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Pelomedusa subrufa olivacea |
Subspecies |
The genus Pelomedusa is comprised of a single species, Pelomedusa subrufa, with three subspecies previously recognized, P.s. subrufa, P.s. olivacea, and P.s. nigra (Bonin, Devaux, and Dupré, 2006; Ernst and Barbour, 1989). It is still strongly recommended that groups of the three subspecies continue to be housed separately in order to maintain the genetic identity of each of these forms until further genetic research is completed. Description: Often confused with Pelusios (right), Pelomedusa (left) are easily identified as lacking a plastral hinge that is well developed in all species of Pelusios. Pelomedusa commonlyreach a SCL of 12 - 20 cm with some individual reaching up to 30 cm. Coloration is variable throughout the species & subspecies. Carapace and head coloration includes beige, brown, or olive. The plastron is yellow, cream, or dark. Neck, limbs, and tail are gray brown to olive dorsally and yellowish to white ventrally. Sexual dimorphism does occur (see Husbandry section) with males possessing significantly larger tails; extending beyond the outer edge of the anal scutes when withdrawn while the tail of the female does not extend beyond the anal notch. Males exhibit a slight plastral concavity, females have flat plastrons. It should also be noted that males develop broader heads than females. Larger individuals (both sexes) begin to develop a slight concavity of the carapace along the vertebral scutes. |
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North African Helmeted Turtle P.s. olivacea (Schweigger, 1812) - pectoral scutes are widely separated by the femoral scutes. Range extends from Ethiopia and the Sudan, west to Nigeria and the Cameroons. |
Identification: Common African Helmeted Turtle P.s. subrufa (Lacepède, 1788) - pectoral scutes meet at the midline of the plastron. Range extends from Sudan to Ghana and southward to Western Cape Province as well as Madagascar. |
Black Helmeted Turtle P.s. nigra (Gray, 1863) - pectoral scutes meet at the midline of the plastron with dark triangles on the ventral surface of the marginals. Limited range extends from South Africa and in KwaZulu-Natal, from the Free State to Kimberly. |
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Pelomedusa subrufa subrufa |
Used with permission -Chris van der Walt, Centurion, South Africa - 2007 |
Note: Both P.s. subrufa (above and below left) and P.s. olivacea (below right) can exhibit dark seams on the ventral side of the marginals. These do not form the sharp triangular pattern seen on P.s. nigra. |
Carapacial color variation ranges from nearly black to light yellow in both subrufa and olivacea. Pictured below: P.s. subrufa (left) & P.s. olivacea (right) |
Within all subspecies the degree to which the pectoral scutes are joined or separated varies greatly. Often individuals of P.s. olivacea will exhibit pectoral scutes that are or appear to be touching. Most often this is due to a scute abnormality and may be linked to captive diets. One cannot rule out the overlap of the ranges of P.s. subrufa & s. olivacea and the possible crossbreeding of subspecies. |
The classic pectoral arrangement used for differentiating subspecies of P. subrufa. The variability of this trait raises questions to the existence of separate subspecies. Pictured below: P.s. subrufa (left) & P.s. olivacea (right) |
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