Southern hognose snake

Southern hognose snake
Adult southern hog-nosed snake
Red phase southern hog-nosed snake
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Xenodontinae
Genus: Heterodon
Species: H. simus
Binomial name
Heterodon simus
(Linnaeus, 1766)
Synonyms
  • Coluber simus Linnaeus, 1766
  • Heterodon simus — Holbrook, 1842[1]

Heterodon simus, commonly known as the southern hog-nosed snake, is a harmless snake species endemic to the southeastern United States. No subspecies are currently recognized.[2]

Description

Adults are 35.5–61 cm (14-24 inches) in total length. Stout with a wide neck and a sharply upturned snout, they usually have 25 rows of keeled dorsal scales at midbody.[3]

The dorsal color pattern consists of a light brown, yellowish, grayish, or reddish ground color, overlaid with a distinct row of dark blotches that alternate with smaller blotches on the flanks. The belly is distinctly darker in color than the underside of the tail in juveniles. As the snake ages, the underside usually becomes a pale white.[3]

Habitat

Heterodon simus occurs in dry and open sandy areas, dry river floodplains, fields, and wire grass flatwoods.[3]

Geographic range

It is found on the coastal plain of the southeastern United States from North Carolina, south to Lake Okeechobee in Florida, and west to Mississippi.[3]

Diet

Heterodon simus preys upon toads, frogs (especially Hyla gratiosa and Pseudacris ornata), spadefoots, and lizards.[4]

Reproduction

This species is oviparous. Sexually mature adults mate from April through August. The thin-shelled, leathery, whitish eggs are laid in clutches of 6-14. After 55–60 days the eggs hatch. Each hatchling is 15–18 cm (6-7 inches) in total length.[5]

Conservation status

This species is classified as Vulnerable (VU) on the IUCN Red List of Threatened Species with the following criteria: C1+2a(i) (v3.1, 2001).[6] A species is listed as such when the best available evidence indicates that the population size is estimated to number fewer than 10,000 mature individuals, a decline of at least 10% is estimated to continue within 10 years or three generations, whichever is longer, (up to a maximum of 100 years in the future), and a continuing decline has been observed, projected, or inferred, in numbers of mature individuals and no subpopulation is estimated to contain more than 1,000 mature individuals. It is therefore considered to be facing a high risk of extinction in the wild. The population trend is down. Year assessed: 2007.[7] The Alabama Department of Conservation and Natural Resources has listed the species as possibly extirpated within the state.[8]

References

  1. ↑ Stejneger, L.H., and T. Barbour. 1917. A Check List of North American Amphibians and Reptiles. Harvard University Press. Cambridge, Massachusetts. 125 pp. (Heterodon simus, p. 77.)
  2. ↑ "Heterodon simus". Integrated Taxonomic Information System. Retrieved 14 September 2007.
  3. 1 2 3 4 Behler, J.L., and F.W. King. 1979. The Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf. New York. 743 pp. LCCCN 79-2217. ISBN 0-394-50824-6.
  4. ↑ Wright, A.H., and A.A. Wright. 1957. Handbook of Snakes of the United States and Canada. Comstock. Ithaca and London. 1,105 pp. (in 2 volumes) (Heterodon simus, pp. 312-314, Figure 96. + Map 28. on p. 298.)
  5. ↑ "Heterodon simus at Florida Museum of Natural History". Retrieved 16 May 2013.
  6. ↑ Heterodon simus at the IUCN Red List. Accessed 14 September 2007.
  7. ↑ 2001 Categories & Criteria (version 3.1) at the IUCN Red List. Accessed 14 September 2007.
  8. ↑ "Snakes in Alabama". Outdoor Alabama. Alabama Department of Conservation and Natural Resources. Retrieved June 6, 2012.

Further reading

Wikimedia Commons has media related to Heterodon simus.
Describes the natural history of H. Simus
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