CaliforniaHerps.com

A Guide to the Amphibians
and Reptiles of California


San Bernardino Ring-necked Snake -
Diadophis punctatus modestus

Bocourt, 1886
Click on a picture for a larger view



Ring-necked Snake California Range Map
Range in California: Light Blue & adjacent Gray

Click the map for a guide
to the other subspecies



observation link





San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake
Adult, San Bernardino Mountains, San Bernardino County
San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake
Adult, San Gabriel Mountains foothills, Los Angeles County Adult, Los Angeles County
© Huck Triggs
San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake
An adult from Redlands, San Bernardino County, with a belly
that looks more orange than expected. © Mark Miller
Neonates, Los Angeles County
© Huck Triggs
San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake
Adults, Santa Catalina Island, Los Angeles County  © Nathan Smith
Monterey Ring-necked Snake Monterey Ring-necked Snake  
Adult, Ventura County, from the intergrade range with D. p. vandenburghii.
© Benjamin German
 
     
Ring-necked Snakes Feeding
San Bernardino Ring-necked Snake San Bernardino Ring-necked Snake Monterey Ring-necked Snake

An adult San Bernardino Ring-necked Snake eating an adult Arboreal Salamander in Los Angeles County © Jonathan Benson

Adult Monterey Ring-necked Snake eating a Slender Salamander, San Luis Obispo County © Andrew Harmer
San Diego Ring-necked Snake San Diego Ring-necked Snake San Diego Ring-necked Snake
Ring-necked Snakes use a mild venom to subdue their prey which include snakes and lizards. This San Diego Ring-necked Snake from San Diego County regurgitated a California Legless Lizard that it had recently eaten. © Donald Schultz
 
Habitat
San Bernardino Ring-necked Snake habitat San Bernardino Ring-necked Snake habitat san gab foothills habitat
Habitat, Riverside County Habitat, 6,100 ft, San Bernardino Mountains, San Bernardino County Habitat, 1400 ft., San Gabriel Mountains, Los Angeles County
  San Bernardino Ring-necked Snake habitat  
  Habitat, San Bernardino Mountains,
San Bernardino County
 
     
Short Videos of Ring-necked Snakes (of other subspecies)
ring-neck snake ring-necked snake
A Pacific Ring-necked Snake is found under a log in the woods and is filmed on an old picnic table before being released to crawl back under its log. A Pacific Ring-necked Snake is found under a board in a forest clearing and demonstrates how quickly it can move. A few brief views of a large San Diego Ring-necked snake and its habitat.
  San Diego Ring-necked Snake  
  A San Diego Ring-necked snake is released back where it was found.  
   
Description

Not Dangerous (Non-poisonous)  -  This snake does not have venom that is dangerous to most humans.

Mildly venomous. Not considered dangerous to humans.
Enlarged non-grooved teeth in the rear of the upper jaw and mild venom which may help to incapacitate small prey.

Size
The typical total length of an adult Ring-necked snake (Diadophis punctatus) varies somewhat by subspecies but in general it is about 11 - 16 inches (28 - 42 cm.)
Hatchlings are much smaller and longer specimens are sometimes found.
The record length is 33-5/8 inches (85.4 cm.)

Appearance
A small, thin snake with smooth scales.
Color and Pattern
Gray, blue-gray, blackish, or dark olive dorsal coloring, with a bright orange to reddish underside, speckled with black markings.
The underside of the tail is a bright reddish orange.
A narrow orange band around the neck, 1.5 - 2 scale rows wide.

Life History and Behavior

Activity
Secretive - usually found under the cover of rocks, wood, bark, boards and other surface debris, but occasionally seen moving on the surface on cloudy days, at dusk, or at night.
Defense
When disturbed, coils its tail like a corkscrew, exposing the underside which is usually bright red. It may also smear musk and cloacal contents.
Diet and Feeding
Eats slender salamanders and other small salamanders, tadpoles, small frogs, small snakes, lizards, worms, slugs, and insects. The mild venom may help to incapacitate prey.
Breeding
Lays eggs in the summer, sometimes in a communal nest.

