Technomyrmex yamanei

AntWiki: The Ants --- Online
Technomyrmex yamanei
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Technomyrmex
Species: T. yamanei
Binomial name
Technomyrmex yamanei
Bolton, 2007

In Thailand, this species inhabits highlands (> 700 m a.s.l.), nests in rotten wood, and usually forages on ground or trees (Jaitrong & Yamane, 2014).

  • Jaitrong & Yamane (2024), Fig. 20. Technomyrmex yamanei (worker and intercaste). A–C, worker; D–F, intercaste; A, D, head in full-face view; B, E, body in profile; C, F, body in dorsal view. Photos by Yudthana Samung.

Identification

Bolton (2007) - A member of the T. modiglianii complex in the Technomyrmex albipes group. Closely related to Technomyrmex modiglianii but yamanei is easily separated by the distribution of setae on the head, the much deeper clypeal incision which is sharply angled where the inner margins of the incision meet the anterior clypeal margin, and by its extremely sparse, very short setae on the first gastral tergite.

Jaitrong & Yamane (2014) - Head in full-face view almost as long as broad, with posterior margin broadly and strongly emarginate across its width. Anterior clypeal margin with a long, U-shaped median notch; inner margin of concavity meets outer edge of anterior clypeal margin at an acute angle or tooth. With head in profile, eyes located in front of midlength of head. Mandibles without longitudinal groove. Propodeal declivity weakly convex. Dorsum of head behind level of posterior margin of eye with two pairs of erect setae, one located near posterior margin of head where some additional shorter setae are present; pronotum with 2–3 pairs of erect setae (often with much shorter additional hairs), mesonotum with 1–2 pairs; propodeum often without them (erect setae if any very short); erect setae on gastral tergites II and III sparse and very short, less than half length of antennal segment II. Body almost entirely dark brown to black; leg segments blackish brown, except for tarsi which are dull yellow.

Intercaste - Very similar to workers, but mesonotum modified to varying degree. The level of modification of the mesosoma is generally much weaker than in other species. In a few specimens there was an indistinct indentation on the head vertex where the anterior ocellus is usually located.

This species is most similar to Technomyrmex modiglianii. See there for details.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 18.98333° to 14.9°.

 
North
Temperate 		North
Subtropical 		Tropical South
Subtropical 		South
Temperate

Distribution based on Regional Taxon Lists

Oriental Region: Laos, Thailand (type locality), Vietnam.

Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

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.
pChart

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.
pChart

Biology

Castes

Nomenclature

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

  • yamanei. Technomyrmex yamanei Bolton, 2007a: 107, figs. 47, 67 (w.) THAILAND.

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

Description

Worker

Holotype. TL 4.0, HL 1.08, HW 1.01, SL 0.87, PW 0.64, WL 1.16. Indices: CI 94, SI 86, OI 20, EPI 83, DTI 118.

Frontal carina with 2 setae: in profile the anterior at the torulus (the posterior at about the level of the anterior margin of the eye; without a seta at level of posterior margin of eye. Behind level of posterior margin of eye there is a single pair of dorsal setae, in profile located about half the distance to the posterior margin of the head. Posterior margin itself has two pairs of setae close to the midline and a much shorter seta on each side, closer to the corners, All these cephalic setae are shorter than the maximum diameter of the eye. With head in full-face view the anterior clypeal margin with a long, U-shaped median incision; inner margin of incision meets the anterior clypeal margin in an acute angle on each side. Posterior margin of head broadly and strongly emarginate. Eyes small and located in front of the midlength, the outer margins of the eyes are set well in from the outline of the sides in full-face view. With mesosoma in profile the mesonotal outline is evenly curved, without a distinct step or angle in the outline that defines conspicuous dorsal and declivitous faces. Propodeal dorsum short in profile and convex, the straight-line length of the dorsum less than the depth of the declivity to the spiracle; the dorsum rounds narrowly but bluntly into the declivity. Number of setal pairs on mesosoma: pronotum 4 - 5; mesonotum 1; propodeal dorsum 0; lateral margins of propodeal declivity 0. Gastral tergite 1 with very sparse, minute inconspicuous setae that are only about 0.30 x the maximum diameter of the eye. Setae on gastral tergites 2 - 3 more numerous and slightly longer. Setae on gastral tergite 4 conspicuous and twice as long as those on tergites 1 - 2, Head, mesosoma, petiole and gaster black; leg segments blackish brown to black except for the tarsi which are dull yellow.

Other worker. TL 3.4 - 3.9, HL 0.88 - 1.07, HW 0.83 - 1.02, SL 0.72 - 0.86, PW 0.50 - 0.63, WL l.00 - 1.20 (4 measured). Indices: CI 94 - 100, SI 84 - 87, OI 19 - 22, EPI 81 - 93, DTI 120 – 124. As holotype but one worker with a single short seta on the propodeal declivity. Colour varies from blackish brown to black.

Type Material

Holotype worker, Thailand: Doi Chiang Dao, nr Chiang Mal, 700-800 m. alt., 3.iv.2005 (Sk. Yamane) (Kagoshima University, Faculty of Science). Paratypes. 2 workers with same data as holotype (KUIC, The Natural History Museum).

References

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.
  • Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
  • Jaitrong W., B. Guenard, E. P. Economo, N. Buddhakala, and S. Yamane. 2016. A checklist of known ant species of Laos (Hymenoptera: Formicidae). Asian Myrmecology 8: 1-32. DOI: 10.20362/am.008019
  • Zryanin V. A. 2011. An eco-faunistic review of ants (Hymenoptera: Formicidae). In: Structure and functions of soil communities of a monsoon tropical forest (Cat Tien National Park, southern Vietnam) / A.V. Tiunov (Editor). – M.: KMK Scientific Press. 2011. 277 р.101-124.
Retrieved from "https://antwiki.org/wiki/index.php?title=Technomyrmex_yamanei&oldid=722556"