Anillomyrma tridens

Bolton (1987) tentatively suggested that A. tridens is nomadic.

Identification
Eguchi et al. (2009) - Body sculpture absent except for hair-pits, which are most conspicuous on head and promesonotum; dorsum of head, promesonotum and gaster relatively densely covered with short suberect to decumbent hairs. Head in full-face view roughly rectangular, longer than broad; mandible with three large sharp teeth. Apical and preapical teeth close together, separated by a diastema from 3rd tooth; 3rd much larger than 2nd; antennal scape short, reaching only 7 / 10 - 3 / 4 of distance from anterior margin of clypeus to posterior margin of head; apical antennal segment more than 3 times as long as preapical segment. Dorsum of mesosoma in lateral view flat. Dorsum and posterior slope of propodeum in lateral view forming rounded outline. Petiolar peduncle in lateral view relatively slender.

Anillomyrma tridens is morphologically very similar to Anillomyrma decamera. The only conspicuous morphological characters separating the two species are as follows: head slightly longer than broad, masticatory margin of mandible of A. tridens having 3 distinct teeth as mentioned by Bolton (1987) (but very small 4th tooth rarely present); the 3rd tooth of A. tridens much larger than 2nd; posterior slope of propodeum in lateral view ex-panding posterodorsad more strongly in A. tridens than in A. decamera; petiolar peduncle in lateral view more slender in A. tridens than in A. decamera.

Distribution
Malaysia: Sarawak.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Borneo, Indonesia.

Castes
Known only from the worker caste.

Nomenclature

 *  tridens. Anillomyrma tridens Bolton, 1987: 274, figs. 1, 4 (w.) BORNEO. See also: Eguchi, Bui, et al. 2009: 36.

Worker
Holotype and 10 paratype workers (cited from BOLTON 1987): CI 88 - 90, HL 0.37 - 0.39, HW 0.33 - 0.36, PW 0.24 - 0.25, SI 57 - 60, SL 0.21 - 0.23, WL 0.35 - 0.39.

Type Material
Holotype worker: East Malaysia: Sarawak, 4th Division, Gunong Mulu Nat. Park, RGS Exped., Long Pala, lowland rain forest in sandy soil, leg. B. Bolton, 11.X.1977 ; para-types: workers with same data as holotype (BMNH,, , NMB). Fifteen paratypes (personally donated to by B. Bolton) and 9 paratypes (MCZC) examined.