Rotastruma recava

Bolton noted that nests contained more than one dealate queen. Specimens have been collected in rainforest from dead twigs.

Identification

 * With head in full-face view the occipital margin conspicuously concave, the sides of the head convex. (Singapore; East Malaysia: Sarawak) . . . . . Rotastruma recava


 * With head in full-face view the occipital margin more or less transverse, the sides of the head approximately straight. (China: Guangdong) . . . . . Rotastruma  stenoceps

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

Nomenclature

 *  recava. Rotastruma recava Bolton, 1991: 9, figs. 12, 14 (w.q.) BORNEO.

Worker
Holotype. TL 3.6, HL 0.80, HW 0.69, CI 86, SL 0.56, SI 81, PW 0.48, AL 0.94. Maximum diameter of eye 0.24 (0.35 x HW). Mandibles finely longitudinally striolate. Central strip of dorsum of head with a number of longitudinal costulae which may run the length of the head or may be broken or interrupted. Occipital margin distinctly concave in full-face view, the sides of the head in front of the large eyes convex. Median portion of clypeus with 3 longitudinal carinae. Dorsal alitrunk with predominantly longitudinal sharp rugulae; cross-meshes present, especially on pronotum. Sides of alitrunk marginate, margination sharpest on mesonotum and propodeum. Propodeal spines long, depressed and down-curved along their length. Sides of alitrunk with weak longitudinal rugulae. Petiole and postpetiole rugulose to reticulate-rugulose dorsally. First gastral tergite unsculptured except for sparse short basi gastral costulae and feeble superficial reticular patterning. Standing hairs present on all dorsal surfaces, short fine and acutely pointed. Colour yellow, the first gastral tergite with a broad brown band.

Paratype. TL 3.6-4.0, HL 0.80-0.84, HW 0.66-0.70, CI83-86, SL 0.56-0.60, SI 81-86, PW 0.48-0.52, AL 0.94-1.02. Maximum diameter of eye 0.24-0.26 (0.35-0.37 x HW) (10 measured). As holotype.

Queen
Paratype. TL 3.9-4.0, HL 0.80-0.81, HW 0.69-0.70, CI 85-86, SL 0.54-0.56, Sl 78-81, PW 0.56-0.58, AL 1.08-1.12. Maximum diameter of eye 0.26-0.28 (0.37-0.40 x HW) (4 measured). The females are small, only the same size as the workers or slightly larger. Alate when virgin and with a complete complement of flight sclerites.

Type Material
Holotype worker, East Malaysia: Sarawak, 4th Division G. Mulu NP, 22.v.1978, mixed dipterocarp forest, on tree (N. M. Collins).

Paratypes, 18 workers and 2 females, Singapore: Bukit Timah Forest, 15.iii.1973 (D. H. Murphy); 2 workers and 2 females, Bukit Timah, 100 m, 8.iv.1989, no. 10254, ex dead twig, vine, rainforest (P. S. Ward) (BMNH; ; ).

References based on Global Ant Biodiversity Informatics

 * Bolton B. 1991. New myrmicine genera from the Oriental Region (Hymenoptera: Formicidae). Systematic Entomology 16:1-13.
 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
 * Zryanin V. A. 2011. An eco-faunistic review of ants (Hymenoptera: Formicidae). In: Structure and functions of soil communities of a monsoon tropical forest (Cat Tien National Park, southern Vietnam) / A.V. Tiunov (Editor). – M.: KMK Scientific Press. 2011. 277 р.101-124.