Polyrhachis gibbosa

Identification
A member of the Polyrhachis aculeata species group in the subgenus Myrma

Kohout (2013): Polyrhachis gibbosa differs from the other species of the aculeata complex by the dorsal body surfaces being only partly polished and the mesonotum and propodeum being more distinctly sculptured. The mesosoma also appears somewhat shorter and relatively broad, with the pronotal spines only about as long as the width at their bases and the mesosomal dorsum is highly convex in lateral view. The body is entirely black with rather abundant, silvery, appressed pubescence, notably on the pronotal collar and along the dorsolateral margins and sides of the mesosoma.

Distribution based on Regional Taxon Lists
Oriental Region: Sri Lanka.

Nomenclature

 *  gibbosa. Polyrhachis aculeata var. gibbosa Forel, 1908a: 9 (w.) SRI LANKA. Forel, 1913k: 139 (footnote) (q.). Combination in P. (Myrma): Emery, 1925b: 205. Raised to species: Kohout, 2008a: 258.

Worker
Kohout (2013): Dimensions (syntypes): TL c. 5.85-6.35; HL 1.59-1.62; HW 1.31-1.37; CI 82-84; SL 1.87-1.93; SI 141-143; PW 1.18-1.25; MTL 1.87-1.96 (2 measured).