Cyphomyrmex rimosus (Spinola)

Ants in the genus Cyphomyrmex are in the tribe Attini, along with Atta and Trachymyrmex, which are also found in the southern United States. Species in this genus are small, monomorphic ants that vary in color from dull light brown to blackish brown. The frontal lobes are conspicuous and expanded laterally and cover the antennal bases as well as much of the front of the head (see photo above, frontal view). The eyes are well developed. The antennae are 11 segmented and lack an apical club. The body is strongly sculptured and there are rounded tubercles present on the dorsum of the alitrunk (see photo of side view of worker above). Numerous appressed, scale-like hairs are present on the body and the appendages.

This species should not be confused with any other species in Alabama or Mississippi. The closest relative of it that has been found in these states is Trachymyrmex septentrionalis, which differs by being lighter brown, larger, and having jagged, irregularly shaped projections on the dorsum of the alitrunk.

Cyphomyrmex rimosus is a small, blackish colored exotic species found mostly in the southern halves of both Alabama and Mississippi. Like other Attines, Cyphomyrmex, grows subterranean fungus gardens, which are grown on a substrate of vegetable matter and dead insects. This species is very common in open habitats such as pastures and also in open woodlands such as longleaf pine forests. We have found colonies in the soil under rocks, logs, cow manure, or other objects.