Northern Mexican gartersnake (Thamnophis eques megalops)

Federal Register | Recovery | Critical Habitat | Conservation Plans | Petitions | Life History

Listing Status:   

Where Listed: WHEREVER FOUND

General Information

The northern Mexican gartersnake may occur with other native gartersnake species and can be difficult for people without herpetological expertise to identify. With a maximum known length of 44 inches (in) (112 centimeters (cm)), it ranges in background color from olive to olive-brown to olive-gray with three stripes that run the length of the body. The middle dorsal stripe is yellow and darkens toward the tail. The pale yellow to light-tan lateral stripes distinguish the Mexican gartersnake from other sympatric (co-occurring) gartersnake species because a portion of the lateral stripe is found on the fourth scale row, while it is confined to lower scale rows for other species. Throughout its rangewide distribution, the northern Mexican gartersnake occurs at elevations from 130 to 8,497 feet (ft) (40 to 2,590 meters (m)) (Rossman et al. 1996, p. 172). The northern Mexican gartersnake is considered a riparian obligate (restricted to riparian areas when not engaged in dispersal behavior) and occurs chiefly in the following general habitat types: (1) Source-area wetlands [e.g., cienegas (mid-elevation wetlands with highly organic, reducing (basic, or alkaline) soils), stock tanks (small earthen impoundment), etc.]; (2) large river riparian woodlands and forests; and (3) streamside gallery forests (as defined by well-developed broadleaf deciduous riparian forests with limited, if any, herbaceous ground cover or dense grass).

  • States/US Territories in which the Northern Mexican gartersnake is known to or is believed to occur:  Arizona , New Mexico
  • US Counties in which the Northern Mexican gartersnake is known to or is believed to occur:  View All
  • USFWS Refuges in which the Northern Mexican gartersnake is known to occur:  Bill Williams River National Wildlife Refuge, San Bernardino National Wildlife Refuge
  • Countries in which the the Northern Mexican gartersnake is known to occur:  Mexico
 
Current Listing Status Summary
Status Date Listed Lead Region Where Listed
07/08/2014 Southwest Region (Region 2)

» Federal Register Documents

Federal Register Documents
Date Citation Page Title
12/10/2008 73 FR 75176 75244 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
11/15/1994 59 FR 58982 59028 ETWP; Animal Candidate Review for Listing as Endangered or Threatened Species.
07/10/2013 78 FR 41549 41608 Designation of Critical Habitat for the Northern Mexican Gartersnake and Narrow-Headed Gartersnake: Proposed Rule
09/26/2006 71 FR 56228 56256 12-Month Finding on a Petition To List the Northern Mexican Gartersnake (Thamnophis eques megalops) as Threatened or Endangered With Critical Habitat
11/21/2012 77 FR 69993 70060 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
09/18/1985 50 FR 37958 37967 Review of Vertebrate Wildlife; Notice of Review; 50 FR 37958-37967
07/08/2014 79 FR 38677 38746 Threatened Status for the Northern Mexican Gartersnake and Narrow-Headed Gartersnake; Final Rule
10/26/2011 76 FR 66370 66439 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
05/28/2008 73 FR 30596 30598 Initiation of Status Review for the Northern Mexican Gartersnake (Thamnophis eques megalops)
11/21/1991 56 FR 58804 58836 ETWP; Animal Candidate Review for Listing as Endangered or Threatened Species; 56 FR 58804 58836
11/25/2008 73 FR 71788 71826 12-Month Finding on a Petition To List the Northern Mexican Gartersnake (Thamnophis eques megalops) as Threatened or Endangered With Critical Habitat; Proposed Rule
11/09/2009 74 FR 57804 57878 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions
07/10/2013 78 FR 41499 41547 Threatened Status for the Northern Mexican Gartersnake and Narrow-headed Gartersnake: Proposed Rule.
11/10/2010 75 FR 69222 69294 Review of Native Species That Are Candidates for Listing as Endangered or Threatened; Annual Notice of Findings on Resubmitted Petitions; Annual Description of Progress on Listing Actions; Proposed Rule
01/04/2006 71 FR 315 324 90-Day Finding on a Petition To List the Northern Mexican Gartersnake as threatened or Endangered With Critical Habitat (Substantial) and initiation of status review.
01/06/1989 54 FR 554 579 ETWP; Animal Notice of Review; 54 FR 554 579
Special Rule Publications
Date Citation Page Title
07/08/2014 79 FR 38677 38746 Threatened Status for the Northern Mexican Gartersnake and Narrow-Headed Gartersnake; Final Rule

» Recovery

No recovery information is available for the Northern Mexican gartersnake.

» Critical Habitat

Date Citation Page Title Document Type Status
07/10/2013 78 FR 41549 41608 Designation of Critical Habitat for the Northern Mexican Gartersnake and Narrow-Headed Gartersnake: Proposed Rule Proposed Rule Proposed

To learn more about critical habitat please see http://ecos.fws.gov/crithab

» Conservation Plans

No conservation plans have been created for Northern Mexican gartersnake.

» Petitions

» Life History

No Life History information has been entered into this system for this species.

» Other Resources

NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.