Strumigenys ortholex

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

Strumigenys ortholex casent0900836 p 1 high.jpg

Strumigenys ortholex casent0900836 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys ortholex.

Identification

Bolton (2000) - A member of the signeae complex in the Strumigenys godeffroyi-group. This species shares a marked reduction of standing pilosity and lack of a specialized humeral hair with Strumigenys forficata, Strumigenys degonya and Strumigenys esrossi; see under forficata.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: New Guinea.


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.

  • ortholex. Strumigenys ortholex Bolton, 2000: 825 (w.) NEW GUINEA.

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 2.2, HL 0.60, HW 0.41, CI 68, ML 0.28, MI 47, SL 0.38, SI 93, PW 0.24, AL 0.57. Characters of signeae-complex. Preapical tooth not adjacent to apicodorsal tooth, space between their bases about equal to length of preapical tooth. Apicoscrobal hair absent; dorsolateral margin of head in full-face view with a row of small, closely applied spatulate hairs, without freely laterally projecting hairs anywhere. Ventrolateral margin of head not concave in front of eye. Cephalic dorsum with strongly curved subreclinate spatulate ground-pilosity but without erect hairs, even the usual erect row near the occipital margin absent. Dorsal alitrunk with sparse, near-appressed ground pilosity, without standing hairs anywhere, without pronotal humeral hair. Dorsal surface of petiole without standing hairs but disc of postpetiole and first gastral tergite with sparse erect flagellate hairs: postpetiole disc with one pair, first gastral tergite with two pairs, one near base the other near apex. Second tergite with flagellate hairs. Entire dorsum and side of alitrunk finely densely reticulate-punctate. Propodeal lamella narrow, its posterior (free) margin concave and paralleling the shape of the edge of the declivity. With petiole in profile the lateral spongiform lobe is restricted to the extreme posterior margin of the node; in the same view anterior face of node subequal to length of dorsum. Petiole node in dorsal view slightly broader than long. Disc of postpetiole finely longitudinally costulate. Basigastral costulae sharply developed, longer than disc of postpetiole; spaces between costulae shining, not shagreenate.

Paratypes. TL 2.1-2.2, HL 0.60-0.63, HW 0.41-0.43, CI 68-71, ML 0.28-0.29, MI 46-48, SL 0.37-0.38, SI 87-93, PW 0.24-0.26, AL 0.57-0.61 (4 measured).

Type Material

Holotype worker, Papua New Guinea: N. Dist., Popondetta, 6.ix.1972, P. M Room coll. sp. 422 (P. M. Room) (Australian National Insect Collection).

Paratypes. 4 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 825, worker described)