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.

References based on Global Ant Biodiversity Informatics

 * Chapman, J. W., and Capco, S. R. 1951. Check list of the ants (Hymenoptera: Formicidae) of Asia. Monogr. Inst. Sci. Technol. Manila 1: 1-327
 * Karavaiev V. 1933. Ameisen aus dem Indo-Australischen Gebiet, VII. Konowia 11: 305-320.
 * LaPolla J.S. 2004. Acropyga (Hymenoptera: Formicidae) of the world. Contributions of the American Entomological Institute 33(3): 1-130.
 * 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