Technomyrmex nigriventris

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

Technomyrmex nigriventris casent0178279 profile 1.jpg

Technomyrmex nigriventris casent0178279 dorsal 1.jpg

Specimen labels

This small species forages mainly in the leaf litter and topsoil, but may also ascend low vegetation. In Nigeria it has been found nesting under a flake of bark near the base of a living tree, but presumably it also nests in rotten wood in the topsoil as it occurs in leaf litter samples. A very few intercastes between worker and queen castes are known but do not appear to be developed as frequently as in Technomyrmex moerens, Technomyrmex pallipes or others of the group. (Bolton 2007)

Identification

Bolton (2007) - A member of the T. albipes complex in the Technomyrmex albipes group. Related to Technomyrmex albipes and its immediate allies but is distinguished by its colour pattern, distribution of setae on the head and small size, the first of these being the most obvious when compared to other Afrotropical congeners.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Cameroun, Central African Republic, Congo (type locality), Ghana, Guinea, Kenya, Nigeria, Uganda.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • nigriventris. Technomyrmex nigriventris Santschi, in Forel, 1910f: 22 (footnote) (w.) CONGO. See also: Bolton, 2007a: 30.

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 2.2 - 2.7, HL 0.52 - 0.62, HW 0.46 - 0.56, SL 0.46 - 0.58, PW 0.32 - 0.36, WL 0.72 - 0.84 (10 measured). Indices: CI 88 - 92, SI 100 - 108, OI 26 - 29, EPI 52 - 67, DTI 126 - 132.

Frontal carina with 2 setae: in profile the first above the torulus and the second at about the level of the midlength of the eye. Dorsum of head posterior to this entirely lacks setae. Anterior margin of clypeus with a small, shallow median indentation. Posterior margin of head in full-face view almost transverse, medially flattened or extremely shallowly concave. With head in full-face view the eyes located relatively anteriorly (EP1 < 70). their outer margins just fail to break, or just break, the outline of the sides. Mesosoma in profile with mesonotum evenly curve and metanotal groove impressed, Propodeal dorsum short, much shorter than depth of declivity to spiracle; dorsum meets declivity in a blunt angle. Number of setal pairs on mesosoma: pronotum 2, length about equal to maximum diameter of eye; mesonotum 1, shorter than pronotal setae; propodeal dorsum 0; lateral margin of propodeal declivity usually with 1. Gastral tergites 1 - 4 each with numerous setae, the longest on the first tergite about equal to the maximum diameter of the eye or slightly shorter. Head, mesosoma, petiole and legs yellow to brownish yellow, the head often darker than the mesosoma. Gaster dark brown, much darker than the mesosoma and petiole and strongly contrasting to them.

Type Material

Bolton (2007) - Syntype workers, Congo: Brazzaville (Weiss) (Naturhistorisches Museum, Basel) [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.
  • Santschi, F. 1910i. [Untitled. Technomyrmex nigriventris, n. sp.]. P. 22 in: Forel, A. Zoologische und anthropologische Ergebnisse einer Forschungsreise im westlichen und zentralen Südafrika ausgeführt in den Jahren 1903-1905 von Dr. Leonhard Schultze. (page 22, (footnote) worker described)