 vango swamps (6 specimens) 

 Serranochromis macrocephalus RUSI 24175. Botswana; Boro 



river (9 specimens) 

 Serranochromis angusticeps RUSI 26854. Okavango swamps 



(4 specimens) 



Chetia brevis Holotype AMG. P. 951. Lomati river, R.S.A. 

 Chetia brevis Paratypes AMG. P. 952. Lomati river, R.S.A. 



(5 specimens) 

 Chetia brevis AMG. P. 1422. Lomati river, Barbeton district, 



R.S.A. (3 specimens, one partly skeletonized; see below) 

 Chetia flaviventris AMG. P. 1298. Mogel river, Waterberg, 



R.S.A. (7 specimens, one partly skeletonized; see below) 

 Chetia flaviventris AMG. P. 6871. Tweeport, Rustenburg 

 district, Limpopo system, R.S.A. (10 specimens) 



Fig. 2. Frontal view of left and right premaxillae (from 

 Serranochromis macrocephalus) to show points of measurement 

 for: A, height of ascending process, B, height of alveolar process. 

 Scale bar = 5 mm. 



Chetia flaviventris Palala river at Muisvogelkraal (24° 00'S, 



28° 24' 30"E) R.S.A. (5 specimens) 

 Chetia mola Holotype. ROM 29825. Luonga river (Zaire 



drainage), Zambia 



Skeletal material 



Pharyngochromis acuticeps RUSI 36553. Okovango river 



(see also Greenwood, 1992) 

 Sargochromis carlottae RUSI 31204. Namibia 

 Sargochromis carlottae RUSI unregistered. 142 mm S.L. 

 Sargochromis giardi RUSI unregistered 210 mm S.L. 

 Sargochromis giardi RUSI unregistered 244 mm S.L. 

 Sargochromis cfSargo. greenwoodi RUSI unregistered 

 Serranochromis macrocephalus RUSI 24175. Botswana, Boro 



river 

 Serranochromis macrocephalus RUSI unregistered 107 mm 



S.L. 

 Serranochromis macrocephalus RUSI unregistered 220 mm 



S.L. 

 Serranochromis macrocephalus RUSI unregistered ca 



220 mm S.L. 

 Serranochromis angusticeps RUSI unregistered 220 mm S.L. 

 Serranochromis angusticeps RUSI unregistered 230 mm S.L. 

 Serranochromis angusticeps RUSI unregistered 410 mm S.L. 

 Serranochromis longimanus RUSI unregistered 150 mm S.L. 

 Chetia flaviventris AMG P. 1298. Mogel river, Waterberg, 



R.S.A. 

 Chetia brevis AMG P. 1422. Lomati river, R.S.A. 



Institutional abbreviations: 



AMG 

 ROM 

 RUSI 



Albany Museum, Grahamstown 

 Royal Ontario Museum, Toronto 

 J.L.B. Smith Institute of Ichthyology, Graham- 

 stown 



