Pogonomyrmex subdentatus worker with caddidsfly.

This lesser-known Pogo is found in California, extreme SW Oregon, and parts of Nevada, USA.

In many ways, this ant resembles P. salinus, and the two are probably closely related. Both are members of the 'occidentalis complex'.

Pogonomyrmex subdentatus workers average about 6mm in length, and are of a uniform red, or brownish-red color.

The appearance of the propodeal spines is variable, ranging from small denticles, to long spines. The specific name subdentatus refers to the tooth-like ventral process of the petiole (see illustration below).

P. subdentatus workers forage individually, sometimes recruiting nestmates to exploit a food source. Seeds and other plant parts are collected, and insects and insect parts are also scavenged. Nests are extremely variable, made of sand and gravel, often with no distinct form, and often with more than one entrance. At one location, nests were observed in hard, rocky soil, gravelly sand, and built of fine sand among dunes. Nests can contain several hundred workers.

[image below - yellow arrow indicates petiolar ventral process, or 'tooth', white arrow points to blunt postpetiolar ventral process - both present in Pogonomyrmex subdentatus workers, though exact form and development of features can vary]

Petiolar, and postpetiolar ventral processes og Pogonomyrmex subdentatus.

[IMAGE - TOP: P.subdentatus worker with caddis fly, in northern Nevada, USA] [scroll down for additional notes/references]

References for entire page :
·Cole, A.C. 1968. Pogonomyrmex Harvester Ants: A Study of the Genus in North America. Knoxville, University of Tennessee Press
·Johnson, R.A. 2000. Seed Harvesting Ants (Hymenoptera: Formicidae) of North America: An Overview of Ecology and Biogeography. Sociobiology Vol.36, No. 1, 2000
·Olsen, O.W. 1934. No. 8 - Notes on the North American Harvesting Ants of the Genus Pogonomyrmex Mayr. Cambridge, Mass. Bulletin of the Museum of Comparative Zoology at Harvard College, Vol. LXXVI, No. 8
·Taber, S.W. 1998. The World of the Harvester Ants. College Station, TX, Texas A&M University Press