. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 28. \'entral \-iew of accessory^ terminals 3 and 4. Scale 2,0 cm. a. Raja clavata; b. R. straeleni; c. R. miraletus. Vertebral Count Vertebral numbers have been employed as taxonomic characters in teleosts (Bailey & Gosline 1955; Lagler et al. 1962). Their possible use in elasmobranch taxonomy was reviev/ed by Springer & Garrick (1964), while their species specificity in Japanese rajids has been investigated by Ishiyama (1952, 1958) and in European rajid species by Stehmann (1970). Verte
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 28. \'entral \-iew of accessory^ terminals 3 and 4. Scale 2,0 cm. a. Raja clavata; b. R. straeleni; c. R. miraletus. Vertebral Count Vertebral numbers have been employed as taxonomic characters in teleosts (Bailey & Gosline 1955; Lagler et al. 1962). Their possible use in elasmobranch taxonomy was reviev/ed by Springer & Garrick (1964), while their species specificity in Japanese rajids has been investigated by Ishiyama (1952, 1958) and in European rajid species by Stehmann (1970). Vertebral counts for South African west and south coast Rajidae have been given by Hulley (1970). Krefft (1968(2) has analysed the terminology, and has proposed a standard method for distinguishing the various groups of vertebrae. In rajids, the vertebrae may be divided into two groups, trunk (Vtr) and predorsal caudal (Vprd) vertebrae, of which the latter appears to be more suitable for taxonomic purposes. The number of predorsal caudal vertebrae is not species specific (Ishiyama, 1958), although the count may, in some cases, be used to distinguish between closely related species (Hulley 1970; Stehmann 1970). Interpreting the predorsal caudal count according to the method of Hubbs & Hubbs (1953), Ishiyama (1958) recognizes two forms of rajids, the 'northern' form {Bathyraja and Rhinoraja) with more than 61-62 Vprd, and the 'southern' form {Raja) with less than 61-62 Vprd. Stehmann (1970) can find no clear-cut distinction between the two genera, Bathyraja and Raja, in European species, but. 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
Size: 1624px × 1539px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
