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Smithiana Bulletin
The South African Institute for Aquatic Biodiversity
ISSN: 1684-4130
No. 8, 2008, pp. 41-52

Bioline Code: sm08003
Full paper language: English
Document type: Research Article
Document available free of charge

Smithiana Bulletin, No. 8, 2008, pp. 41-52

 en A survey of tail spine characteristics of stingrays frequenting African, Arabian to Chagos-Maldive Archipelago waters.
Schwartz, Frank J.

Abstract

Tail spine characteristics were examined of 51species (including one subspecies) of stingrays frequenting African, Arabian to Chagos-Maldive archipelago waters. Thirty-four species (313 males, 405 females) possessed intact spines, 12 species lacked tail spines. Spine characteristics recorded were: total length, prebase length, serrations (right and left), serrations or spaces on the spine base and if a dorsal groove was present. Spine total serrations ranged 36-261; spine serrations of males were usually more numerous than of females, sometimes twice as many. Total serration count seemed to be associated with stingray habitat and behavior, those of active open water rays have high counts, while benthic or freshwater ray species have low counts. Disk width, spine length, prebase length and presence of a dorsal groove is not correlated with size or type of stingray. Likewise the number of spine serrations does not increase in more derived genera. A combination of spine characteristics does, however, define a species. These features will help scientists, paleontologists and physicians identify a species.

Keywords
stingrays, tail spine serrations, Africa, Arabia

 
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