Technomyrmex obscurior

AntWiki: The Ants --- Online
Technomyrmex obscurior
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Technomyrmex
Species: T. obscurior
Binomial name
Technomyrmex obscurior
Wheeler, W.M., 1928

Technomyrmex obscurior casent0249798 p 1 high.jpg

Technomyrmex obscurior casent0249798 d 1 high.jpg

Specimen Labels

A collection of this species was made in a Schima-Castanopsis forest, with the ants being found under a stone.

Identification

Bolton (2007) - A member of the Technomyrmex bicolor group. The few samples currently grouped under this name, although coming from a relatively restricted area, show considerable variation in scape length, eye size, development of clypeal sculpture, degree of separation of metathoracic spiracle from metanotal groove and length of propodeal dorsum. It seems probable that further collections will allow a better resolution of the taxonomy. However, it should be noted that some characters are known to show variation in other species of the group and so would not certainly have species-rank value here. For instance SI shows notable variation in single series of Technomyrmex impressus, where the smallest workers have relatively much longer scapes than the largest.

The closest related species to obscurior is Technomyrmex antennus, but the latter has a short, deep propodeum and differently coloured middle and hind coxae.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 28.330172° to 21.752698°.

   
North
Temperate
North
Subtropical
Tropical South
Subtropical
South
Temperate

Distribution based on Regional Taxon Lists

Oriental Region: Myanmar, Nepal.
Palaearctic Region: China (type locality).

Distribution based on AntMaps

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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.
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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.
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Biology

Castes

Nomenclature

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

  • obscurior. Technomyrmex schimmeri var. obscurior Wheeler, W.M. 1928c: 31 (w.) CHINA. Raised to species: Bolton, 2007a: 94.

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 3.2 - 3.8, HL 0.71 - 0.96, HW 0.63 - 0.86, SL 0.90 - 1.05, PW 0.45 - 0.55, WL 0.95 - 1.35 (15 measured). Indices: CI 84-93, SI 122 - 143, OI 23 - 32, EPI 67 - 80, DTI 156 - 168.

Head behind clypeus, dorsum of mesosoma, declivity of propodeum and first gastral tergite all entirely lack setae. Gastral tergites 2 - 4 with long 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 that is semicircular to broadly U-shaped. The margins of the notch meet the lateral portions of the anterior margin through rounded curves, not sharp angles. Posterior margin of head indented medially. With head in full-face view the outer margins of the eyes fail to touch the outline of the convex sides of the head. Scape index > 120. Clypeal sculpture usually relatively coarse between posterior margin of notch and clypeal suture, usually shallowly reticulate-punctulate and generally more strongly developed than in the area between the frontal carinae. In dorsal view the metathoracic spiracles distinctly separated from the metanotal groove; distance separating them more than one spiracle diameter, usually obviously so. Mesosoma relatively long, DTI 156 - 168, usually > 160. In profile the propodeal dorsum long, flat or even slightly concave, its straight-line length greater than the depth of the declivity to the spiracle. In profile the head, mesosoma, petiole and gaster all the same shade of dark brown to blackish brown, or very nearly so. Anterior coxa brown; middle and hind coxae ivory-white to yellow and strongly contrasting with the mesosoma. All trochanters yellow. Femora and tibiae mostly brown, same colour as the mesosoma or slightly lighter but base and apex of each segment dull yellow. Tarsi off-white to yellow, lighter than the central portions of the femora and tibiae.

Type Material

Bolton (2007) - Syntype workers, China: Yi Leang (= Yiliang, Kunming Prov.?), 27.ii.1925 (F. Silvestri) (Museum of Comparative Zoology) [examined].

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
  • Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
  • Skarbek C. J., M. Noack, H. Bruelheide, W. Hardtle, G. von Oheimb, T. Scholten, S. Seitz, M. Staab. 2019. A tale of scale: plot but not neighbourhood tree diversity increases leaf litter ant diversity. Journal of Animal Ecology DOI: 10.1111/1365-2656.13115
  • Staab M., A. Schuldt, T. Assmann, H. Bruelheide, and A.M. Klein. 2014. Ant community structure during forest succession in a subtropical forest in South-East China. Acta Oecologia 61: 32-40.