. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 42 ANNALS OF THE SOUTH AFRICAN MUSEUM unlike the cartilage in other rajid species. The cartilage is fan-shaped with a blade-like posterior margin, similar in shape to the accessory terminal in Rhinoraja odai and Rhinoraja longicauda (Ishiyama 1958: fig. 11). In all other rajids, the accessory terminal i cartilage is Y-shaped, although in Raja clavata, R. straeleni, R. miraletus and R. alba (Figs 24 e-h) there appears to be a single arm. Ishiyama (1958) has commented on the change firom a symmetrical
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 42 ANNALS OF THE SOUTH AFRICAN MUSEUM unlike the cartilage in other rajid species. The cartilage is fan-shaped with a blade-like posterior margin, similar in shape to the accessory terminal in Rhinoraja odai and Rhinoraja longicauda (Ishiyama 1958: fig. 11). In all other rajids, the accessory terminal i cartilage is Y-shaped, although in Raja clavata, R. straeleni, R. miraletus and R. alba (Figs 24 e-h) there appears to be a single arm. Ishiyama (1958) has commented on the change firom a symmetrical to an asymmetrical shape. Furthermore, Ishiyama (1958) has grouped the accessory terminal i according to the shape of the distal region of the cartilage. However, in this study the accessory terminal i has been grouped on the basis of general overall appearance. Excluding the species Bathyraja smithii, five types of cartilages can be identified in southern African rajids. In Raja pullopunctata, R. doutrei and R. lanceorostrata, the cartilage is of asymmetrical Y-shape, with the posterior arm varying from elongate and pointed {R. doutrei, Fig. 24 b) to a small blunt process {R. pullopunctata. Fig. 24 d).. Fig. 25. Ventral view of accessory terminal i cartilage. Scale 1,0 cm. a. Cruriraja parcomaculata; a^. C. parcomaculata (dorsal view); b. C. triangularis; b^ C. triangularis (dorsal view); c. Rhinobatos annulatus; d. Anacanthobatis marmoratus; e. A, americanns; f. Cruriraja Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
