Smithsonian National Museum of Natural History, North American Mammals
Search the Archive

  Rodentia · Geomyidae · Geomys knoxjonesi
  Smithsonian Institution
  Copyright Notice
  Privacy Notice
 
Geomys knoxjonesi

Knox Jones's Pocket Gopher

Order: Rodentia
Family: Geomyidae

Image of Geomys knoxjonesi
Geomys knoxjonesi - right (G. bursarius on left)
Click to enlarge. (63 kb)

Conservation Status: Least Concern.


Many rodents that are adapted to arid conditions--pocket mice, harvest mice, grasshopper mice, deer mice, kangaroo rats, and ground squirrels--occur in the same regions as Jones's Pocket Gopher in western Texas and eastern New Mexico, but only the pocket gophers (family Geomyidae) have a fossorial (that is, underground) lifestyle. Jones's Pocket Gophers are very difficult to distinguish from four other pocket gopher species without genetic and geographic data. At least this is true for scientists: presumably the pocket gopher can easily recognize another of its own species. They breed in the fall, and they produce one litter, of 2-4 offspring, a year. The gestation period is probably only about 23 days, which suggests that the female may store sperm in her body for several months before the eggs are fertilized and embryos begin to develop, or that fertilization may occur but development is delayed. As with many other mammals, much remains to be learned about this species of pocket gopher.

Sexual Dimorphism:
Males are larger than females.

Length:
Average: 236 mm
Range: 203-282 mm

Weight:
Range: 160-185 g

References:

Baker R. J., H. H. Genoways. 1975. A new subspecies of Geomys bursarius (Mammalia: Geomyidae) from Texas and New Mexico. Occasional Papers, The Museum, Texas Tech University, 29:1–18.

Links:

Mammal Species of the World

Distribution of Geomys knoxjonesi