Ocymyrmex barbiger

Nothing is known about the biology of .

Identification
A member of the  barbiger group. One of three known species in which the base of the first gastral tergite is not constricted to a narrow neck, barbiger is separable from both others showing this character (Ocymyrmex cavatodorsatus, Ocymyrmex turneri) by its possession of an impressed anterior clypeal margin and its strong sculpture. (Bolton 1981)

Distribution based on Regional Taxon Lists
Afrotropical Region: Botswana, Namibia, South Africa.

Nomenclature

 *  barbiger. Ocymyrmex barbiger Emery, 1886: 364, pl. 17, figs. 9-11 (w.m.) SOUTH AFRICA. [Misspelled as barbatus by Emery, 1892a: 114.] Bolton, 1981b: 261 (q.). See also: Bolton & Marsh, 1989: 1291.

Worker
Bolton (1981) - TL 6.7-7.2, HL 1.54-1.84, HW 1.42-1.76, CI 90-97, SL 1.38-1.58, SI 87-98, PW 0.94-1.10, AL 2.00-2.20 (20 measured).

Anterior clypeal margin with a semicircular median impression which is flanked by a pair of teeth. The impression is usually deep and conspicuous but in some individuals may be broad and quite shallow. The flanking teeth are generally well developed but commonly are broadly triangular and blunted, sometimes little more than broadly rounded prominences. Maximum diameter of eye 0.32-0.35, about 0.19-0.22 x HW, in full face view not breaking the outline of the sides of the head. Promesonotum forming an evenly rounded low convexity which slopes downwards behind to the propodeum, the dorsum of which varies from more or less flat to slightly inclined. Propodeal dorsum rounding broadly and evenly into the declivity. Metapleural lobes low but prominent, their free edges rounded to bluntly truncated posteriorly. Petiole node in profile usually quite high, bluntly rounded-subconical in shape, but sometimes the dorsum more flattened and the node appearing less regular in shape. Petiole node in dorsal view usually broader than long, less commonly only about as broad as long. Postpetiole always broader than long in dorsal view, discounting the anterior articulating portion. Base of first gastral tergite without a neck-like constriction. Head finely and densely rugulose, with fine punctulate ground-sculpture; the pattern formed by the rugulae very variable on the dorsum but apparently following a step by step change. In many the cephalic rugulae are regular and longitudinal, parallel on the central strip and running straight back to the occipital margin, but the more lateral rugulae tending to diverge and arch outwards behind the eyes. This seems the basic pattern from which the following derive sequentially. Firstly, the median-line rugulae begin to diverge posteriorly, forcing the more lateral rugulae to arch outwards even more. Next, the point at which the median-line rugulae begin to diverge shifts gradually forward, arching the lateral components more strongly outwards all the time. When the point of divergence of the mid-line rugulae has shifted a certain distance forwards a number of V-shaped rugulae appear in front of the impression in the centre of the occipital margin, which occupy the space vacated by the now divergent mid-line rugulae. Then, as the point of divergence of the mid-line rugulae shifts still further forward the V -shaped rugulae also shift forward on the head and their angle becomes more obtuse the further forward they shift. This process continues until ultimately the head is mostly transversely sculptured behind the eyes, although the rugulae tend to retain their broadly V -shaped nature more posteriorly on the head. Pronotal dorsum usually with extensive longitudinal sculpture, the more lateral components arching across in front of the central longitudinals. Space between mesothoracic spiracles usually longitudinally rugose, sometimes obliquely so and very rarely the sculpture here more or less transverse. Remainder of dorsal alitrunk transversely rugose. Petiole with transverse rugulae ventrally which usually extend for some distance up the sides of the node, commonly to the dorsum. In more strongly sculptured samples the rugulae continue across the top of the node but often the dorsum is more weakly sculptured. Postpetiole finely shagreened or with fine superficial patterning only. All dorsal surfaces of head and body with hairs, those on the first gastral tergite more numerous and longer in barbiger than is usual in the genus, the gastral hairs frequently approaching the length and density seen on the alitrunk. Elsewhere in the genus gastral hairs on the first tergite are much shorter and much sparser than on the alitrunk. Colour of head and alitrunk orange to dull brick red, the gaster darker, frequently dull brown with a reddish tint or even blackish brown.

Type Material
Bolton (1981) - Syntype workers and male, South Africa: Cape of Good Hope (L. Peringuey) [examined].

References based on Global Ant Biodiversity Informatics

 * Addison P., and M. J. Samways. 2000. A survey of ants (Hymenoptera: Formicidae) that forage in vineyards in the Western Cape Province, South Africa
 * Arnold G. 1916. A monograph of the Formicidae of South Africa. Part II. Ponerinae, Dorylinae. Annals of the South African Museum. 14: 159-270.
 * Bolton B. 1981. A revision of six minor genera of Myrmicinae (Hymenoptera: Formicidae) in the Ethiopian zoogeographical region. Bulletin of the British Museum (Natural History). Entomology 43: 245-307.
 * Bolton B., and A. C. Marsh. 1989. The Afrotropical thermophilic ant genus Ocymyrmex (Hymenoptera: Formicidae). Journal of Natural History 23: 1267-1308.
 * Emery C. 1886. Alcune formiche africane. Bullettino della Società Entomologica Italiana 18: 355-366.
 * French K., and R. E. Major. 2001. Effect of an exotic Acacia (Fabaceae) on ant assemblages in South African fynbos. Austral Ecology 26: 303310.
 * Hanrahan S. A., M. J. Steinbauer, and F. D. Duncan. 2014. Ant assemblages in a poorly sampled part of the arid Nama Karoo. African Entomology 22(2): 448453.
 * IZIKO South Africa Museum Collection
 * Koen J. H., and W. Breytenbach. 1988. Ant species richness of fynbos and forest ecosystems in the Southern Cape. South Afr. Tydskr. Dierk. 23(3): 184-188.
 * Marsh A. C. 1985. Forager abundance and dietary relationships in a Namib Desert ant community. S. Afr. J. Zool. 20: 197-203.
 * Marsh A. C. 1985. Microclimatic factors influencing foraging patterns and success of the thermophilic desert ant, Ocymyrmex barbiger. Insectes Sociaux 32: 286-296.
 * Marsh A. C. 1986. Ant species richness along a climatic gradient in the Namib Desert. Journal of Arid Environments 11: 235-241.
 * Wheeler W. M. 1922. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VIII. A synonymic list of the ants of the Ethiopian region. Bulletin of the American Museum of Natural History 45: 711-1004