These are large, long-legged ants. Despite their rather fierce appearance, they were not at all aggressive toward me. I actually had to tease them out of their nest opening for a photo ... this one I enticed onto a stick.

see iNaturalist record

A relative of the Green-head Ant, and like their relatives they have a sting. And wrinkled-looking skin ... 'rhytid' is a medical term for wrinkles ... making this genus quite recognisable in the field (ref. 4).

This species does build an obvious mound. The opening was a ragged tear in the soil, the galleries visible just below the surface. This is consistent with descriptions of newly-established colonies. Mature nests extend around a metre below ground (ref. 5), so the galleries are less obvious.

Mature colonies may contain hundreds of workers (ref. 5) ... but not the thousands of meat ant colonies!

Just inside the nest opening, several workers were carrying larvae from one part of the nest to another.