Strumigenys arrogantia

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

Strumigenys arrogantia casent0102632 profile 1.jpg

Strumigenys arrogantia casent0102632 dorsal 1.jpg

Specimen labels

The modest number of collections are all from rainforest and wet forest habitat, with all the specimens found in litter samples.

Identification

Bolton (2000) - A member of the lyroessa complex in the Strumigenys lyroessa-group. Seven species in the lyroessa-complex have a pronotal humeral hair present: Strumigenys hostilis, Strumigenys dryas, Strumigenys liophila, Strumigenys micrura, Strumigenys imantodes, Strumigenys sydorata and arrogantia. The first of these is the only species in the group to have the first gastral tergite entirely sculptured. The second, dryas, has very dense standing pilosity and the third has long scapes and femora and a relatively long narrow head. The remaining four species are very closely related and share a characteristic reduced pilosity and set of dimensions. Two, micrura and imantodes, have a very reduced lamella on the propodeal declivity whilst in arrogantia and sydorata the lamella is broad and conspicuous. These last two form a close pair of siblings separated by details of mandibular structure, as given in their respective descriptions.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


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

Worker

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • arrogantia. Strumigenys arrogantia Bolton, 2000: 868 (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 2.1, HL 0.64, HW 0.46, CI 72, ML 0.18, MI 28, SL 0.26, SI 57, PW 0.28, AL 0.60. Characters of lyroessa-complex. In profile preapical tooth of mandible about the same shape and size as the apicodorsal tooth. Dorsal margin of mandible, as seen in profile, not depressed distal of preapical tooth, the gap between preapical and apicodorsal teeth represented by a short transverse margin rather than a cleft. Upper scrobe margin with a row of anteriorly curved small spoon-shaped hairs. Apicoscrobal hair short, stiff and stout; dorsolateral margin of occipital lobe posterior to this with 5-6 similarly shaped but slightly shorter projecting hairs. Cephalic dorsum with standing hairs restricted to a stubbly transverse row along the occipital margin. Pronotal humeral hair short and stiff, pronotum otherwise without standing hairs. Mesonotum with 3 pairs of remiform to apically expanded short erect hairs, located along the dorsolateral margins. Width of lamella on propodeal declivity, at its broadest point below level of spiracle, more than half the length of the propodeal tooth. Erect hairs on first gastral tergite short and stiff, spatulate or expanded apically, distributed over the entire sclerite.

Paratypes. TL 2.1-2.2, HL 0.64-0.66, HW 0.49, CI 74-76, ML 0.18-0.20, MI 27-31, SL 0.26, SI 53-54, PW 0.28, AL 0.60 (2 measured).

Dimensions of non-paratypic workers. TL 2.0-2.2, HL 0.62-0.70, HW 0.47-0.51, CI 72-77, ML 0.18-0.22, MI 28-34, SL 0.24-0.29, SI 52-57, PW 0.28-0.31, AL 0.56-0.68 (10 measured).

Type Material

Holotype worker, Malaysia: Sarawak, Santubong, Kuching, v.1994 (Lobl & Burckhardt) (Musee d'Histoire Naturelle Genève). Paratypes. 5 workers with same data as holotype (MHNG, The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 868, worker described)

References based on Global Ant Biodiversity Informatics

  • Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
  • Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58