Strumigenys perdita

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

This species occurs in lowland wet forest, in leaf litter on the forest floor (Longino, Ants of Costa Rica).

Identification

A member of the Strumigenys silvestrii-group.

Bolton (2000) - S. perdita is closely related to three other Central American species, Strumigenys nastata, Strumigenys calamita and Strumigenys timicala; see notes under the first two of these.

Longino (Ants of Costa Rica) - Mandible somewhat bowed; apical fork of mandible without intercalary tooth; mandible with long, spiniform preapical tooth about one quarter distance from apical fork to mandible base; minute denticle variably present one half to two thirds distance to mandible base; eyes composed of 1-4 facets; gaster smooth with strong basal costulae; gaster with erect setae filiform to weakly thickened; leading edge of scape at the subbasal bend lacks a lamella; spiniform preapical tooth of mandible occurs closer to the apicodorsal tooth than to the proximal denticle.

This species is extremely similar to Strumigenys calamita, differing primarily in the filiform (perdita) rather than spatulate (calamita) setae on the gaster, and to Strumigenys nastata, differing in the lack of a lamella on the scape, and the preapical tooth character described above.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Costa Rica (type locality), Honduras.

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.

  • perdita. Strumigenys perdita Bolton, 2000: 556, figs. 327, 349 (w.) COSTA RICA.

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) - Holotype. TL 1.9, HL 0.48, HW 0.36, CI 75, ML 0.28, MI 58, SL 0.30, SI 83, PW 0.23, AL 0.48. Preapical tooth of mandible separated from apicodorsal by a distance about equal to its length; a small preapical denticle also present, just proximal of mandibular midlength. The spiniform preapical tooth is closer to the apicodorsal tooth than it is to the proximal denticle. Subbasal bend of scape shallow; basally curved hairs on leading edge spoon-shaped and quite short, no longer than maximum width of scape. With head in full-face view hairs fringing upper scrobe margins, and cephalic ground-pilosity, spoon-shaped. Cephalic dorsum with two pairs of simple erect hairs, one close to highest point of vertex, the other near the occipital margin. Apicoscrobal hair flagellate, long and very conspicuous; pronotal humeral hair flagellate; an erect pair of flagellate hairs on mesonotum. Standing hairs on petiole, postpetiole and first gastral tergite all simple and erect, stiff and stout, straight or at most only extremely shallowly curved. Some of these hairs bluntly pointed apically, others narrowly rounded and blunt. Propodeal teeth subtended by lamellae that extend down declivity; basally the lamellae not angulate or dentiform. With petiole in profile the ventral surface with spongiform tissue present and the lateral lobe of the node distinct and spongiform. Disc of postpetiole smooth; basigastral costulae at least equal in length to postpetiole disc.

Paratypes. TL 1.9-2.2, HL 0.48-0.52, HW 0.37-0.41, CI 75-79, ML 0.28-0.32, MI 58-61, SL 0.30-0.34, SI 82-84, PW 0.24-0.27, AL 0.50-0.56 (4 measured).

Type Material

Bolton (2000) - Holotype worker, Costa Rica: Heredia, Est. Biol. La Selva, 50-150 m., 10°26'N, 84°01'W, 3.i.1994, INBio-OET, bosque secondario, B/20/357 (no collector's name) (The Natural History Museum).

Paratypes. 2 workers with same data as holotype but 1.ii.1994, B/04/3 80, bosque primario; 1 worker with same data but 1.ii.1994, B/03/379, bosque primario; 1 worker with same data but 1.vii.1993, B/01/138, parcelas sucesionales (BMNH, Instituto Nacional de Biodiversidad, Museum of Comparative Zoology).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Mem. Am. Entomol. Inst. 65: 1-1028 (page 556, worker described)