Vanderhaege's toad-headed turtle (''Mesoclemmys vanderhaegei'') is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

turtle Turtles are an order of reptiles known as Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked tu ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Chelidae Chelidae is one of three living families of the turtle suborder Pleurodira, and are commonly called Austro-South American side-neck turtles. The family is distributed in Australia, New Guinea, parts of Indonesia, and throughout most of South Amer ...

. The species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

Etymology

The specific name, ''vanderhaegei'', is in honor of

Maurice Vanderhaege Maurice may refer to: People *Saint Maurice (died 287), Roman legionary and Christian martyr *Maurice (emperor) or Flavius Mauricius Tiberius Augustus (539–602), Byzantine emperor *Maurice (bishop of London) (died 1107), Lord Chancellor and Lo ...

, who is an expert in breeding reptiles in terraria.Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. . (''Mesoclemmys vanderhaegei'', p. 272).

Description

''M. vanderhaegei'' may grow to a

carapace A carapace is a Dorsum (biology), dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tor ...

length of . The ellipsoidal carapace, 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.

Habitat and geographic range

''Mesoclemmys vanderhaegei'' is known only from densely vegetated rivers and swamps in southern

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

Paraguay Paraguay (; ), officially the Republic of Paraguay ( es, República del Paraguay, links=no; gn, Tavakuairetã Paraguái, links=si), is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to th ...

, and northern

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

; possibly it also occurs in

Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...

and

Uruguay Uruguay (; ), officially the Oriental Republic of Uruguay ( es, República Oriental del Uruguay), is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast; while bordering ...

Natural history

Vanderhaege's toad-headed turtle is little known. ''M. vanderhaegei'' is diurnally active and carnivorous, and was characterized by Cei (1993) as aggressive, with a ferocious temper.

Reproduction

Cei (1993) reports that the ellipsoidal eggs of ''M. vanderhaegei'' are .

Taxonomy

''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).

Conservation status

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

References

External links

*Tortoise & Freshwater Turtle Specialist Group (1996).
''Phrynops vanderhaegei''

2006 IUCN Red List of Threatened Species.
Downloaded on 29 July 2007. {{Taxonbar, from=Q2701074 Mesoclemmys Turtles of South America Reptiles of Argentina Reptiles of Bolivia Reptiles of Brazil Reptiles of Paraguay Reptiles of Uruguay Reptiles described in 1973 Taxonomy articles created by Polbot