Strumigenys pharosa

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

Strumigenys pharosa casent0280731 p 1 high.jpg

Strumigenys pharosa casent0280731 d 1 high.jpg

Specimen Labels

Known from two collections, the non-type was collected in rainforest.

Identification

Bolton (2000) - A member of the Strumigenys eurycera-group. The holotype was found in the TM collection of Biro material, confused with series of Strumigenys mocsaryi. Like Strumigenys eurycera, pharosa lacks pronotal humeral hairs, but unlike that species does not have a massively expanded lobe on the leading edge of the scape. Other species of the group (Strumigenys quattuor, Strumigenys tetra) have a distinct pronotal humeral hair.

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.

  • pharosa. Strumigenys pharosa Bolton, 2000: 780 (w.) NEW GUINEA.

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 2.2, HL 0.58, HW 0.47, CI 81, ML 0.24, MI 41, SL 0.30, SI 64, PW 0.28, AL 0.62. The slender preapical tooth is sub tended by a very narrow translucent cuticular lamella, the height of which is distinctly less than one-third the length of the preapical tooth; lamella commences close to base of preapical tooth and peters out proximally before reaching the anterior clypeal margin. Dorsolateral margin of head without freely laterally projecting hairs though 1-2 very short stubbly hairs may be present close to apex of scrobe. Scape relatively slender, about 5 times longer than maximum width and with leading edge shallowly convex. All hairs on leading edge of scape directed toward apex of scape. Apical segment of antenna spindle-shaped, strongly constricted basally. Cephalic dorsum lacking erect hairs though a few minute hairs of the ground-pilosity may be somewhat elevated. Pronotal humeri and dorsal alitrunk without standing hairs; postpetiole and first gastral tergite with simple short hairs that are suberect to erect. Entire alitrunk reticulate-punctate except for mesopleuron which is mostly smooth. Longitudinal costulae at base of first gastral sternite coarse and conspicuous.

Type Material

Holotype worker, Papua New Guinea: Madang (Friedrich Wlh.-hafen on label), 901 (Biro) (Hungarian Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Mem. Am. Entomol. Inst. 65: 1-1028 (page 780, worker described)