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Drymarchon

Drymarchon
Drymarchon couperi, eastern indigo snake
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Colubrinae
Genus: Drymarchon
Fitzinger, 1843[1]
Species

See text

Synonyms[2]
  • Georgia Baird and Girard, 1853
  • Geoptyas Steindachner, 1867
  • Morenoa Duges, 1905

Drymarchon is a genus of large nonvenomous colubrid snakes, commonly known as indigo snakes or cribos,[3] found in the Southeastern United States, Mexico, Central America, and South America.

Description

Indigo snakes are large, robust snakes. They have smooth dorsal scales, and several color variations, including a glossy blue-black color. This snake genus, Drymarchon, means "Lord of The Forest". The species in this genus are sexually dimorphic, with the males being larger than the females. This is thought to be due to intraspecies competition from the males.[4]

Behavior and diet

Indigo snakes are diurnal and actively forage for prey. They feed on a broad variety of small animals such as rodents, birds, lizards, frogs, toads, and other snakes, including rattlesnakes. Indigo snakes will also eat small gopher tortoises when they are available.[5] They are not aggressive snakes and will bite only when threatened. Typical threat display includes hissing and shaking of its tail as a warning.

Habitat

The current distribution of D. couperi is reported as extending from the Coastal Plain of southern Georgia to peninsular Florida and the lower Florida Keys west to Southeastern Mississippi. They use a variety of different habitats, including longleaf pine-turkey oak sandhills, pine and scrub flatwoods, dry prairie, tropical hardwoods, freshwater wetlands, and coastal dunes; however, winter survival, especially in northern portions of its range, depends on the availability of appropriate shelters which are primarily Gopher Tortoise burrows.[6] These burrows can be used to hide from predators, fires, and extreme temperatures.[7]

Threats

Populations in Alabama, Texas, and South Carolina have been largely lost due to habitat destruction, poaching, and killings. Indigo snakes are currently protected under the United States Fish and Wildlife Service and the Florida Fish and Wildlife Conservation Commission which makes it illegal to possess, harm, or harass them. Permits are also required in order to keep or transport this species.[8]

Species and subspecies

Drymarchon melanurus erebennus

The genus Drymarchon was formerly considered to be a monotypic taxon formed by subspecies of D. corais. Currently the genus includes six distinct species recognized by ITIS:[9] One of the species has several subspecies which are recognized as being valid.

Nota bene: A binomial authority or a trinomial authority in parentheses indicates that the species or subspecies was originally described in a genus other than Drymarchon.

References

  1. ^ Fitzinger L (1843). Systema Reptilium, Fasciculus Primus, Amblyglossae. Vienna: Braumüller & Seidel. 106 pp. + indices. (Drymarchon, new genus, p. 26). (in Latin).
  2. ^ McCranie, James R. 1980. Drymarchon, D. corais. Catalogue of American Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles, 267: 1-4.
  3. ^ "Cribos and Indigo Snakes" (PDF). madisonherps.org. Archived from the original (PDF) on 2018-10-22. Retrieved 2018-10-21.
  4. ^ Stevenson, Dirk J.; Dyer, Karen J.; Willis-Stevenson, Beth A. (2003). "Survey and Monitoring of the Eastern Indigo Snake in Georgia". Southeastern Naturalist. 2 (3): 393–408. doi:10.1656/1528-7092(2003)002[0393:SAMOTE]2.0.CO;2. ISSN 1528-7092. JSTOR 3878009. S2CID 86306664.
  5. ^ Stevenson, Dirk J.; Bolt, M. Rebecca; Smith, Daniel J.; Enge, Kevin M.; Hyslop, Natalie L.; Norton, Terry M.; Dyer, Karen J. (March 2010). "Prey Records for the Eastern Indigo Snake ( Drymarchon couperi )". Southeastern Naturalist. 9 (1): 1–18. doi:10.1656/058.009.0101. ISSN 1528-7092.
  6. ^ Hyslop, N.L (2007). "Movements, habitat use, and survival of the threatened eastern indigo snake (Drymarchon couperi) in Georgia". Diss. University of Georgia: 12.
  7. ^ HYSLOP, NATALIE L.; MEYERS, J. MICHAEL; COOPER, ROBERT J.; STEVENSON, DIRK J. (2014). "Effects of Body Size and Sex of "Drymarchon couperi" (Eastern Indigo Snake) on Habitat Use, Movements, and Home Range Size in Georgia". The Journal of Wildlife Management. 78 (1): 101–111. Bibcode:2014JWMan..78..101H. doi:10.1002/jwmg.645. ISSN 0022-541X. JSTOR 43188431.
  8. ^ Stevenson, Dirk J.; Dyer, Karen J.; Willis-Stevenson, Beth A. (2003). "Survey and Monitoring of the Eastern Indigo Snake in Georgia". Southeastern Naturalist. 2 (3): 393–408. doi:10.1656/1528-7092(2003)002[0393:SAMOTE]2.0.CO;2. ISSN 1528-7092. JSTOR 3878009. S2CID 86306664.
  9. ^ "Drymarchon ". Integrated Taxonomic Information System. Retrieved 2011-02-06.
  10. ^ Wüster, Wolfgang; Yrausquin, José Luís; Mijares-Urrutia, Abraham [in French] (2001). "A new species of indigo snake from north-western Venezuela (Serpentes: Colubridae: Drymarchon)" (PDF). Herpetological Journal. 11: 157–165. Archived from the original (PDF) on 2007-02-05. (Drymarchon caudomaculatus, new species).
  11. ^ Hammerson GA (2007). "Drymarchon couperi ". IUCN Red List of Threatened Species. 2007: e.T63773A12714602. doi:10.2305/IUCN.UK.2007.RLTS.T63773A12714602.en.
  12. ^ Krysko, Kenneth L.; Granatosky, Michael C.; Nuñez, Leroy P.; Smith, Daniel J. (2016-07-18). "A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States". Zootaxa. 4138 (3): 549–569. doi:10.11646/zootaxa.4138.3.9. ISSN 1175-5334. PMID 27470779.
  13. ^ Gutiérrez-Cárdenas, P.; Rivas, G. (2017). "Drymarchon melanurus". IUCN Red List of Threatened Species. 2017: e.T63774A3129309. doi:10.2305/IUCN.UK.2017-2.RLTS.T63774A3129309.en. Retrieved 12 November 2021.
Quelle: http://en.wikipedia.org/wiki/Indigo_snake