Vombisidris jacobsoni

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia.

Nomenclature

 *  jacobsoni. Atopula jacobsoni Forel, 1915a: 25 (w.) INDONESIA (Sumatra). Combination in Leptothorax: Forel, 1916: 458 (in text); in L. (Goniothorax): Emery, 1924d: 250; in Vombisidris (provisionally as holotype missing from Forel collection: Bolton, 1995b: 240); Bolton, 2003: 272. Combination in Vombisidris confirmed: Sorger, 2011: 151.

Description
DESCRIPTION OF WORKER: A species of the genus Vombisidris as defined by Bolton (1991), with the following characters. Colour of entire body light brown to yellow (two type specimens almost entirely light brown, one type specimen almost entirely yellow). Femora and tibiae lighter than rest of body (whitish yellow except for infuscated bases) (figs 1, 2, 3). Entire body with short thick, blunt (abruptly truncated apically) setae (some setae on postpetiole even slightly clavate); distinctly shorter setae on head (fig. 3), longer and finer setae on scapes (fig. 4). In addition, some fine, short scattered appressed hairs on gaster. Head, dorsum of mesosoma, petiole and postpetiole with distinct rugoreticulum. Spaces between costulae mostly smooth and shiny. Pronotum angulate, cervical shield with a few longitudinal ridges overlaying granulate microsculpture (figs 1, 2). Sides of mesosoma with some rugae overlaying microsculpture (fig. 3). Dorsum of petiolar peduncle with very finely reticulate sculpture. Gaster slightly depressed in lateral aspect, smooth and shiny, some short striae at base of tergite 1 (figs 1, 2, 3).Head slightly longer than wide, sides behind eyes feebly convergent (fig. 4). Eyes protruding and relatively large (EI 24, 25) containing 8-10 ommatidia in longest row. Clypeus strongly convex in lateral aspect (fig. 3), in full face view its anterior margin covered by its convexity (fig. 4). Subocular groove complete, from mandibular insertion backwards to latero-occipital margin. Mandibles smooth with some fine short hairs, hair pits indistinct (fig. 4). Dorsal and lateral faces of mesosoma forming an angle, mesosoma broadest at outer pronotal angles, continuously becoming narrower towards propodeum in dorsal aspect (maximum pronotum width ca. twice maximum propodeum width), sides feebly concave (figs 1, 2), dorsum evenly convex in lateral aspect, metanotal groove absent (fig. 3). Propodeum in dorsal aspect slender (figs 1, 2); spiracle situated below level of spines (fig. 3). Propodeal spines long, slightly downcurved in lateral aspect (fig. 3), curved inwards in dorsal aspect (figs 1, 2). Petiole (figs 1, 2, 3) with long peduncle bearing a pair of teeth in front of spiracle; anterior and dorsal face of node separated by a transverse ridge forming a blunt angle in lateral aspect, ventrally with anterolateral small teeth. Postpetiole in dorsal aspect (figs 1, 2) subtrapezoidal, widest anteriorly. Legs relatively short (FL < HW), femora and tibiae conspicuously thickened (figs 1, 2, 3).

References based on Global Ant Biodiversity Informatics

 * Forel A. 1915. Fauna Simalurensis. Hymenoptera Aculeata, Fam. Formicidae. Tijdschr. Entomol. 58: 22-43.
 * Sorger, D. M. 2011. Redescription and history of Vombisidris jacobsoni (Forel, 1915) (Hymenoptera, Formicidae). Revue Suisse de Zoologie 118:149-155.