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Pseudotomodon trigonatus

False Tomodon Snake


Pseudotomodon trigonatus

(Leybold, 1873)
Culebra de Monte Ocelada

Family: Colubridae
Order: Squamata
Class: Reptilia
Phylum / Division: Chordata
Kingdom: Animalia

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Records from Río Negro


Description


The false tomodon snake (Tachymenis trigonatus) is a species of venomous snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Argentina.

Taxonomy: Tachymenis trigonatus is part of the 36 species of the tribe Tachymenini.

Geographic distribution: Tachymenis trigonatus is found in the western and southern regions of the Monte Desert in western Argentina.

Habitat: The preferred natural habitat of Tachymenis trigonatus is shrubland.

Characteristics: The false tomodon snake is characterized by its coloration and number of scales. As part of the genus Tachymenis, it has morphological characters of maxillary teeth with grooved fangs, and a vertical pupil. The false tomodon snake has eight or fewer maxillary teeth. The body is marked dorsally by a distinguishing yellowish vertebral line. The dorsal scales are arranged in 19 rows at midbody. Adults have a total length (tail included) of about .

Behavior: Tachymenis trigonatus is terrestrial.

Reproduction: Tachymenis trigonatus is ovoviviparous.

Source: Wikipedia, article Pseudotomodon trigonatus. Content adapted from Wikipedia, available under the CC BY-SA 4.0 license. Accessed on 16/07/2026.





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Species photographs

Last published photographs

Foto
Photography ID: 418927
  Adult

Departamento El Cuy
Río Negro
Argentina
10/13/2019
Nicolas Chimento
Foto
Photography ID: 28563
♀
  Juvenile

General Roca
Río Negro
Argentina
10/30/2013
Pablo Chafrat
Foto
Photography ID: 12930
  Adult

General Roca
Río Negro
Argentina
09/26/2010
Julián Tocce



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
131030913/10/2019ArgentinaRío NegroValle Cretácico, Departamento El CuyNicolas Chimento
7763930/10/2013ArgentinaRío NegroBarda Norte, General RocaPablo Chafrat
3197626/09/2010ArgentinaRío NegroGeneral RocaJulián Tocce
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. False Tomodon Snake (Pseudotomodon trigonatus) – Species account. Accessed from www.ecoregistros.org on 26/09/2026.