Technomyrmex innocens

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Technomyrmex innocens
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Technomyrmex
Species: T. innocens
Binomial name
Technomyrmex innocens
Fisher & Bolton, 2007

Technomyrmex innocens casent0443365 profile 1.jpg

Technomyrmex innocens casent0443365 dorsal 1.jpg

Specimen labels

Most of the material examined was obtained by beating low vegetation but some was collected from litter, some from rotten wood and some from rotten sticks on the forest floor. Worker-queen intercastes are known, as are alate queens. (Bolton 2007)

Identification

Bolton (2007) - A member of the T. pallipes complex in the Technomyrmex albipes group. There are three small, yellow to light brownish yellow Malagasy Technomyrmex species that have setae present on the dorsal head behind the level of the posterior margin of the eye. Of these Technomyrmex madecassus is overall the most densely setose and has very distinct setal pits. It also has the metathoracic spiracles abutting, or very close to, the metanotal groove in dorsal view, has 2 - 4 pairs of mesonotal setae and has 2 - 3 pairs of setae present on the lateral margins of the propodeal declivity. Even in abraded specimens tne pits of these setae remain very conspicuous. In contrast innocens has much less distinct setal pits, has the metathoracic spiracles relatively widely separated from the metanotal groove in dorsal view and has only a single, very short pair of mesonotal setae; like madecassus it has setae present (a single short pair) on the propodeal declivity. Like innocens, Technomyrmex fisheri has its metathoracic spiracles some distance from the metanotat groove, but fisheri is characterised by its lack of setae (and setal pits) on the mesonotum and propodeal declivity.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality), Mayotte.


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Male

Nomenclature

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

  • innocens. Technomyrmex innocens Fisher & Bolton, in Bolton, 2007a: 52, fig. 27 (w. w-q intercaste) MADAGASCAR.

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 2.8, HL 0.65, HW 0.60, SL 0.62, PW 0.40, WL 0.86. Indices: CI 92, SI 103, OI 25, EP1 63, DTI 137.

Frontal carina with 2 setae: in profile the posterior of these located at about the level of the anterior margin of the eye and the longest on the dorsum. Dorsum of head posterior to this with a pair of shorter setae at about the level of the posterior margin of the eye and with three pairs posterior to this; the longest of these three pairs about two-thirds the distance to the posterior margin of the head and the posteriormost pair just in front of the posterior margin (cephalic setae are somewhat variable, see comments below). Setal pits visible as darker pinpoints on paler cuticle. Anterior clypeal margin with a small, shallow median impression. With head in full-face view the sides shallowly convex and the posterior margin with a shallow median concavity. Eyes located well in front of midlength, EPI 63; outer margin of eye almost touches the outline of the side in full-face view. Number of setal pairs on mesosoma: pronotum 2; mesonotum 1, very short and located on the posterior one-third; propodeal dorsum 0; lateral margins of propodeal declivity 1, very short and located above the spiracle. In dorsal view the metathoracic spiracles are widely separated from the metanotal groove, not abutting it (distance separating them is at least equal to the diameter of the metathoracic spiracle). Dorsum of mesonotum evenly curved in profile. Dorsum of propodeum meets the declivity in a blunt angle; length of dorsum less than depth of declivity to spiracle. Gastral tergites 1 - 4 each with setae distributed everywhere on the sclerites; maximum length of setae on first gastral tergite is distinctly less than the maximum diameter of the eye. Head, mesosoma, petiole and gaster yellow, dorsum of head and gaster weakly brownish yellow; legs yellow throughout.

Other worker. TL 2.3 - 3.1, HL 0.55 - 0.71, HW 0.51 - 0.64, SL 0.52 0.64, PW 0.32 - 0.43, WL 0.68 0.95 (15 measured). Indices: CI 88 - 94, SI 96 - 110, 01 25 - 28, EPI 60 - 70, DT1 133 143.

Setae on head behind clypeus somewhat variable in number and position. Two, three (the usual number) or four pairs may be present on the dorsum behind the level of the posterior margin of the eye. Where only two pairs are present behind the level of the posterior margin of the eye there is a short pair above the eye; apparently this and the following pair of setae have shifted slightly anteriorly from the position seen in the holotype, as both have the same number of setae present. Where four pairs are present there is an additional pair behind the level of the posterior margin of the eye. The pronotum may have 3 pairs of setae. Where setae have been abraded off small pits, that are darker in colour than the surrounding cuticle, are usually visible. Colour varies from yellow to light brown throughout.

Type Material

Holotype worker, Madagascar: Provo Mahajanga, P.N. Namoroka, 17.8 km. 3290 WNW Vilanandro, 100 m., 16°22.6'S, 45°16.6'E, 8-12.xi.2002, CASENT 0485542, BLF 6510(11), beating low vegetation, tropical dry forest (Fisher et at.) (California Academy of Sciences).

Paratypes. 3 workers with same data as holotype but CASENT 0022497, BLF 6506(17), sifted litter; CASENT 0022500, BLF 6506(19); CASENT 0485538, BLF 6510(9). 2 workers + 1 intercaste, same locality but 9.8 km. 3000 WNW Vilanandro, 140 m., 16°28.0'S, 45°21.0'E, 4-8.xi.2002, CA5ENT 0474760 and CASENT 0474761, BLF 6448(13) (Fisher et al.) (CASC).

References

  • 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.