Diadophis punctatus edwardsii

Diadophis punctatus edwardsii
Northern ringneck snake
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Dipsadinae
Genus: Diadophis
Species: D. punctatus
Subspecies: D. p. edwardsii
Trinomial name
Diadophis punctatus edwardsii
(Merrem, 1820)
Synonyms
  • Coluber edwardsii Merrem, 1820
  • Diadophis punctatus edwardsii — Dunn, 1920[1]

Diadophis punctatus edwardsii, commonly known as the Northern ringneck snake, is a subspecies of Diadophis punctatus. It is endemic to North America.

Etymology

The subspecific name, edwardsii, is in honor of English ornithologist George Edwards, who collected the type specimen.[2][3]

Description

The Northern ringneck snake has a body color from bluish grey to black, with a complete narrow yellow or orange ring around its neck and an underside matching the ring and generally lacking any dark spotting or patterning. The complete ring and lack of large dark spots on the belly differentiate it from other subspecies of D. punctatus.[4] In some regions, there are areas of intergradation with other subspecies. Generally from 10 to 15 inches (25–38 cm) long as an adult, they can reach more than two feet (61 cm) in length.[5]

Geographic range

In Canada it is found in the southern parts of Ontario, Quebec, and New Brunswick, and also in Nova Scotia. In the United States it is found throughout New England, the Mid-Atlantic states, and the Great Lakes region, and also at higher elevations in the South. More specifically, it is found in the following: NE Alabama, Connecticut, NW Georgia, SE Illinois, S Indiana, Kentucky, W Maryland, Massachusetts, Michigan, NE Minnesota, N New Jersey, New York, W North Carolina, Ohio, Pennsylvania, Rhode Island, extreme NW South Carolina, E Tennessee, W (western) Virginia, West Virginia, Wisconsin, and Florida.[5]

Behavior

The species is nocturnal and prone to hiding and traveling under rocks, fallen logs and leaf litter, so it is not commonly observed by people despite the potential abundant population density. (Another subspecies in Kansas was found to have densities of 700 to 1,800 per 1 hectare (0.0039 sq mi; 0.010 km2).) They are also social, and multiple ringnecks may be found in the same hiding spot during any season.[6]

Habitat

Their favored habitat over most of their range is a moist wooded area,[7] but they will also use the edges of wetlands or open areas in mountainous or hilly terrain. They are also often found in moist humid basements.

Reproduction

A female will lay her clutch of 2-10 eggs under a rock or in moist and rotting wood. Other female snakes may also use the same laying site, leading to single site egg finds of up to the mid fifties. The eggs hatch after about two months, and the young look essentially the same as the adults, possibly with a brighter color shade on the ring and belly. The eggs are 21–34 mm (¾-1¼ in.) long by 7–8 mm (¼ in.) wide, and the hatchlings are 100–125 mm (4-5 in.) in total length.[8] Egg laying is normally in early summer and hatching in late summer. In the winter, these snakes hibernate, in locations from stone walls or cellars to small mammal burrows to brush piles or rotting logs.

Diet

These snakes prey upon insects, salamanders, earthworms, slugs, small lizards, small snakes, and frogs.[8] The red backed salamander is a favorite food.

Predation

They are themselves known to be preyed upon by bullfrogs, toads, five species of predatory birds and six mammal species including shrews. Very young Northern ringneck snakes may also be eaten by large centipedes or large spiders.

References

  1. ↑ "Diadophis punctatus ". The Reptile Database. www.reptile-database.org.
  2. ↑ Beltz, Ellin. 2006. Scientific and Common Names of the Reptiles and Amphibians of North America - Explained. http://ebeltz.net/herps/biogappx.html#E
  3. ↑ 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. (Diadophis punctatus edwardsi, p. 81).
  4. ↑ Smith HM, Brodie ED Jr. 1982. Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN 0-307-13666-3. (Diadophis punctatus edwardsi, pp. 160-161).
  5. 1 2 Conant R. 1975. A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin. xviii + 429 pp. ISBN 0-395-19979-4 (hardcover), ISBN 0-395-19977-8 (paperback). (Diadophis punctatus edwardsi, p. 172 + Plate 25 + Map 133).
  6. ↑ Schmidt KP, Davis DD. 1941. Field Book of Snakes of the United States and Canada. New York: G.P. Putnam's Sons. 365 pp. (Diadophis punctatus edwardsii, pp. 111-112 + Plate 10, bottom).
  7. ↑ Conant R, Bridges W. 1939. What Snake is That?: A Field Guide to the Snakes of the United States East of the Rocky Mountains. (with 108 drawings by Edmond Malnate). New York and London: D. Appleton-Century. viii + 163 pp. + Plates A-C, 1-32. (Diadophis punctatus edwardsii, p. 36 + Plate 3, Figure 8).
  8. 1 2 Wright AH, Wright AA. 1957. Handbook of Snakes of the United States and Canada. Ithaca and London: Comstock. 1,105 pp. (in two volumes). (Diadophis punctatus edwardsi, pp. 185-190, Figure 59 + Map 20 on p. 179).

Further reading

External links

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