Technomyrmex ilgi

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Technomyrmex ilgi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Technomyrmex
Species: T. ilgi
Binomial name
Technomyrmex ilgi
(Forel, 1910)

Technomyrmex ilgi casent0178276 profile 1.jpg

Technomyrmex ilgi casent0178276 dorsal 1.jpg

Specimen labels

Synonyms

T. ilgi has been found nesting in soil and under rotten wood, and under the loose bark of fallen logs. It forages in the soil and leaf litter but also ascends shrubs and low vegetation, where it tends homopterous insects. (Bolton 2007)

Identification

Bolton (2007) - This species resembles Technomyrmex lasiops but the two are easily separated by the characters given in the key. The most obvious difference lies in their respective palp formulae, PF 6,4 in ilgi but PF 5,3 in lasiops.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Democratic Republic of Congo, Ethiopia (type locality), Kenya, Mozambique, South Africa, Uganda, Zimbabwe.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • ilgi. Engramma ilgi Forel, 1910c: 264 (w.m.) ETHIOPIA. Combination in Technomyrmex: Shattuck, 1992c: 160. Senior synonym of gowdeyi, stygium: Bolton, 2007a: 23.
  • stygium. Engramma stygium Santschi, 1911c: 363 (w.m.) KENYA. Santschi, 1914b: 117 (q.). Combination in Technomyrmex: Shattuck, 1992c: 161. Subspecies of ilgi: Santschi, 1914b: 117. Junior synonym of ilgi: Bolton, 2007a: 23.
  • gowdeyi. Engramma gowdeyi Wheeler, W.M. 1922a: 207, fig. 53 (w.) DEMOCRATIC REPUBLIC OF CONGO. Combination in Technomyrmex: Shattuck, 1992c: 160. Junior synonym of ilgi: Bolton, 2007a: 23.

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 2.7 - 3.5, HL 0.70 - 0.87, HW 0.70 - 0.85, SL 0.58 - 0.70, PW 0.45 - 0.58, WL 0.78 - 1.04 (15 measured). Indices: CI 96 - 100, SI 82 - 87, OI 21 - 25, EPI 80 - 90, DTI 100 -112.

Dorsum of head behind clypeus with only 2 pairs of setae: in profile the anterior pair located at about the level of the anterior margin of the eye, the second pair at the posterior margin of the head; both pairs slightly shorter than the maximum diameter of the eye. (In a single worker another, much shorter, single seta (not paired) was present closer to the torulus.) Head in full-face view short and broad. Eyes small, located just in front of the midlength and their outer margins set well in from the outline of the sides. Anterior clypeal margin with a conspicuous semicircular to short U-shaped median notch; inner margin of notch meets anterior clypeal margin in a sharp angle on each side. Posterior margin of head broadly shallowly impressed across its width, usually most indented medially. Scape relatively short, SI < 90 in material examined. Mesosoma short and stocky (DTI < 120), very stoutly built; metanotal groove sharply but only shallowly impressed. Propodeum in profile with the dorsum short, the declivity long and sloping. Number of setal pairs on mesosoma: pronotum 1 - 3; mesonotum 2 - 3; propodeal dorsum 0; lateral marsin of propodeal declivity 1 - 2, just above the spiracle. Gastral tergites 1 - 4 each with stout setae present, the longest of them usually longer than the maximum diameter of the eye. Sculpture on the head weak and superficial. Colour uniform light brown, dark brown, blackish brown or black; colour appears consistent within nest series but varies between series. Middle and hind tarsi the same colour as the body or a little lighter.

Type Material

Bolton (2007) - Syntype workers, Ethiopia: “West Abessinien” no loc. (Ilg) (Musee d'Histoire Naturelle Genève) [examined].

References

  • Bolton, B. 2007b. 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. 1910c. Ameisen aus der Kolonie Erythräa. Gesammelt von Prof. Dr. K. Escherich (nebst einigen in West-Abessinien von Herrn A. Ilg gesammelten Ameisen). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 29: 243-274 (page 264, worker, male described)
  • Shattuck, S. O. 1992c. Generic revision of the ant subfamily Dolichoderinae (Hymenoptera: Formicidae). Sociobiology 21: 1-181 (page 160, Combination in Technomyrmex)

References based on Global Ant Biodiversity Informatics

  • Baroni Urbani C. 1977. Katalog der Typen von Formicidae (Hymenoptera) der Sammlung des Naturhistorischen Museums Basel (2. Teil). Mitt. Entomol. Ges. Basel (n.s.) 27: 61-102.
  • 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.
  • Emery C. 1913. Hymenoptera. Fam. Formicidae. Subfam. Dolichoderinae. Genera Insectorum 137: 1-50.
  • Forel A. 1910. Ameisen aus der Kolonie Erythräa. Gesammelt von Prof. Dr. K. Escherich (nebst einigen in West-Abessinien von Herrn A. Ilg gesammelten Ameisen). Zoologische Jahrbücher. Abteilung für Systematik, Geographie und Biologie der Tiere 29: 243-274.
  • Hita Garcia F., E. Wiesel, G. Fischer. 2013. The ants of Kenya (Hymenoptera: Formicidae)—faunal overview, first species checklist, bibliography, accounts for all genera, and discussion on taxonomy and zoogeography. Journal of East African Natural History 101: 127-222.
  • Hita Garcia, F., G. Fischer, M.K. Peters, R.R. Snelling and H.W. Wagele. 2009. A preliminary checklist of the ants (Hymenoptera: Formicidae) of Kakamega Forest (Kenya). Journal of East African Natural HIstory 98(2): 147-165.
  • IZIKO South Africa Museum Collection
  • 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. 1922. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. II. The ants collected by the American Museum Congo Expedition. Bulletin of the American Museum of Natural History 45: 39-269.
  • Wheeler W. M. 1922. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VIII. A synonymic list of the ants of the Ethiopian region. Bulletin of the American Museum of Natural History 45: 711-1004