Vanderhaege's toad-headed turtle

Vanderhaege's toad-headed turtle
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Pleurodira
Family: Chelidae
Subfamily: Chelinae
Genus: Mesoclemmys
Species: M. vanderhaegei
Binomial name
Mesoclemmys vanderhaegei
Bour, 1973[1]
Synonyms[2][3]

The Vanderhaege's toad-headed turtle (Mesoclemmys vanderhaegei) is a species of turtle in the Chelidae family.

It is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay.

Recognition

The ellipsoidal carapace (to 27 cm), similar to that of M. gibbus but with a low medial groove, is somewhat serrated with a shallow subcaudal notch, and usually broadest at the 8th marginals and highest on the 3rd vertebral. Some rough striations may occur on the scutes. Vertebrals are broader than long. The carapace is brown to gray or black. The plastron covers much of the carapacial opening, is slightly upturned anteriorly, and is posteriorly notched. The intergular scute completely separates the gulars, but not the humerals, and is slightly shorter than, or about the same length as, its distance from the abdominals. The plastral formula is variable, but the femoral, abdominal and intergular scutes are usually longest. The plastron is yellow with a brown to black pattern which usually extends between the pectorals and femorals. Head and neck are considerably shorter than the carapace. The snout slightly protrudes and the upper jaw is neither notched nor serrated. Head and neck are gray, throat and chin yellow, and the yellowish upper jaws are seldom marked with dark pigment. Some orange vermiculations may occur on the head, and the lower jaw may be red. Other skin is gray to olive, and there is a fringe of large scales on the outer border of the forelimbs. Males have slightly longer, thicker tails with the vent nearer the tip, and a deep plastral notch. Females have a shallow plastral notch.

Distribution and habitat

Mesoclemmys vanderhaegei is known only from densely vegetated rivers and swamps in southern Brazil, Paraguay, and northern Argentina; possibly it also occurs in Bolivia and Uruguay.

Natural history

Vanderhaege's toad-headed turtle is little known. Cei (1993) reports its ellipsoidal eggs are 35 x 28 mm. M. vanderhaegei is diurnally active and carnivorous, and was characterized by Cei (1993) as aggressive, with aferocious temper.

Remarks

Mesoclemmys vanderhaegei is closely related to M. gibbus, and may even be a subspecies of that species. It was first described by Bour (1973) as a subspecies of the broad-headed M. tuberculatus, but was raised to full species rank by Bour and Pauler (1987).

IUCN Red List Status (1996) Lower risk: near threatened.

Sources

Notes

  1. ↑ Bour, Roger. 1973. Contribution à la connaissance de Phrynops nasutus (Schweigger: 1812) et Phrynops tuberculatus (Luederwaldt: 1926). Description d’une nouvelle sous-espèce originaire du Paraguay, Phrynops tuberculatus vanderhaegei (Testudinata – Pleurodira – Chelidae). Bulletin de la Société Zoologique de France 98(1):175–190.
  2. ↑ Fritz Uwe; Peter Havaš (2007). "Checklist of Chelonians of the World". Vertebrate Zoology 57 (2): 339–340. ISSN 1864-5755. Archived from the original (PDF) on 2010-12-17. Retrieved 29 May 2012.
  3. ↑ Peter Paul van Dijk, John B. Iverson, H. Bradley Shaffer, Roger Bour, and Anders G.J. Rhodin. 2012. Turtles of the World, 2012 Update: Annotated Checklist of Taxonomy, Synonymy, Distribution, and Conservation Status. Chelonian Research Monographs No. 5, pp. 000.243–000.328.

Sources

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