Taxonomy. The genus Anillomyrma was classified in the Solenopsis genus group of the tribe Solenopsidini by Bolton(2003). Workers of Vietnamese species have the following features (see Bolton 1981, Eguchi et al. 2010).
Worker monomorphic; body extensively depigmented, weakly sclerotized; frontal lobe in full-face view only partially concealing torulus, not extending posteriorly as frontal carina; antennal scrobe absent; median portion of clypeus not bicarinate laterally below antennal insertion, narrowly inserted between frontal lobes; median clypeal seta well developed; mandible elongate-triangular, with 4 teeth on masticatory margin (with 3-4 teeth if the world species are included); a short diastema present between preapical and 3rd teeth; antenna 10-segmented with 3-segmented club; eye completely absent; mesosoma in lateral view low, almost flat or very weakly convex dorsally; promesonotal suture completely absent dorsally; metanotal groove present dorsally as a weak transverse striation; propodeum neither armed posterodorsally nor carinate posterolaterally; propodeal lobe absent; fore coxa robust, and much longer than middle and hind coxa; petiolar peduncle long, without any anteroventral process; petiolar node long, low and dorsally broadly convex in lateral view; postpetiole in lateral view broadly attached to top of anterior face of first gastral segment; gaster elongate; gastral shoulder absent; sting strongly developed.
The worker of Anillomyrma is most similar to Monomorium , but in the latter the antenna is 11- or 12-segmented, the postpetiole is attached to the center of the anterior face of the gaster, and gaster is not elongate.
Vietnamese species. Only one species has been found from Vietnam: decamera (Emery) (Binh Chau - Phuoc Buu, Van Phu [type locality of " A. decamera continentis Wheeler "]).
Bionomics . We collected workers of Anillomyrma decamera in a well-developed dry forest in the southern coastal part of Vietnam, by underground bait-trapping. Baits (pork sausage) were buried in sandy soil (for details see Eguchi & Bui 2009).