Strumigenys nummula

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

Strumigenys nummula casent0900925 p 1 high.jpg

Strumigenys nummula casent0900925 d 1 high.jpg

Specimen Labels

Known from both litter and fogging samples in rainforest.

Identification

Bolton (2000) - A member of the emdeni complex in the Strumigenys horvathi-group. This is the only species of the emdeni-complex to possess a pronotal humeral hair and to have a series of 3 pairs of stiffly erect hairs on the mesonotal dorsum.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Australasian Region: Australia (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.

  • nummula. Strumigenys nummula Bolton, 2000: 976, fig. 531 (w.) AUSTRALIA.

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 2.5, HL 0.68, HW 0.53, CI 78, ML 0.23, MI 34, SL 0.31, SI 58, PW 0.29, AL 0.68. Characters of emdeni-complex. Inner margin of mandible with a narrow translucent cuticular crest. Outer curvature of eyes just visible in full-face view, upper scrobe margins approximately straight. With head in profile the scrobe strongly developed behind the level of the eye, deep, clearly defined and with sharp dorsal, ventral and posterior margins. Cephalic dorsum densely clothed with very conspicuous spoon-shaped to scale-like ground-pilosity but this pilosity not reproduced on promesonotal dorsum where it consists of scattered small spatulate hairs, the overall appearance of the ground-pilosity is much less dense and much weaker than on the cephalic dorsum. One or two very short erect hairs present on occipital margin at each side, near apices of occipital lobes. Pronotal dorsum without standing hairs but humerus with a short straight hair that is directed laterally. Mesonotum with 3 pairs of short erect hairs, the posterior pair the longest. First gastral tergite with numerous erect stiff hairs, some of them slightly thickened or flattened apically, or weakly remiform. Dorsum of head and alitrunk uniformly reticulate-punctate. Side of alitrunk with katepisternum smooth, and a smooth patch present that covers the upper metapleuron and lower side of the propodeum. Disc of postpetiole smooth and shining.

Paratypes. TL 2.4-2.6, HL 0.70-0.71, HW 0.56-0.58, CI 80-82, ML 0.24, MI 33-34, SL 0.32-0.33, SI 57, PW 0.31-0.32, AL 0.68 (2 measured).

Type Material

Holotype worker, Australia: North Queensland, Lamb Range, 19 km. SE Mareeba, 3.xii.1988, 1200 m, pyrethrum/logs & trees (Monteith & Thompson) (Australian National Insect Collection). Paratypes. 1 worker, Australia: North Queensland, Mt Fisher, 7 km. SW Millaa Millaa (Whiteing Ridge), 5.v.1983, QM Berlesate No. 585, 17. 34S, 145.34E, 1200 m, rainforest, sieved litter (G. B. Monteith & D. K. Yeates); 1 worker, North East Queensland, Upper Boulder Creek via Tully, 27.x.1983, QM Berlesate No. 618, 17.50S, 145.54E, 900 m, rainforest, sieved litter (Monteith, Yeates & Thompson) (ANIC, The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 976, fig. 531 worker described)