Strumigenys gnathosphax

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Strumigenys gnathosphax
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. gnathosphax
Binomial name
Strumigenys gnathosphax
Bolton, 2000

Strumigenys gnathosphax casent0102655 profile 1.jpg

Strumigenys gnathosphax casent0102655 dorsal 1.jpg

Specimen labels

Known from wet-forest litter samples.

Identification

Bolton (2000) - A member of the Strumigenys wallacei-group. This stocky, broad-headed species is unique in the group as it has two intercalary denticles and a scrobe that is well developed behind the level of the eye. Its scape is quite short, SI 56-59 as opposed to SI 67-85 in Strumigenys diasphax and Strumigenys wallacei together. S. gnathosphax also separates easily from diasphax as that species has numerous standing hairs on both head and promesonotum, and from wallacei as the latter has the side of the alitrunk and disc of the postpetiole reticulate-punctate, and its mesonotum bulges and has an almost vertical posterior declivity.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia, Malaysia (type locality).
Oriental Region: Thailand.


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.

  • gnathosphax. Strumigenys gnathosphax Bolton, 2000: 911, fig. 481 (w.) WEST MALAYSIA.

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 0.80, HW 0.75, CI 94, ML 0.40, MI 50, SL 0.44, SI 59, PW 0.36, AL 0.78. Apical fork of mandible with 2 intercalary denticles. Scrobe in profile conspicuous behind level of eye. Declivity of propodeum armed with a narrow spine dorsally and a projecting weakly spongiform lobe ventrally, the two connected by a weak carina. Ventral spongiform curtain of petiole at deepest distinctly greater than half the depth of the peduncle. Dorsal surface of head without standing hairs, with dense strongly curved spatulate ground-pilosity that is weakly or not elevated. Appressed anteriorly curved hairs that fringe upper scrobe margin minute, much smaller than hairs on leading edge of scape. Dorsolateral margin of head without projecting hairs. Pronotal humeral hair short, stout and clavate. Dorsum of pronotum with spatulate ground-pilosity as on head. Mesonotum with similar hairs but posteriorly they are more elevated and one or more posterior pairs are longer, more erect and more obviously clavate apically. Waist segments and first gastral tergite with stout stiff remiform to clavate hairs, those on gaster suberect to erect. Pleurae and side of propodeum mostly to entirely smooth; disc of postpetiole not reticulate-punctate.

Paratypes. TL 2.7-2.8, HL 0.73-0.80, HW 0.68-0.75, CI 93-96, ML 0.36-0.40, MI 47-50, SL 0.40-0.44, SI 56-59, PW 0.34-0.37, AL 0.72-0.78 (6 measured).

Type Material

Holotype worker, Malaysia: Cameron Highlands, 22.iii.1984 (Rougemont) (The Natural History Museum). Paratypes. 2 workers with same data as holotype; 10 workers, Malaysia: Pahang, Fraser’s Hill, 1380 m., Kuantun ridge, 17.iii.1993, #8 (Lobl & Calame) (BMNH, Musee d'Histoire Naturelle Genève, Museum of Comparative Zoology).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 911, fig. 481 worker described)