Strumigenys semicrypta

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

Strumigenys semicrypta casent0900626 p 1 high.jpg

Strumigenys semicrypta casent0900626 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Strumigenys semicrypta.

Identification

A member of the havilandi complex in the Strumigenys arnoldi-group.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Uganda (type locality).


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.

  • semicrypta. Strumigenys semicrypta Bolton, 2000: 596 (w.) UGANDA.

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 2.4, HL 0.62, HW 0.44, CI 71, ML 0.36, MI 58, SL 0.38, SI 86, PW 0.26, AL 0.60. Characters of havilandi-complex. Mandible broadest near midlength, distinctly narrowing toward apex but width not markedly diminishing from midlength to base. In profile mandible shallowly but distinctly arched. Mandible with both preapical teeth spiniform, the distal slightly longer than the proximal. Scape broadest at about the midlength, narrowing both proximally and distally. Cephalic ground-pilosity, the hairs bordering the upper scrobe margin, and the hairs on the leading edge of the scape, all large and broadly spoon-shaped. Middle and hind femora and tibiae densely clothed with appressed broadly spatulate hairs. Postpetiole small, not swollen nor inflated. Hairs on first gastral tergite stout, their apices much broadened and flattened so that in profile they appear broadly clavate.

Type Material

Holotype worker, Uganda: Maracha, v.1976, Sped. Ace. Lincei (no collector's name) (The Natural History Museum).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 596, worker described)