. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 14 ANNALS OF THE SOUTH AFRICAN MUSEUM (3) rhipidion: pseudorhipidion Definitions for both these structures have been given by Ishiyama (1958), who relates the smooth-surfaced, dorsally situated pseudorhipidion to the distal end of the dorsal marginal cartilage, while pointing out that the pitted, ventrally situated rhipidion is composed entirely of erectile tissue and has no relation to cartilaginous elements. Stehmann (1969), however, points out that Ishiyama is incorrect in his restriction of the t
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 14 ANNALS OF THE SOUTH AFRICAN MUSEUM (3) rhipidion: pseudorhipidion Definitions for both these structures have been given by Ishiyama (1958), who relates the smooth-surfaced, dorsally situated pseudorhipidion to the distal end of the dorsal marginal cartilage, while pointing out that the pitted, ventrally situated rhipidion is composed entirely of erectile tissue and has no relation to cartilaginous elements. Stehmann (1969), however, points out that Ishiyama is incorrect in his restriction of the term rhipidion to Raja species (1958) or Raja and Breviraja species (Ishiyama & Hubbs 1968), and pseudorhipidion to Bathyraja, since members of his clavata-group (subgenus Raja: Stehmann (1970)) possess a pseudorhipidion. The presence of a pseudorhipidion is therefore not a suitable character for the separation of the genus Bathyraja from other raj 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
