Strumigenys stygia

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Strumigenys stygia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. stygia
Binomial name
Strumigenys stygia
Santschi, 1913

Strumigenys stygia casent0280728 p 1 high.jpg

Strumigenys stygia casent0280728 d 1 high.jpg

Specimen Labels

Known from two collections, neither of which included any biological details.

Identification

A member of the arnoldi complex in the Strumigenys arnoldi-group.

Bolton (1983) - S. stygia is similar to Strumigenys arnoldi, Strumigenys traegaordhi, Strumigenys mesahyla and Strumigenys nimbrata. These four are separated from stygia as arnoldi lacks pronotal flagellate hairs, nimbrata has funicular segments 2 and 3 vestigial, and both mesahyla and traegaordhi do not have the postpetiole sculptured.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Angola, Cameroun, Kenya (type locality), Zimbabwe.


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.

  • stygia. Strumigenys (Strumigenys) stygia Santschi, 1913b: 257 (diagnosis in key) (w.) KENYA. Santschi, 1914b: 113 (w.). See also: Brown, 1954k: 29; Bolton, 1983: 394; Bolton, 2000: 596.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Bolton (1983) - TL 1.9-2.1, HL 0.50-0.53, HW 0.40-0.43, CI 80-84, ML 0.18-0.21, MI 36-40, SL 0.26-0.28, SI 63-68, PW 0.24-0.25, AL 0.48-0.52 (7 measured).

Apical fork of each mandible with 2 teeth, without intercalary teeth or denticles. Each mandibular blade with 2 pre apical teeth, the proximal longer than the distal in each case. Upper scrobe margins convex, the eyes not visible in full-face view. Eyes small, the maximum diameter distinctly less than the maximum width of the scape. Preocular notch absent, ventral surface of head without a transverse preocular groove or impression. Antennal scapes curved in the basal third, the median third expanded and somewhat flattened, the convex leading edges of the scapes with a row of apically curved short broadly spoon-shaped hairs. Ground-pilosity of head relatively broad spoon-shaped hairs which are curved anteriorly and appear stud-like or scale-like in full-face view, the hairs on the dorsum anterior to the highest point of the vertex somewhat larger and more conspicuous than those posterior to this point. Hairs fringing the upper scrobe margins the same shape as those on the dorsum. Cephalic dorsum reticulate-punctate. Pronotal humeri each with a single fine flagellate hair. Mesonotum with a single pair of clavate standing hairs. Ground pilosity of dorsal alitrunk of sparse spoon-shaped to scale-like small hairs. Mesonotum depressed behind the level of the pair of hairs. Metanotal groove represented on the dorsum by a faint line. Sides of pronotum superficially reticulate or granular, pleurae and propodeum laterally smooth except for some weak patches of punctate sculpture peripherally. Pronotal dorsum densely punctate, usually with overlying weak longitudinal rugulae. Remainder of dorsal alitrunk reticulate-punctate. Dorsum of petiole node reticulate-punctate, postpetiole superficially granular to reticulate-punctate. Ventral spongiform strip of petiole narrow and inconspicuous. Ventral spongiform lobe of postpetiole equal to or slightly less than the exposed area of the postpetiole. Basigastral costulae conspicuous. Dorsal surfaces of petiole, postpetiole and gaster with stout standing hairs which are thickened or clavate apically. Colour light brown to medium brown.

Type Material

Bolton (1983) - Syntype workers, KENYA: Cave A at Shimoni, st. no. 9, xi.1911 (Alluaud &feannel) (Naturhistorisches Museum, Basel) [examined].

References

  • Bolton, B. 1983. The Afrotropical dacetine ants (Formicidae). Bulletin of the British Museum (Natural History). Entomology. 46:267-416. PDF (page 394, redescription of worker)
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 596, redescription of worker)
  • Brown, W. L., Jr. 1954k. The ant genus Strumigenys Fred. Smith in the Ethiopian and Malagasy regions. Bull. Mus. Comp. Zool. 112: 1-34 (page 29, redescription of worker)
  • Santschi, F. 1913b. Clé analytique des fourmis africaines du genre Strumigenys Sm. (Hym.). Bull. Soc. Entomol. Fr. 1913: 257-259 (page 257, worker described)
  • Santschi, F. 1914b. Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale, 1911-1912. Résultats scientifiques. Insectes Hyménoptères. II. Formicidae. Paris: Libr. A. Schulz, pp. 41-148. (page 113, description of worker)