Habitat
Prefers moist habitats, including wet meadows, rocky hillsides, gardens, farmland, grassland, chaparral, mixed coniferous forests, woodlands.

Geographical Range
The subspecies D. p. modestus is endemic to California. Found along the southern California coast from the Santa Barbara area south along the coast to San Diego County, and inland into the San Bernardino mountains, with a wide range of intergradation with D. p. pulchellus north into the Sierra Nevada Mountains of Kern County.

The species Diadophis punctatus - Ring-necked Snake, has a very wide range, occurring along the entire east coast of the United States west to the Great Lakes and southwest from there through the Midwest into Arizona, with scattered isolated populations throughout most of the western states including the western half of California, Oregon west of the Cascades, and south central Washington.

In 2010 a ring-necked snake was found on the eastern slope of the Sierra Nevada (where it had not been found before) .5 miles east of the Inyo/Tulare county line, making it only the second of this species recorded in Inyo County.
(Herpetological Review 41(3), 2010)

In 2014, D. punctatus was documented from the Piute Mountains in Kern County. (Herpetological Review 45(3), 2014)

Full Species Range Map
Notes on Taxonomy
Many herpetologists no longer recognize the traditional morphologically-based subspecies of Diadophis punctatus, pending a thorough molecular study of the whole species. One ongoing study (Feldman and Spicer, 2006, Mol. Ecol. 15:2201-2222) has found all of the D. punctatus subspecies in California (except D. p. regalis) to be indistinguishable. It is likely that D. punctatus is composed of several distinct lineages that do not follow the geographic ranges of the subspecies.


In a phylogeographic analysis of the species, Fontanella, et. al. (2008) identified fourteen lineages of Diadophis punctatus. They did not recognize these lineages as separate species, pending a full taxonomic review that will require further dna sampling and evaluation including Diadophis populations in Mexico.

They recognized four distinct lineages in California, which loosely follow existing subspecies boundaries, but merge the seven subspecies into 4 groups:

* A southern California lineage, which includes the San Diego and San Bernardino subspecies, D. p. similis, and D. p. modestus

* An eastern California lineage, which includes the Coral-bellied subspecies, D. p. pulchellus, and some of the northern intergrades with D. p. occidentalis.

* A Coastal California lineage, which includes the Monterey subspecies, D. p. vandenburghi, the Pacific subspcies, D. p. amabilis, the Northwestern subspecies, D. p. occidentalis, and snakes from one region of the western Sierra Nevada currently recognized as D. p. pulchellus, along with the southern intergrades in the Tehachapi mountains region.

* A Great Basin lineage which presumably includes the Regal subspecies, D. p. regalis, found in isolated locations in the eastern Mojave.

A rough interpretation of the ranges of these four lineages is illustrated in the map below.
New Ring-necked Lineages Range Map
Red: Southern lineage
Orange: Eastern lineage
Purple: Coastal lineage      
           Light Blue: Great Basin lineage

Alternate and Previous Names (Synonyms)

Diadophis punctatus modestus - (Stebbins 1966, 1985, 2003, 2012)
Diadophis punctatus modestus
(Wright & Wright 1957)
Diadophis amabilis modestus
- (Stebbins 1954)
Los Angeles ring-neck snake / San Bernardino ring-necked snake (Ditmars 1936)
Van Denburgh's ring-neck snake; western ring-neck snake (Ditmars 1907)

