Technomyrmex elatior

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Technomyrmex elatior
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Technomyrmex
Species: T. elatior
Binomial name
Technomyrmex elatior
Forel, 1902

Technomyrmex elatior casent0249783 p 1 high.jpg

Technomyrmex elatior casent0249783 d 1 high.jpg

Specimen Labels

Synonyms

Found on trees and nests in rotten parts of the trunk.

Identification

Bolton (2007) - A member of the T. modiglianii complex in the Technomyrmex albipes group. Superficially similar to Technomyrmex albipes and Technomyrmex vitiensis but with a broader head that is much more extensively and deeply emarginate posteriorly, more like the shape of Technomyrmex modiglianii. The anterior clypeal margin has a small but distinct shallow semicircular notch and the eyes are farther removed from the outline of the sides of the head in full-face view. The metathoracic spiracle, usually on a small but prominent tubercle, projects more dorsally than in either albipes or vitiensis and is conspicuous in profile in most samples.

T. elatior is probably most closely related to, and has also been confused with modiglianii because of its head shape and median clypeal notch, but elatior always lacks setae on the dorsum of the head behind the level of the posterior margin of the eye and has the main setae on the first gastral tergite distinctly much shorter than the maximum diameter of the eye.

This widely distributed taxon is size-variable as thus defined and may contain more than one species. In particular specimens from Sarawak tend to be larger (the largest - HL 0.84 - 0.88, HW 0.84 - 0.93), have the shortest scapes (SI 84 - 86) and have the eyes located more anteriorly (EPI 50 - 57) than the other populations. The last ratio is particularly striking as the other material in combination has EPI 63 - 73. However, because of shortage of examples and their otherwise similar morphology all are currently being retained as a single species.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Brunei Darussalam, Indonesia, Malaysia, Philippines, Singapore.
Oriental Region: Cambodia, India (type locality), Nepal, Sri Lanka, Vietnam.
Palaearctic Region: China, Italy.

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Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • elatior. Technomyrmex modiglianii r. elatior Forel, 1902d: 293 (w.) INDIA. Forel, 1908a: 3 (m.). Subspecies of modiglianii: Forel, 1905c: 23; Wheeler, W.M. 1921c: 541. Raised to species: Bingham, 1903: 302; Mukerjee, 1930: 155. Senior synonym of cordiformis: Bolton, 2007a: 79.
  • cordiformis. Technomyrmex albipes var. cordiformis Viehmeyer, 1916a: 143 (w.) SINGAPORE. Junior synonym of elatior: Bolton, 2007a: 79.

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 - 3.7, HL 0.65 - 0.88, HW 0.62 - 0.93, SL 0.59 - 0.78, PW 0.41 - 0.56, WL 0.78 - 1.00 (20 measured). Indices: CI 95 - 106, SI 84 - 98, OI 20 - 26, EPI 50 -73, DTI 112 - 128.

Frontal carina with 2 (rarely 3) setae. Dorsum of head behind level of eye entirely lacks setae. Anterior clypeal margin with a small but incised and sharply defined shallow semicircular median notch; inner margin of notch does not meet the anterior clypeal margin in an acute angle or tooth. Posterior margin of head in full-face view is broadly emarginate across its width, not merely with a median impression; depth and intensity of emargination increases with size, being most pronounced in the largest individuals. Sides of head convex and 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 the straight-line length of the dorsum less than the depth of the declivity to the spiracle; dorsum and declivity meet in an angle. Number of setal pairs on mesosoma: pronotum 2 - 3; mesonotum usually 1, located quite close to the metathoracic spiracle, but rarely a more anterior pair may also be present; propodeal dorsum 0; lateral margins of propodeal declivity 2 - 3. Gastral tergites 1 - 4 each with numerous setae all over the sclerites; these setae relatively short, the longest on the first gastral tergite only about 0.50 x the maximum diameter of the eye. Head, mesosoma, petiole and gaster dark brown to black; leg segments approximately the same colour as head and body except for the tarsi, which are yellowish.

Type Material

Bolton (2007) - Syntype workers, India: Assam, LXXIX/I6 (Long) (Musee d'Histoire Naturelle Genève) [examined].

References

  • Bingham, C. T. 1903. The fauna of British India, including Ceylon and Burma. Hymenoptera, Vol. II. Ants and Cuckoo-wasps. London: Taylor and Francis, 506 pp. (page 302, Raised to species)
  • 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.
  • Forel, A. 1902d. Variétés myrmécologiques. Ann. Soc. Entomol. Belg. 46: 284-296 (page 293, worker described)
  • Forel, A. 1905f. Ameisen aus Java. Gesammelt von Prof. Karl Kraepelin 1904. Mitt. Naturhist. Mus. Hambg. 22: 1-26 (page 23, Race/subspecies of modiglianii)
  • Forel, A. 1908b. Fourmis de Ceylan et d'Égypte récoltées par le Prof. E. Bugnion. Lasius carniolicus. Fourmis de Kerguelen. Pseudandrie? Strongylognathus testaceus. Bull. Soc. Vaudoise Sci. Nat. 44: 1-22 (page 3, male described)
  • Mukerjee, D. 1930. Report on a collection of ants in the Indian Museum, Calcutta. J. Bombay Nat. Hist. Soc. 34: 149-163 (page 155, Raised to species)
  • Wheeler, W. M. 1921c. Chinese ants. Bull. Mus. Comp. Zool. 64: 529-547 (page 541, Race/subspecies of modiglianii)