Crematogaster tumidula

This species is known from Malaysia (Borneo) and Indonesia (Kalimantan, Sumatra).

Identification
Hosoishi (2015): This species is similar to Crematogaster ebenina, but differs in having developed anterolateral corners of the petiole. It is also similar to Crematogaster pia, but differs in having short and stout propodeal spines and the basal portion with smooth surface.

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

Nomenclature

 *  tumidula. Crematogaster tumidula Emery, 1900d: 689, fig. 8 (w.) INDONESIA (Sumatra). Combination in C. (Physocrema): Emery, 1922e: 140; Donisthorpe, 1941l: 226; In C. (Oxygyne): Hosoishi & Ogata, 2009b: 33.

Worker
Hosoishi (2015) - (workers, n = 10). HW 0.73-0.88; HL 0.72-0.86; CI 101-107; SL 0.60-0.77; SI 80-88; EL 0.15-0.19; PW 0.43-0.53; WL 0.80-0.97; PSL 0.08-0.12; PtL 0.20-0.26; PtW 0.23-0.27; PtH 0.14-0.18; PpL 0.14-0.22; PpW 0.20- 0.28; PtHI 54-68; PtWI 89-113; PpWI 125-178; WI 88-118.

Head appearing subquadratic in front view. Mandible weakly striate, with four teeth, apical and subapical teeth large, basal two teeth smaller. Scape exceeding posterior corner of head, with appressed setae, each of which is less than width of scape in length. Compound eye large and slightly projecting beyond lateral margin of head in full face view.

Ventrolateral katepisternal ridge indistinct posteriorly. Propodeal spine short and stout; length as long as spiracle, directed posteriorly, dorsum as high as anterior propodeum; basal width smaller than spiracles in diameter. Propodeal spiracle large, situated close to propodeal declivity in lateral view, directed laterally or posterolaterally.

In dorsal view, shape of petiole scoop with convex side, longer than broad. Anterolateral corner of petiole developed. Petiolar spiracle as large as half of propodeal spiracle in diameter, directed laterally. Postpetiole bilobed but without longitudinal median sulcus. Postpetiole as wide as petiole in dorsal view.

Integument essentially smooth and shiny. Clypeus smooth and shiny without rugulae. Malar region smooth and shiny. Dorsal surface of promesonotum smooth and shiny. Lateral surface of pronotum smooth and shiny. Mesopleuron and lateral propodeum generally smooth, but with feable rugulae. Dorsal surface of propodeum smooth and shiny; anterior dorsum smooth without rugulae.

Erect pilosity almost absent. Dorsum of head, clypeus and mesosoma with short and appressed sparse setae. Clypeus with one pair of longer setae on anteriormost portion, directed medially. Anterior clypeal margin with two pairs of longer setae on median portion, mixed with some shorter setae on side. No erect setae on pronotal shoulder. Posterolateral tubercle with some appressed shorter setae. Ventral surface of petiole with appressed setae. Postpetiole with some appressed setae. Fourth abdominal tergite with appressed setae.

Body color reddish brown.