Range in California: Orange
Click the map for a guide
to the other subspecies
iPhone App
Electronic Field Guide to the
Reptiles and Amphibians of
Southern California
Available Now at the
iTunes App Store. |
|
|
|
|
Adult, Humboldt County |
Adult, Humboldt County |
Adult, Humboldt County |
|
|
|
Adult, Napa County |
|
 |
 |
 |
|
Adult, from eastern Lake County, a probable intergrade with D. p. amabilis.
© Nancy Mittasch |
Habitat |
|
|
|
Habitat, Napa County
|
Habitat, Humboldt County |
|
| Short Videos - Including Other Subspecies of D. punctatus |
 |
 |
 |
| 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. |
|
Description |
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. This subspecies typically gets to 18 inches (46 cm). The record length is 33-5/8 inches (85.4 cm.) |
| Appearance |
| A small, thin snake with smooth scales. Gray, blue-gray, blackish, or dark olive dorsal coloring, with a bright orange to reddish underside, lightly speckled with black markings, heavily speckled under the chin. The underside of the tail is a bright reddish orange. A narrow orange band around the neck, 1.5 - 3 scale rows wide. |
| Behavior |
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.
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 |
| 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. |
| Reproduction |
| Lays eggs in the summer, sometimes in a communal nest. |
| Range |
This subspecies, Diadophis punctatus occidentalis - Northwestern Ring-necked Snake, is found along the northern California coast from Sonoma County to the Oregon border, and inland through the coast ranges, and north through Oregon into southern Washington, with isoloated populations in Idaho.
The species Diadophis punctatus - Ring-necked Snake, has a very wide range, occuring 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. |
| Habitat |
| Prefers moist habitats, including wet meadows, rocky hillsides, gardens, farmland, grassland, chaparral, coniferous forests, mixed woodlands. |
| Taxonomic Notes |
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. |
Green: Southern lineage
Orange: Eastern lineage
Blue: Coastal lineage
Light Blue: Great Basin lineage
|
| Conservation Issues (Conservation Status) |
| None. |
|
|
Taxonomy |
| Family |
Colubridae |
Colubrids |
| Genus |
Diadophis |
Ring-necked Snakes |
| Species |
punctatus |
Ring-necked Snake |
Subspecies
|
occidentalis |
Northwestern Ring-necked Snake |
|
Original Description |
Diadophis punctatus - (Linnaeus, 1766) - Syst. Nat., 12th ed., Vol. 1, p. 376
Diadophis punctatus occidentalis - Blanchard, 1923 - Occ. Papers Mus. Zool. Univ. Michigan, No. 142, p. 6
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
occidentalis - Latin - western - probably refers to distribution
from Scientific and Common Names of the Reptiles and Amphibians of North America - Explained © Ellin Beltz
|
|
Alternate Names |
Diadophis punctatus - Ring-necked Snake (no subspecies recognized)
|
|
Related or Similar California Snakes |
D. p. amabilis - Pacific Ring-necked Snake
D. p. modestus - San Bernardino 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
|
|
More Information and References |
Natureserve Explorer
California Dept. of Fish and Game
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.
Brown et. al. Reptiles of Washington and Oregon. Seattle Audubon Society,1995.
Nussbaum, R. A., E. D. Brodie Jr., and R. M. Storm. Amphibians and Reptiles of the Pacific Northwest. Moscow,
Idaho: University Press of Idaho, 1983.
St. John, Alan D. Reptiles of the Northwest: Alaska to California; Rockies to the Coast. Lone Pine Publishing, 2002.
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.
|
|
|
|
The following status listings come from the Special Animals List which is published by the California Department of Fish and Wildlife.
This snake is not included on the Special Animals List, which indicates that there are no significant conservation concerns for it in California.
|
Organization
|
Status Listing
|
| 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 |
None |
|
| Natureserve Global Conservation Status Ranks |
|
|
World Conservation Union - IUCN Red List
|
|
|
|
|
