Strumigenys ocypete

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

Strumigenys ocypete casent0217341 p 1 high.jpg

Strumigenys ocypete casent0217341 d 1 high.jpg

Specimen Labels

Known from a lowland forest, a worker collected on a log, and rainforest, a worker collected in a litter sample.

Identification

Bolton (2000) - A member of the Strumigenys extemena-group. The largest member of the group yet discovered, and with the most strongly developed cephalic sculpture. Unique features of ocypete include the acute but distinctly irregular crest across the vertex, and the flattened scale-like large hair that projects forward from the sharply angled leading edge of the scape at its widest point.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


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

Worker

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • ocypete. Pyramica ocypete Bolton, 2000: 420, figs. 259, 287 (w.) BORNEO. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 125

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 2.0, HL 0.48, HW 0.46, CI 96, ML 0.16, MI 33, SL 0.24, SI 52, PW 0.28, AL 0.5l. Leading edge of scape with a pronounced anteriorly projecting angle or elbow near the base, the apex of this angle with a single flat scale-like hair that projects anteriorly. Distal of this hair the leading edge only with minute apically curved spatulate hairs. Mandible mid-dorsally with a short straight low carina that extends forward from the mandible base to just distal of the level of the first large tooth. Dorsum of head with a sharply defined, acute but irregular and somewhat jagged, transverse crest across the highest point of the vertex. Eye minute, of a single ommatidium. Dorsum of head without standing hairs of any form. Clypeus finely granulate and dully shining. Dorsum of head behind clypeus densely reticulate-punctate, the individual punctures sharply defined. Surface also with scattered irregular rugulae, in particular a mid-dorsal rugule runs anteriorly from the midpoint of the crest. Other rugulae run posteriorly toward the occipital margin from the posterior face of the crest. Dorsal alitrunk and petiole without standing hairs but postpetiole with one pair posteriorly and first gastral tergite with a number of short straight erect hairs. Minute hairs on all surfaces of legs subdecumbent to appressed and directed toward the apices of the segments. Pronotum sharply marginate anteriorly and laterally, the margins raised; dorsal surface almost circular and shallowly depressed, shining and with faint vestiges of superficial sculpture. Mesonotum in dorsal view extremely compressed from side to side so that the dorsum is merely a narrow longitudinal blunt ridge. Anterior portion of propodeal dorsum also bilaterally compressed and in line with the preceding mesonotal ridge; in profile the two separated by a shallow concavity in the outline. Mesopleuron mostly smooth and shining but most of metapleuron and side of propodeum finely superficially sculptured rather than smooth. Propodeal declivity with broad lamellae. Petiole node in dorsal view broader than long, with superficial vestiges of punctulate sculpture. Postpetiole broad, unsculptured. Basigastral costulae strongly developed and very obvious, their length in dorsal view about equal to that of the postpetiole disc.

Type Material

Holotype worker, Malaysia: Sarawak, 4th. Division, Gn. Mulu Nat. Pk RGS Expd, Long Pala, 20.ix.1977, lowl. rainfor., on log (B. Bolton) (The Natural History Museum).

References

  • Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria” 99:1-191.
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 420, figs. 259, 287 worker described)