Colobostruma nancyae occurs in dry sclerophyll and heath habitats.
This distinctive species is immediately recognisable by its low, rounded mesosoma and reduced propodeal declivity. It is unlikely to be confused with other species in the genus.
Keys including this Species
- Key to Australian Colobostruma Species
- Key to Colobostruma of the southwestern Australian Botanical Province
Restricted to south-western Australia.
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
Beyond what is stated in the introduction at the top of this page, little is know about the biology of Colobostruma nancyae. Until further studies reveal more about this species we can infer that its natural history and biology should be similar to other species in this genus. In general Colobostruma can be locally common although they are often overlooked. Most species have small colonies with less than 100 workers, and workers will lie motionless when disturbed. Nests can occur in soil usually under rocks, in cracks in rocks or in rotten logs. Only a single rainforest species is known to nest arboreally. Foraging is usually on the ground at night but occasionally they are found foraging on mallee. They are also commonly found in leaf litter.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- nancyae. Colobostruma nancyae Brown, 1965b: 22, figs. 1-3 (w.) AUSTRALIA. See also: Shattuck, in Bolton, 2000: 45.
- Holotype, worker, 100 km. E of Esperance, about 8 km. NE of (old) Thomas River Station, Western Australia, Australia, 28-29 January 1955, E.O. Wilson, Museum of Comparative Zoology.
- Paratype, 1 worker, 15km [reported as 25km] S Mt. Ragged, Western Australia, Australia, 31 January 1955, Wilson & Haskins, Museum of Comparative Zoology.
- Paratype, 3 workers, 100 km. E of Esperance, about 8 km. NE of (old) Thomas River Station, Western Australia, Australia, 28-29 January 1955, E.O. Wilson, Museum of Comparative Zoology.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Shattuck (2000) - TL 2.9 - 3.7, HL 0.81 - 0.92, HW 0.84 - 1.08, CI 102 - 119, ML 0.18 - 0.20, MI 21 - 22, SL 0.38 - 0.51, SI 43 - 53, PW 0.66 - 1.02, AL 0.81 - 0.99 (4 measured). Anterior region of head rounding gradually from the dorsal to lateral surfaces, not phragmotic. In full-face view ridge immediately in front of eye weakly concave. Frontal lobes and lateral margins of clypeus smooth relative to the surrounding surface of the head. Mandibles triangular. Hairs absent from dorsum of head. Posterior margin of head weakly concave. Antenna with 6 segments, the scape strongly elbowed and with a weak lobe at the elbow. Anterior region of the pronotum expanded laterally as a weak flange. Propodeum low, its declivitous face greatly reduced and approximately the same height as the petiolar peduncle, the lamellae reduced to short, thickened ridges; in profile the dorsum of the alitrunk strongly convex. Petiole node low. Lateral postpetiole tapering gradually into a thin, semi-transparent flange. First gastral tergite with closely spaced fine longitudinal striations (absent from a narrow medial band) and with a narrow band of low, closely spaced carinae immediately posterior of the postpetiolar insertion . Body colour yellow brown, dorsum of head slightly darker.
- Bolton, B. 2000. The ant tribe Dacetini. Mem. Am. Entomol. Inst. 65: 1-1028 (page 45, see also)
- Brown, W. L., Jr. 1965b. Colobostruma nancyae species nov. Pilot Regist. Zool. Card No. 22. (page 22, worker described)
- Heterick, B. E. 2009. A guide to the ants of South-western Australia. Records of the Western Australian Museum, Supplement 76:1-206. PDF
- Shattuck, S. O. 2000. Genus Colobostruma. Genus Mesostruma. Genus Epopostruma. Pp. 31-67 in: Bolton, B. The ant tribe Dacetini. Mem. Am. Entomol. Inst. 65: 1-1028.