Conservation Issues  (Conservation Status)
On the US Forest Service watch list.
Taxonomy
Family Colubridae Colubrids Oppel, 1811
Genus Diadophis Ring-necked Snakes Baird and Girard, 1853
Species punctatus Ring-necked Snake (Linnaeus, 1766)
Subspecies

modestus San Bernardino Ring-necked Snake Bocourt, 1886
Original Description
Diadophis punctatus - (Linnaeus, 1766) - Syst. Nat., 12th ed., Vol. 1, p. 376
Diadophis punctatus modestus - Bocourt, 1886 - in Dumeril, Bocourt and Mocquard, Miss. Sci. Mex. et dans L'Amerique Centrale, Vol. 3, Pt. 10, p. 623

from Original Description Citations for the Reptiles and Amphibians of North America © Ellin Beltz

Meaning of the Scientific Name
Diadophis - Latin - diadema - crown and Greek -ophis - snake -- "generally w/a light ring on the occipital region."
punctatus
- Latin - dotted - refers to spotted belly of species
modestus - Latin - calm, modest, unpretentious

from Scientific and Common Names of the Reptiles and Amphibians of North America - Explained © Ellin Beltz

Related or Similar California Snakes
D. p. amabilis - Pacific Ring-necked Snake
D. p. occidentalis - Northwestern Ring-necked Snake
D. p. pulchellus - Coral-bellied Ring-necked Snake
D. p. regalis - Regal Ring-necked Snake
D. p. similis - San Diego Ring-necked Snake
D. p. vandenburghi - Monterey Ring-necked Snake
C. tenuis - Sharp-tailed Snake
T. hobartsmithi - Smith's Black-headed Snake
T. planiceps - Western Black-headed Snake

More Information and References
California Department of Fish and Wildlife

Stebbins, Robert C., and McGinnis, Samuel M.  Field Guide to Amphibians and Reptiles of California: Revised Edition (California Natural History Guides) University of California Press, 2012.

Stebbins, Robert C. California Amphibians and Reptiles. The University of California Press, 1972.

Stebbins, Robert C. A Field Guide to Western Reptiles and Amphibians. 3rd Edition. Houghton Mifflin Company, 2003.

Behler, John L., and F. Wayne King. The Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf, 1992.

Powell, Robert., Joseph T. Collins, and Errol D. Hooper Jr. A Key to Amphibians and Reptiles of the Continental United States and Canada. The University Press of Kansas, 1998.

Bartlett, R. D. & Patricia P. Bartlett. Guide and Reference to the Snakes of Western North America (North of Mexico) and Hawaii. University Press of Florida, 2009.

Bartlett, R. D. & Alan Tennant. Snakes of North America - Western Region. Gulf Publishing Co., 2000.

Brown, Philip R. A Field Guide to Snakes of California. Gulf Publishing Co., 1997.

Ernst, Carl H., Evelyn M. Ernst, & Robert M. Corker. Snakes of the United States and Canada. Smithsonian Institution Press, 2003.

Wright, Albert Hazen & Anna Allen Wright. Handbook of Snakes of the United States and Canada. Cornell University Press, 1957.

Fontanella , Frank M., Chris R. Feldman, Mark E. Siddall, & Frank T. Burbrink. Phylogeography of Diadophis punctatus: Extensive lineage diversity and repeated patterns of historical demography in a trans-continental snake. Molecular Phylogenetics and Evolution 46 (2008) 1049–1070. 2008.
Conservation Status

The following status listings come from the Special Animals List and the Endangered and Threatened Animals List which are published by the California Department of Fish and Wildlife.



Organization
Status Listing
NatureServe Global Ranking G5T2T3Q The species is: Secure—Common; widespread and abundant.
This subspecies is Imperiled - Vulnerable.
There are taxonomic questions associated with it.
NatureServe State Ranking S2

Imperiled in the state because of rarity due to very restricted range, very few populations (often 20 or fewer), steep declines, or other factors making it very vulnerable to extirpation from the state.

U.S. Endangered Species Act (ESA) None
California Endangered Species Act (CESA) None
California Department of Fish and Wildlife None
Bureau of Land Management None
USDA Forest Service S Sensitive
IUCN Not listed

 

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