Technomyrmex sundaicus

Technomyrmex sundaicus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Dolichoderinae
Genus:	Technomyrmex
Species:	T. sundaicus
Binomial name
	Technomyrmex sundaicus; (Emery, 1900) Specimen Labels

A worker was collected in a Sabah swamp-forest litter sample. In Thailand, Jaitrong & Yamane (2014) found this to be a rare species; they found a colony in dead wood in a lowland evergreen forest.

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.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 12.766089° to -0.5°.


North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

Source: AntMaps

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia (type locality), Malaysia, Philippines.
Oriental Region: Thailand.

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Jaitrong & Yamane (2024), Fig. 22. Distribution of Technomyrmex horni, T. lisae, T. schimmeri, and T. sundaicus in Thailand.

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Castes

Jaitrong & Yamane (2024), Fig. 31. Technomyrmex sundaicus (worker). A, body in profile; B, head in full-face view; C, body in dorsal view. Photos by Yudthana Samung.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

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

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

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) (Museo Civico di Storia Naturale, Genoa) [examined].

References

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):1-149.
Emery, C. 1900d. Formiche raccolte da Elio Modigliani in Sumatra, Engano e Mentawei. [part]. Ann. Mus. Civ. Stor. Nat. 40[=(2(20): 689-720 (page 695, fig. 10 worker described)
General, D.E.M. 2021. A preliminary checklist of the ants (Hymenoptera: Formicidae) of the Mt. Pantaron Range, Bukidnon Province, Mindanao Island, Philippines. Halteres, 12:4-14 (doi:10.5281/ZENODO.5371745).
General, D.E.M., Buenavente, P.A.C., Rodriguez, L.J.V. 2020. A preliminary survey of nocturnal ants, with novel modifications for collecting nocturnal arboreal ants. Halteres 11: 1-12 (doi:10.5281/ZENODO.3707151).
Jaitrong, W., Yamane, S. 2024. A revision of the ants Technomyrmex Mayr, 1872 (Hymenoptera: Formicidae: Dolichoderinae) in Thailand and Laos. Natural History Bulletin of the Siam Society 66 (1): 29–118.
Shattuck, S. O. 1992c. Generic revision of the ant subfamily Dolichoderinae (Hymenoptera: Formicidae). Sociobiology 21: 1-181 (page 161, Combination in Technomyrmex)

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.