Strumigenys orthanetes

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

Strumigenys orthanetes casent0900913 p 1 high.jpg

Strumigenys orthanetes casent0900913 d 1 high.jpg

Specimen Labels

The type specimens were found in a rotten log in a rainforest.

Identification

Bolton (2000) - A member of the Strumigenys mayri-group. The presence of a preapical denticle on the mandible and a pair of erect hairs on the pronotal dorsum (as well as the humeral pair) will also separate orthanetes from Strumigenys paranetes and Strumigenys dysanetes, where both are absent. Also, orthanetes has much longer mandibles and scapes than dysanetes (compare measurements) and appears always to be lighter in colour than paranetes as the latter is uniformly dark brown to blackish brown. The mandibular index in orthanetes averages higher (MI 47-51) than in anetes and paranetes (combined MI 44-47).

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.

  • orthanetes. Strumigenys orthanetes Bolton, 2000: 980, figs. 533, 548 (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 2.9, HL 0.80, HW 0.53, CI 66, ML 0.38, MI 48, SL 0.52, SI 99, PW 0.30, AL 0.75. Answering the description of anetes but differing as follows. Mandible with a minute denticle close to the apicodorsal tooth. Pronotal dorsum with a pair of standing hairs located posterior to the humeral pair. Lamella on propodeal declivity broad, its posterior (free) margin convex. Head and alitrunk dull brownish yellow, gaster somewhat darker.

Paratypes. TL 2.8-2.9, HL 0.77-0.80, HW 0.51-0.53, CI 66-68, ML 0.38-0.40, MI 48-51, SL 0.49-0.54, SI 96-104, PW 0.29-0.30, AL 0.73-0.75 (5 measured).

Dimensions of non-paratypic workers. TL 2.5-2.7, HL 0.72-0.78, HW 0.48-0.53, CI 67-70, ML 0.34-0.39, MI 47-50, SL 0.45-0.52, SI 90-98, PW 0.27-0.29, AL 0.66-0.70 (15 measured).

Type Material

Holotype worker, Australia: Qld, Mt Haig, 1150 m., 17.06S, 145.36E, 29.x.1976, ex rotten log, rainforest, accession no. 76.287, ANIC ants vial 37.224 (R. W. Taylor & T. A. Weir) (Australian National Insect Collection). Paratypes. 8 workers with same data as holotype (ANIC, The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 980, figs. 533, 548 worker described)