. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. RIGIDITY OF PECTORAL FIN OF MAKAIRA INDIGA (GUVIER) 177 anterior dorsal process of cleithrum posterior dorsal process of .cleithrum marginal ray bases of fin rays lateral arm of cleithrum. dorsal process of coracoid coracoid ridge medial arm of cleithrum Fig. 7B. Articular region of pectoral girdle of Makaira audax. first two is an area of attachment rather than articulation, most movement taking place between their distal ends and the bases of the rays. The third and fourth radials are slightly more movable, and move
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. RIGIDITY OF PECTORAL FIN OF MAKAIRA INDIGA (GUVIER) 177 anterior dorsal process of cleithrum posterior dorsal process of .cleithrum marginal ray bases of fin rays lateral arm of cleithrum. dorsal process of coracoid coracoid ridge medial arm of cleithrum Fig. 7B. Articular region of pectoral girdle of Makaira audax. first two is an area of attachment rather than articulation, most movement taking place between their distal ends and the bases of the rays. The third and fourth radials are slightly more movable, and movement is possible between the second and third radials in all species. The distal ends of the first two radials are smoothly curved in M. audax, allowing free movement of the rays over them, but are strongly rugose and pitted in M. indica for the attachment of connective tissue. The last ten rays are movably articulated on the distal ends of the third and fourth radials in both species. In both M. audax and M. indica the pectoral fin is held to its articular surfaces by a connective tissue sheath, but this sheath shows significant differ- ences in the two species. In M. audax the ligaments are elastic and loosely arranged so as to allow maximum movement of the joint, but in M. indica a very strong sheath of interwoven fibrous tissue is developed which holds the fin strongly to its articular surfaces; the fibres are short and their area of attach- ment to the bone is more extensive than in M. 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 [etc. ] The Museu
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Keywords: ., bookauthorsouthafr, bookcentury1800, bookdecade1890, bookyear1898
