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Hydromedusa tectifera

Hydromedusa tectifera, Photo: Michael Lahanas

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Cladus: Archelosauria
Division: Pan-Testudines
Division: Testudinata
Ordo: Testudines
Infraordo: Pan-Pleurodira
Subordo: Pleurodira
Superfamilia: Chelidoidea

Familia: Chelidae
Subfamilia: Hydromedusinae
Genus: Hydromedusa
Species: Hydromedusa tectifera

Hydromedusa tectifera Cope, 1870
Holotype: BMNH 1947.3.5.85
Type locality: Uruguay (“Monte Video”)


Cope, E.D. 1870. Seventh contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc. 11 [1869]: 147–169
Hydromedusa tectifera – Taxon details on Integrated Taxonomic Information System (ITIS).

Vernacular names
čeština: Dlouhokrčka hadí, hadokrčka argentinská
English: Argentine snake-necked turtle
日本語: ギザミネヘビクビガメ
Nederlands: Argentijnse slangenhalsschildpad
português: Cágado-pescoço-de-cobra

The Argentine snake-necked turtle (Hydromedusa tectifera),[2] also known commonly as the South American snake-necked turtle[2] is a species of turtle in the family Chelidae. The species is known for the long neck to which its common names refer. Despite appearances, the Argentine snake-necked turtle is probably more closely related to the mata mata (Chelus fimbriatus) than to the Australian snake-necked turtles in the genus Chelodina.[3] H. tectifera is found in southern Brazil, and northern Uruguay, Paraguay, and Argentina.[4] Not much is known about it, as it has not been extensively researched.[5] It is a popular pet in the exotic pet trade.

Anatomy and morphology
An Argentine snake-necked turtle caught by mistake on a fishing hook in Brazil.
H. tectifera is in the middle left. To the right of it, face to face, is the mata mata (Chelus fimbriatus).

H. tectifera can reach up to 28 centimeters (11 inches) in straight carapace length. Its carapace is strongly keeled, and it can also be distinguished by black and yellowish markings along its head and neck. Generally, the females are larger than the males which often have larger tails.[3][6]
Natural history

The Argentine snake-necked turtle lives in slow-moving ponds, rivers, streams, and marshes, preferably with aquatic vegetation. In coastal areas, it will enter brackish water, and it may hibernate in colder areas of its distribution. It is carnivorous and eats snails, aquatic insects, fish, and amphibians. It attacks its prey with a combination of matamata-like vacuum suction and the stabbing neck motions of other snake-necked turtles.[3] Courtship and mating has not been extensively observed in this species, although it is known that nesting occurs in the spring at the riverbanks. The eggs are 34 mm × 22 mm (1.34 in × 0.87 in), white, and brittle-shelled. Hatchlings have a straight carapace length of about 34 mm (1.3 in), and have a carapace which is more wrinkled than that of an adult.[6]
See also

Turtles of South America


Fritz, Uwe; Havaš, Peter (2007). "Checklist of Chelonians of the World" (PDF). Vertebrate Zoology. 57 (2): 335. Archived from the original (PDF) on 2010-12-17. Retrieved 29 May 2012. Archived 2007-09-30 at the Wayback Machine URL accessed March 24, 2007. - Argentine Snake-necked Turtle URL accessed March 24, 2007.
Hydromedusa URL accessed March 28, 2007.

Turtles of the World Archived 2007-12-08 at the Wayback Machine URL accessed March 28, 2007.

Further reading

Cope ED (1869). "Seventh Contribution to the Herpetology of Tropical America". Proceedings of the American Philosophical Society 11: 147-192. (Hydromedusa tectifera, new species, pp. 147-148).

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