Strumigenys lyroessa

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Strumigenys lyroessa
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. lyroessa
Binomial name
Strumigenys lyroessa
(Roger, 1862)

Strumigenys lyroessa casent0280737 p 1 high.jpg

Strumigenys lyroessa casent0280737 d 1 high.jpg

Specimen Labels

Known from rainforest and rubber plantations, with all specimens obtained from litter samples.

Identification

Bolton (2000) - A member of the lyroessa complex in the Strumigenys lyroessa-group. Three species within the lyroessa-complex lack a pronotal humeral hair and lack standing hairs on the dorsolateral margins of the mesonotum (Strumigenys aechme, lyroessa, Strumigenys tantilla). S. aechme separates from the other two by its lack of an apicoscrobal hair and its distinctive gastral pilosity. S. lyroessa is smaller than tantilla (compare measurements) and has remiform rather than spatulate hairs on the first gastral tergite.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Oriental Region: Bhutan, India, Sri Lanka (type locality).
Palaearctic Region: China.

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Check specimen 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.

  • lyroessa. Labidogenys lyroessa Roger, 1862a: 251, pl. 1, fig. 17 (w.) SRI LANKA. Combination in Strumigenys: Roger, 1863b: 40; in Labidogenys: Brown, 1948e: 103; in Strumigenys: Bolton, 1995b: 397. See also: Bolton, 2000: 872.

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 2.0-2.1, HL 0.47, HW 0.80, CI 80, ML 0.16-0.18, MI 27-32, SL 0.24, SI 51, PW 0.28-0.30, AL 0.54-0.55 (2 measured). Characters of lyroessa-complex. Upper scrobe margin and leading edge of scape with small curved spoon-shaped hairs; those on the former smaller than those on the latter. Apicoscrobal hair short and stiff, slightly thickened apically; posterior to this the dorsolateral margin without projecting hairs. Cephalic dorsum without standing hairs except for one or two very short hairs at apex of occipital lobe. Pronotal humeral hair absent and dorsal alitrunk entirely lacking standing hairs. Posterior half of first gastral tergite with a few stiff hairs that are feebly remiform. Surface of first gastral tergite otherwise with inconspicuous, widely scattered minute appressed pubescence.

Type Material

Bolton (2000) - Holotype worker, SRI LANKA (no type-material known to exist).

References