Strumigenys asrochia

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

The type material was collected from lowland forest litter samples.

Identification

Bolton (2000) - A member of the godeffroyi complex in the Strumigenys godeffroyi-group. See notes under Strumigenys confusatrix

Keys including this Species

Key to Strumigenys of East Asia

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia (type locality), Sulawesi.

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Explore Overview of Strumigenys 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.

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Castes

Nomenclature

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

asrochia. Strumigenys asrochia Bolton, 2000: 787, figs. 431, 493 (w.q.) INDONESIA (Sulawesi).

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 0.44, CI 65, ML 0.33, MI 49, SL 0.42, SI 95, PW 0.27, AL 0.66. Characters of godeffroyi-complex. Cephalic dorsum with pair of erect hairs closest to midline on occipital margin minutely looped apically or with the extreme apex abruptly angled anteriorly (apices broken off in many paratypes so that hairs appear straight). With head in full-face view the dorsolateral margin posterior to the apicoscrobal flagellate hair has a row of 3-4 stiffly projecting hairs. These hairs contrast with the marginal hairs anterior to the flagellate hair as they are more cylindrical (i.e. not spatulate), more elevated and less strongly curved anteriorly. Ground-pilosity on pronotal dorsum sparse and inconspicuous. Dorsum of pronotum with a pair of erect long flagellate hairs as well as the humeral pair. Entire side of alitrunk densely reticulate-punctate, usually without smooth patches anywhere but in some paratypes a small median patch on katepisternum more or less smooth. Propodeal declivity with a broad conspicuous lamella. Propodeal teeth strongly developed at dorsal apex of lamella and dorsal surface of tooth in profile not surmounted by a convex crest or ridge of spongiform tissue. Disc of postpetiole densely reticulate-punctate. Basigastral costulae conspicuous but not extending half the length of the tergite.

Paratypes. TL 2.5, HL 0.68-0.69, HW 0.44-0.49, CI 64-67, ML 0.31-0.34, MI 47-50, SL 0.40-0.42, SI 89-95, PW 0.27-0.28, AL 0.66-0.70 (10 measured).

Type Material

Holotype worker, Indonesia: Sulawesi Utara, Dumoga-Bone N. P., 200-400 m., ii.1985, 2m2 sample of litter, lowland forest, BB2 (P.M. Hammond) (The Natural History Museum).

Paratypes. 8 workers and 1 queen with same data as holotype; 3 workers with same data but BB1, 3 workers with same data but BB3; 9 workers with same data but BB7 (BMNH, Museum of Comparative Zoology, Musee d'Histoire Naturelle Genève).

References

Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 787, worker described)

References based on Global Ant Biodiversity Informatics

Bolton B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute 65: 1-1028.