Acropyga dubia

Nothing is known about the biology of this species.

Identification
LaPolla (2004) - Worker: 11 segmented antennae; mandible with 6 teeth; head slightly longer than broad; dorsum with dense layer of appressed hairs, with occasional scattered erect hairs. Queen: as in worker with modifications expected for caste. Male: unknown. Compare with Acropyga myops.

This species has workers that are morphologically similar to Acropyga myops, but differ primarily in possessing a narrower head (< 0.6 mm in A. dubia versus > 0.6 mm in A. myops), and in geographical distribution (A. dubia has not been found in Australia, the only known location for A. myops).

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

LaPolla (2004): I have only examined specimens of this species from Malaysian Borneo, though the original description reports the syntypes as being from Sumatra.

Castes
Males are not known for this species.

Nomenclature

 *  dubia. Acropyga (Rhizomyrma) dubia Karavaiev, 1933a: 311, fig. 3 (w.m.) INDONESIA (Sumatra). LaPolla, 2004a: 61 (q.).

Worker
LaPolla (2004) - (n=8): TL: 1.79-2.15; HW: 0.485-0.55; HL: 0.499-0.585; SL: 0.399-0.447; ML: 0.538-0.611; GL: 0.623-0.957; CI: 89.91-97.21; SI: 79.89-81.81.

Head: yellow; head slightly longer than broad; posterior margin entire to slightly concave medially; 11 segmented, incrassate antennae; scape reaches or nearly reaches (approximately 1/3 length of pedicel) posterior margin; clypeus convex medially, with appressed to erect hairs on surface; mandible broad with 6 teeth; 3rd tooth from apical smaller than others; basal tooth sometimes smaller than others and set back further than other teeth on masticatory margin; dorsal surface of mandible covered in a thick layer of short erect hairs (approximately 25 hairs); inner mandibular margin and anterior clypeal margin nearly parallel with each other. Mesosoma: yellow; in lateral view pronotum rises steeply toward mesonotum; pronotum covered in layer of appressed hairs, with scattered erect hairs posteriorly; mesonotum rounded, covered in layer of appressed hairs; scattered erect hairs throughout; metanotal area distinct; propodeum rounded, covered in layer of appressed hairs; declivity steep. Gaster: petiole thick and erect, reaching height of upper portion of propodeal spiracle; gaster yellow; covered in a thick layer of appressed hairs, with scattered erect hairs throughout.

Queen
LaPolla (2004) - (n=1): TL: 3.06; HW: 0.663; HL: 0.6; SL: 0.606; ML: 1.1; GL: 1.36; CI: 110.5; SI: 91.40. As in worker with modifications expected for caste and with the following differences: overall color brownish-yellow, darker toward apex of head and on gaster dorsum.

Type Material
LaPolla (2004) - Acropyga dubia Karavaiev, 1933: 311 (w.m.). 3 syntype workers, 1 syntype male, INDONESIA: Sumatra (O. John) (depository unknown) [not examined]. The syntypes of this species could not located for examination. The original description includes description of a male, but because the syntypes could not be located and no other male specimens have been found in collections, the male unfortunately cannot be described at this time.