Kingdom: Animalia
Phylum: Craniata
Class: Reptilia
Order: Squamata
Family: Viperidae
Genus: Crotalus
Species: willardi obscurus
New Mexico Ridgenose Rattlesnake - Crotalus willardi obscurus
305315
Species Extent (New Mexico)
General Description
New Mexico Ridge-nosed Rattlesnake (Crotalus willardi obscurus) is a small (0.62 m total length) rattlesnake that is only found in the mountains of far southwestern New Mexico, neighboring Arizona, and northern Mexico. They live primarily at high elevations in pine-oak woodlands, pine-fir forests, and pinyon-juniper woodlands. Their gestation period is 13 months, at which point they give birth to live young.
Status
Global Rank: G5
State Rank: S1
| Rank Metadata |
| State Rank:
S1
|
Rank Changed:
02/17/1991
|
| Rank Reviewed:
04/05/2017
|
| Reason:
N/A
|
| Ecological Factors |
| Specificity:
N/A
|
Range Extent:
N/A
|
| Occurences:
N/A
|
Population Size:
N/A
|
| Area of Occupancy:
N/A
|
Threat Summary:
N/A
|
State Status: E
Federal Status: Listed Threatened [LT]
USFS Status:
BLM Status:
SWAP Status: SGCN
NMRP Strategy Status:
Observations in Natural Heritage New Mexico Database
Number of Subpopulations: 10
Number of Mapped Locations: 833
Number of Observations: 889
Observation date range: 01-01-1901
to 10-05-2019
External Links
Year
1961
Citation Bogert, C.M. and W.G. Degenhardt. 1961. An addition to the fauna of the United States, the Chihuahua ridge-nosed rattlesnake in New Mexico. American Museum of Nat. Hist. Novitates 2064:1-15.
Reference Code
A61BOG01NMUS
Year
1976
Citation Harris, H.S. and R.S. Simmons. 1976. The paleogeography and evolution of Crotalus willardi, with a formal description of a new subspecies from New Mexico, United States. Bul. of Maryland Herp. Soc., 12(1):1-22.
Reference Code
A76HAR01NMUS
Year
1969
Citation Kauffeld, C. 1969. Snakes: The keeper and the kept. Doubleday and Co., Inc. Garden City, N.Y. 248 pp.
Reference Code
B69KAU01NMUS
Year
2021
Citation Hathcock, C., and Holycross, A. 2021. Preparation and databasing of Animas and Peloncillo mountains snake locations. Received from Chuck Hathcock at NMDGF by email (jackieo@unm.edu) 10 December 2021.
Reference Code
D21HAT01NMUS
Year
2017
Citation Christman, B. 2017. FWS Annual Permit Report and Data for Chiricahua Leopard Frog, Narrow-headed and Mexican Gartersnakes, and New Mexico Ridge-nosed Rattlesnake. FWS Permit TE-071287-1. Albuquerque, NM.
Reference Code
E17CHR01NMUS
Year
2011
Citation Christman, M.R. 2011. Photograph and sighting of Crotalus willardi obscurus.
Reference Code
I11CHR01NMUS
Year
1990
Citation Painter, C. 1990. Locality of Crotalus willardi obscurus in Peloncillo Mountains. Hand drawn from U.S.G.S. Guadalupe Canyon Ariz-NM and Apache AZ-NM quadrangle, 15 min series - 19 and attached xeroxed 15 min. topo map.
Reference Code
M90PAI02NMUS
Year
1990
Citation Lowe, C. Dept. of Ecology and evolutionary Biology, University of Arizona, Tucson, AZ. (602) 621-3187.
Reference Code
P90LOW01NMUS
Year
1998
Citation Painter, C. 1998. Status of New Mexico Ridgenose Rattlesnake. Performance report to U.S. Fish and Wildlife Service, Section 6 E-23-6. New Mexico Department of Game and Fish, 20 p.
Reference Code
R98PAI02NMUS
Year
60
Citation S60DEGSBNMUS, Legacy reference. Physical copy not yet located.
Reference Code
S60DEGSBNMUS
Year
61
Citation S61KAUSBNMUS, Legacy reference. Physical copy not yet located.
Reference Code
S61KAUSBNMUS
Year
Citation SXXXXXSBNMUS, Legacy reference. Physical copy not yet located.
Reference Code
SXXXXXSBNMUS
Year
2006
Citation Painter, C. 2006. Field forms for Chiricahua Leopard Frogs (Rana chiricahuensis) in Southwesten New Mexico. 1000+ p.(2000-2004).
Reference Code
U06PAI01NMUS
Year
2007
Citation Propst, D. 2007. New Mexico Department of Game and Fish collections under USFWS permit TE815409-0 for 2006. 4 p.
Reference Code
U07PRO01NMUS
Year
1977
Citation Hubbard, J.P. et.al. 1977. A biological inventory of the Animas Mountains. Hidalgo County, New Mexico. Unpubl. manuscript for endangered species program, N.M. Dept. of Game and Fish. 53 pp.
Reference Code
U77HUB01NMUS
Year
1980
Citation Applegarth, J.S. 1980. The ridge-nosed rattlesnake in New Mexico: a review of existing information and a search for suitable habitat on public lands. Unpubl. manuscript for US Bureau of Land Mngt., Las Cruces, 140 pp.
Reference Code
U80APP01NMUS
Year
80
Citation U80APPO1NMUS, Legacy reference. Physical copy not yet located.
Reference Code
U80APPO1NMUS
Year
1990
Citation Painter, C.W. 1990. Field trip into the Animas Mountains, Gray Ranch, Hidalgo County, New Mexico. Unpub. manuscript to the Nature Conservancy NMNHP. 4 pp.
Reference Code
U90PAI01NMUS
Year
1990
Citation Sugg, D.W. 1990. Unpublished listing of amphibians specimens from MSB. 5 pp.
Reference Code
U90SUG01NMUS
Year
1991
Citation Painter, C.W. et al. 1991. The continuation of studies of the natural history of the New Mexico ridgenose rattlesnake Crotalus willardi obscurus, Gray Ranch NM, Unpubl. report for N.M. Dept Game and Fish submitted 15 Oct 91. 6 pp.
Reference Code
U91PAI03NMUS
Year
1993
Citation Montoya, B. 1993.Tables and maps for aquatic species collected during the calendar year1993. New Mexico Department of Game and Fish. Santa Fe, New Mexico. 7 p.
Reference Code
U93MON01NMUS
Year
1994
Citation Painter, C. 1994. Notes from phone call to Pat Mehlhop on desert tortoise and Crotalus willardi.
Reference Code
U94PAI04NMUS
Year
1995
Citation Holycross, A.T. 1995. Biogeography of Crotalus willardi in the Madrean Archipelago of Arizona. Unpubl. Quarterly Progress Report. Heritage IIPAM Grants-in-Aid Award I95048, p. 5.
Reference Code
U95HOL01NMUS
Year
1995
Citation Holycross, A.T. 1995. Status of the Animas Mountains Population of Crotalus willardi obscurus. Unpublished Report of Activities Conducted Under professional Service Contract No. 95-516-28 for the New Mexico Game and Fish Department (NMDGF). Arizona State
Reference Code
U95HOL03NMUS
