IUCN threat status:

Least Concern (LC)


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Porthidium dunni

Common names: Dunn's hognosed pitviper.[2]

Porthidium dunni is a venomous pitviper species found in Mexico. No subspecies are currently recognized.[3]


The specific name, dunni, is in honor of American herpetologist Emmett Reid Dunn[4] "in appreciation of his work on American snake fauna".[5]


Adults are usually 30-40 cm (11¾-15¾ inches) in total length (including tail), with a maximum of 57 cm (22⅜ inches). A moderately stout and terrestrial species, the tip of the snout is moderately elevated.[2]

Geographic range[edit]

P. dunni is found in southern Mexico in the Pacific lowlands of Oaxaca and western Chiapas.

The type locality given is "the immediate vicinity of the village of Tehuantepec" [Oaxaca, Mexico].[1]

Conservation status[edit]

This species is classified as Least Concern (LC) on the IUCN Red List of Threatened Species (v3.1, 2001).[6] Species are listed as such due to their wide distribution, presumed large population, or because it is unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend is stable. Year assessed: 2007.[7]

See also[edit]


  1. ^ a b McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
  2. ^ a b Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Ithaca and London: Comstock Publishing Associates. 870 pp. 1,500 plates. ISBN 0-8014-4141-2.
  3. ^ "Porthidium dunni". Integrated Taxonomic Information System. Retrieved 15 September 2007. 
  4. ^ Beolens B, Watkins M, Grayson M. 2011. The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Porthidium dunni, p. 77).
  5. ^ Hartweg & Oliver. 1938. pp. 5-6.
  6. ^ Porthidium dunni at the IUCN Red List. Accessed 15 September 2007.
  7. ^ 2001 Categories & Criteria (version 3.1) at the IUCN Red List. Accessed 15 September 2007.

Further reading[edit]

  • Hartweg, Norman, and James A. Oliver. 1938. A Contribution to the Herpetology of the Isthmus of Tehuantepec: III. Three New Snakes from the Pacific Slope. Occasional Papers of the Museum of Zoology, University of Michigan (390): 1-8 + Plate I. (Trimeresurus dunni, new species, pages 6-7 + Plate I, Figures B & D).


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