Technomyrmex sundaicus

A worker was collected in a Sabah swamp-forest litter sample.

Identification
Bolton (2007) - A member of the Technomyrmex bicolor group. Very similar to Technomyrmex kraepelini, but sundaicus is separated by its uniform drab brown colour and the fact that the middle and hind coxae are approximately the same colour as the mesosoma, rather than strongly contrasting as is the case in kraepelini.

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

Nomenclature

 *  sundaicus. Tapinoma sundaicum Emery, 1900d: 695, fig. 10 (w.) INDONESIA (Sumatra). Combination in Technomyrmex: Shattuck, 1992c: 161. See also: Bolton, 2007a: 101.

Worker
Bolton (2007) - TL 2.9 - 3.9, HL 0.74 - 1.01, HW 0.68 – 1.00, SL 0.74 - 0.88, PW 0.44 - 0.57, WL 0.95 - 1.16 (10 measured). Indices: CI 92 - 100, SI 88 - 108, OI 20 - 24, EPI 62 - 78 DTI 133 - 136.

Head behind clypeus, dorsum of mesosoma, declivity of propodeum and first gastral tergite all entirely lack setae. Gastral tergites 2 - 4 with stout setae present that are slightly longer than the maximum diameter of the eye: second gastral tergite with 2 – 3 pairs, third and fourth tergites each with 3 - 4 pairs. Anterior clypeal margin with a distinct median notch, the margins of which meet the lateral portions of the anterior margin through rounded curves, not sharp angles. Posterior margin of head deeply concave medially, the extent of the indentation becomes more pronounced in larger workers and in full-face view the head becomes distinctly more cordate with increased size. With head in full-face view the outer margins of the eyes fail to touch the outline of the sides of the head; the latter convex, more strongly so in larger workers. Scape index 88 - 108. Clypeal sculpture fine between posterior margin of notch and c1ypeal suture. In dorsal view the metathoracic spiracles close to, or even abutting, the metanotal groove; distance separating them about one spiracle diameter at most. Mesosoma relatively stout, DTI 133 - 136. In profile the straight-line length of the propodeal dorsum distinctly less than the depth of the declivity to the spiracle; dorsal outline of propodeum without a conspicuous notch or indentation at about its midlength. In profile the head, mesosoma, petiole and gaster all a uniform shade of drab brown. All coxae, femora ana tibiae brown, the same colour as the mesosoma or nearly so. All trochanters, and middle and hind tarsi lighter, dull yellow.

Type Material
Bolton (2007) - Syntype workers, Indonesia: Sumatra, Si Rambe, xii.90 - iii.91 (E. Modigliam) and D. Toiong. xi.1890 (E. Modigliani) [examined].

References based on Global Ant Biodiversity Informatics

 * Bolton B. 2007. Taxonomy of the dolichoderine ant genus Technomyrmex Mayr (Hymenoptera: Formicidae) based on the worker caste. Contributions of the American Entomological Institute 35(1): 1-150.
 * Bolton, B. "Taxonomy of the dolichoderine ant genus Technomyrmex Mayr (Hymenoptera: Formicidae) based on the worker caste." Contributions of the American Entomological Institute 35, no. 1 (2007): 1-149.
 * 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
 * Emery C. 1913. Hymenoptera. Fam. Formicidae. Subfam. Dolichoderinae. Genera Insectorum 137: 1-50.
 * Emery C. Formiche raccolte da Elio Modigliani in Sumatra, Engano e Mentawei. Annali del Museo Civico di Storia Naturale 40: 661-722.
 * Emery, C. "Formiche raccolte da Elio Modigliani in Sumatra, Engano e Mentawei." Annali del Museo Civico di Storia Naturale Giacomo Doria (Genova) (2) 20, no. 40 (1900): 661-722.
 * 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
 * Shattuck S. O. 1994. Taxonomic catalog of the ant subfamilies Aneuretinae and Dolichoderinae (Hymenoptera: Formicidae). University of California Publications in Entomology 112: i-xix, 1-241.
 * Wheeler W. M. 1937. Additions to the ant-fauna of Krakatau and Verlaten Island. Treubia 16: 21-24.