Strumigenys lebratyx

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

Strumigenys lebratyx casent0102613 profile 1.jpg

Strumigenys lebratyx casent0102613 dorsal 1.jpg

Specimen labels

Known from wet forest habitats, all specimens of this species have been found in litter-samples.

Identification

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

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

Nomenclature

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

  • lebratyx. Strumigenys lebratyx Bolton, 2000: 759 (w.) BORNEO.

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 3.2, HL 0. 87, HW 0.68, CI 78, ML 0.31, MI 36, SL 0.44, SI 65, PW 0.42, AL 0.92. Mandible relatively short for a member of this group; preapical tooth broken on each mandible in holotype. Dorsolateral margin of head in full-face view with 6 or more freely laterally projecting filiform hairs, including one in apicoscrobal position; dorsal surface of dorsolateral margin, from level of eye to occipital corner, also with standing hairs that are directed dorsally or more dorsally than laterally. Cephalic dorsum with standing fine hairs present from occipital margin to a level anterior to highest point of vertex. Dorsum of head finely and narrowly reticulate-rugulose, the rugulae and their small reticulae finely densely punctulate. Apical funicular segment not constricted basally. Entire dorsal alitrunk and side of pronotum sharply and very densely punctate to punctate-granulate, promesonotum also with very small rugulae. Pleurae and side of propodeum everywhere densely punctate to reticulate-punctate. Anterior coxae punctate and with vestiges of transverse costulate sculpture. Pronotal humeral hair long and filiform, shallowly curved. Dorsal alitrunk with numerous erect simple hairs, more than 4 pairs on pronotum and 6 or more pairs on mesonotum. First gastral tergite with numerous filiform shallowly curved hairs. Dorsal and ventral surfaces of hind femur with a row of suberect hairs, sparser ventrally than dorsally; dorsal (outer) surfaces of hind tibia and basitarsus each with a few long erect freely projecting hairs. Propodeal teeth stout, in profile longer than basal width. Petiole in profile subclavate, the node forming an even shallow curvature that in dorsal view is longer than broad.

Type Material

Holotype worker, Malaysia: Sabah, Crocker Ra. N. P., KK-Tembunan km. 60, 1270 m., 17.v.1987, #29a (Burckhardt & Lobl) (Musee d'Histoire Naturelle Genève).

References

  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 760, worker described)

References based on Global Ant Biodiversity Informatics

  • Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58
  • Woodcock P., D. P. Edwards, R. J. Newton, C. Vun Khen, S. H. Bottrell, and K. C. Hamer. 2013. Impacts of Intensive Logging on the Trophic Organisation of Ant Communities in a Biodiversity Hotspot. PLoS ONE 8(4): e60756. doi:10.1371/journal.pone.0060756
  • Woodcock P., D. P. Edwards, T. M. Fayle, R. J. Newton, C. Vun Khen, S. H. Bottrell, and K. C. Hamer. 2011. The conservation value of South East Asia's highly degraded forests: evidence from leaf-litter ants. Phil. Trans. R. Soc. B. 366: 3256-3264.
  • Woodcock P., D.P. Edwards, T.M. Fayle, R.J. Newton, C. Vun Khen, S.H. Bottrell, and K.C. Hamer. 2011. The conservation value of South East Asia's highly degraded forests: evidence from leaf-litter ants. Phil. Trans. R. Soc. B 366: 3256-3264.