|Senior synonym of Formica aggerans: Forel, 1914c PDF: 619; Creighton, 1940a PDF: 1; of Formica melanotica: Creighton, 1950a PDF: 492.|
Regularity: Regularly occurring
Type of Residency: Year-round
The current concept of F. obscuripes allows for variation in length and density of setae and pubescence on all abovementioned surfaces. In the Great Plains and Pacific Northwest, majors are somewhat infuscated, while minors are completely dark.
Molecular Biology and Genetics
Statistics of barcoding coverage: Formica obscuripes
Public Records: 0
Specimens with Barcodes: 25
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
Formica obscuripes (the western thatching ant) is a species of ant in the family Formicidae. It is native to North America. It produces large mounds covered by small pieces of plant material. The number of adult workers per colony may be as high as 40,000. F. obscuripes feeds upon a number of insect species, consumes nectar from homopterous insects they tend, and occasionally eats plant tissue. In the Blue Mountains of Oregon, F. obscuripes has demonstrated the capacity for polydomy. A supercolony in a four-hectare study area near Lehman Hot Springs consisted of 210 active nests with an estimated population in excess of 56 million ants.
- Heikkinen, M. W. (1999). "Negative effects of the western thatching ant (Formica obscuripes) on spiders (Araneae) inhabiting big sagebrush (Artemisia tridentata)". Great Basin Naturalist 59 (4): 380–383.
- Capinera, J. L. (2008). Encyclopedia of Entomology, Volume 3. Springer. p. 4215. ISBN 978-1-4020-6242-1.
- McIver, et al.|"A supercolony of the thatch ant Formica obscuripes Forel (Hymenoptera:Formicidae) from the Blue Mountains of Oregon". Northwest Science 71 (1): 18–29. 1997.