Strumigenys akalles

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

Strumigenys akalles casent0900778 p 1 high.jpg

Strumigenys akalles casent0900778 d 1 high.jpg

Specimen Labels

The type material was collected from a soil pocket on rock.

Identification

Bolton (2000) - A member of the Strumigenys akalles-group. The three species in this small and compact group are easily separated by characters of sculpture and pilosity, as noted in the key. In brief, Strumigenys eidechthes is densely clothed in very long soft flagellate hairs and has the clypeus smooth. Strumigenys inhonesta also has soft pilosity but it is much shorter and less dense, and the clypeus is sculptured. S. akalles stands in contrast to both of these as its pilosity is stiff, with most hairs on the head and alitrunk minutely bifid or splayed out apically.

There is a morphoclinal reduction in mandible length through the group. As the mandibles shorten they become stouter and the preapical tooth larger. In terms of reducing MI the morphocline runs: inhonesta (MI 25-28), aka lies (MI 23), eidechthes (MI 18-20).

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


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.

  • akalles. Strumigenys akalles Bolton, 2000: 748 (w.) BORNEO.

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 2.3, HL 0.62, HW 0.52, CI 84, ML 0.14, MI 23, SL 0.32, SI 62, PW 0.28, AL 0.60. In full-face view with mandibles fully closed the length of the left preapical tooth is distinctly less than the distance between the base of the tooth and the base of the mandible. Leading edge of scape with stiff projecting hairs that are longer than the maximum width of the scape. Dorsolateral margin of head with the numerous freely laterally projecting hairs minutely bifid or weakly splayed apically; these hairs stiff and shallowly curved rather than fine and flexuous, the longest of them much shorter than the length of the scape. Erect hairs on cephalic dorsum and promesonotum bifid or splayed apically. Clypeus weakly sculptured, not as strongly so as cephalic dorsum but by no means glassy smooth. Pronotal dorsum mostly smooth, with widely scattered punctures; mesonotum more densely punctate than pronotum.

Type Material

Holotype worker, Malaysia: Sarawak, 4th Div., G. Mulu Nat. Pk, RGS Expd., Long Pala, 30.ix.1977, soil pocket on rock (B. Bolton) (The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 748, worker described)