Distribution: North America, South America, Southern Asia, Madagascar, Australia.
From Ant Web
It's not surprising that the males seem to lack the petal-like structures on the body. Has anyone studied why some species have larger petals than others, and less of them?
The genus Eurhopalothrix occurs in the Neotropics and in the Indo-Australian-southwestern Pacific area (Brown and Kempf 1960). They are members of the "cryptobiotic" fauna: small, slow ants that live in rotten wood and leaf litter. They are predators, preying on small, soft-bodied arthropods (Wilson 1956, Brown and Kempf 1960, Wilson and Brown 1985).
Workers and nests are extremely difficult to see in the field, because the workers are camouflaged and very slow moving. On disturbance they freeze, often curling into a pupal position, and remain motionless for several minutes (Wilson and Brown 1985, Hoelldobler and Wilson 1986). As a result of their cryptic nature, they were considered extremely rare until the 1960's. But increasing use of Winkler and Berlese sampling has shown Eurhopalothrix to be relatively common. I encounter them in most Winkler samples from wet forest sites in Costa Rica.
In Costa Rica, I know this species from (1) 2 Berlese samples from La Selva Biological Station; (2) a worker on rotten wood at La Selva; (3) a Winkler sample from wet forest at C.A.T.I.E. near Turrialba; (4) workers in a rotten log at Hitoy Cerere Biological Reserve; and (5) a Winkler sample from wet forest near the headquarters at Carara Biological Reserve.