Strumigenys wilsoni

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Strumigenys wilsoni
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. wilsoni
Binomial name
Strumigenys wilsoni
Brown, 1969

Strumigenys wilsoni casent0280754 p 1 high.jpg

Strumigenys wilsoni casent0280754 d 1 high.jpg

Specimen Labels

The small number of collections of this species have been taken from rainforest litter samples.

Identification

Bolton (2000) - A member of the ebbae complex in the Strumigenys koningsbergeri-group. Isolated within the group by its complete lack of spongiform tissue on the petiole. This character, coupled with the lack of humeral hairs, long scape and extensive basigastral costulae, immediately diagnoses wilsoni. In fact the scape, at SI 82, is the longest yet recorded in the koningsbergeri-group; all other species together have the range of SI 53-75.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Strumigenys were once thought to be rare. The development and increased use of litter sampling methods has led to the discovery of a tremendous diversity of species. Many species are specialized predators (e.g. see Strumigenys membranifera and Strumigenys louisianae). Collembola (springtails) and other tiny soil arthropods are typically favored prey. Species with long linear mandibles employ trap-jaws to sieze their stalked prey (see Dacetine trap-jaws). Larvae feed directly on insect prey brought to them by workers. Trophallaxis is rarely practiced. Most species live in the soil, leaf litter, decaying wood or opportunistically move into inhabitable cavities on or under the soil. Colonies are small, typically less than 100 individuals but in some species many hundreds. Moist warm habitats and micro-habitats are preferred. A few better known tramp and otherwise widely ranging species tolerate drier conditions. Foraging is often in the leaf litter and humus. Workers of many species rarely venture above ground or into exposed, open areas. Individuals are typically small, slow moving and cryptic in coloration. When disturbed individuals freeze and remain motionless. Males are not known for a large majority of species.

Castes

Nomenclature

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

  • wilsoni. Strumigenys wilsoni Brown, 1969b: 28, figs. (w.) NEW GUINEA. See also: Bolton, 2000: 856.

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

Description

Worker

Bolton (2000) - TL 2.4, HL 0.63, HW 0.44, CI 70, ML 0.26, MI 41, SL 0.36, SI 82, PW 0.28, AL 0.64. With characters of ebbae-complex. Preapical tooth conical, shorter than width of andible at point where it arises. Inner margin of mandible proximal of preapical tooth with a narrow lamella that terminates just proximal of preapical tooth; lamella tapers toward base of mandible. Outer margin of mandible more or less straight from basal inflection to level of preapical tooth. Ventrolateral margin of head without a preocular concavity. Upper scrobe margins divergent from frontal lobes posteriorly but not expanded laterally; entire eye exposed and easily visible in full-face view. Apicoscrobal hair absent. Dorsum of head in profile with short simple stubbly ground-pilosity that is elevated rather than reclinate; erect hairs absent except for a transverse row of 6 along occipital margin, these hairs only slightly longer and stouter than the ground-pilosity. Pronotal humeral hair absent, pronotal dorsum with 2 pairs of short erect hairs, mesonotum with a single similar pair. Katepisternum, metapleuron and side of propodeum entirely reticulate-punctate. Lamella on propodeal declivity very narrow, its posterior (free) margin shallowly concave. Petiole in profile without trace of spongiform tissue either ventrally or laterally; ventral lobe of postpetiole well developed. Petiole node in dorsal view slightly longer than broad. Disc of postpetiole reticulate-punctate. Standing hairs on first gastral tergite mostly flattened or broadened at apex. Basigastral costulae fine and sharply defined, extending about half the length of the tergite, much longer than disc of postpetiole.

Type Material

Bolton (2000) - Holotype worker, PAPUA NEW GUINEA: Bisianumu, nr Sogeri, 15-20.iii.1955, rain forest litter (E. O. Wilson) (Museum of Comparative Zoology) [examined].

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 856, redescription of worker)
  • Brown, W. L., Jr. 1969c. Strumigenys wilsoni species nov. Pilot Regist. Zool. Card No. 28. (page 28, fig. 2 worker described)