Leptogenys voeltzkowi

The pattern of distribution for L. voeltzkowi shows that it occupies the dry, transitional humid, lowland, and littoral forests in the north and northeast of Madagascar. It forages in leaf litter and nests mainly in rotten wood and under rocks.

Identification
Rakotonirina and Fisher (2014) - Worker. Median portion of clypeus projecting anteriorly into short, narrowly rounded lobe; anteriorly projecting peg-like setae present from near anterior margin of median lobe of clypeus, above semi-translucent lamella; antennal scape relatively short (SI: 101–114), less than one fourth its length surpassing posterior margin of head; in full-face view, eye not breaking line of cephalic lateral border; in profile, posterior margin of petiolar node with constriction at posteroventral angle, near junction to gaster; dorsum of body without erect hairs longer than maximum diameter of eye.

This species can be separated from the remainder of the group by the following combination of characters: the very short standing hairs, which may be absent, on dorsum of the body, and the eyes usually not breaking the line of the cephalic lateral margin. Specimens from the forest of Binara near Daraina have a head that is narrower posteriorly, eyes that break the outline of the sides of the head, and mandibles that increase in width from the basal third to near the apical teeth. Workers from RS Manongarivo and RS Marotandrano have a weak convexity at the mid-length of their mandible, and the width of the blades decreases towards the apical portion. Mandibular blades of specimens from both localities are longitudinally striate.

Key to Malagasy Leptogenys

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 *  voeltzkowi. Leptogenys voeltzkowi Forel, 1897c: 194 (w.) MADAGASCAR.

Description
SHOULD BE Worker

Worker
Rakotonirina and Fisher (2014) - (9 specimens). HW: 1.30–1.59, HL: 1.39–1.72, CI: 90–95, SL: 1.31–1.60, SI: 101–114, PW: 0.90–1.15, WL: 2.26–2.72, PNH: 0.77–0.92, PNL: 0.62–0.71, PNW: 0.71–0.84, DNI: 113–125, LNI: 123–134.

Head weakly broader at front than behind; sides feebly convex and diverging anteriorly; posterior margin very weakly concave. Eye large, slightly protruding from surface of head, and not breaking outline of side of head. Antennal scape relatively short (SI: 101–114). Clypeus with convex lateral margin, which strongly tapers into narrowly rounded anteromedian lobe; thin, rounded subopaque lamella surrounding anteromedial clypeal lobe. Mandible elongate and slender, feebly angulate near base and not fully closed against clypeus, leaving gap when at rest; basal groove narrowly impressed. In dorsal view, mesosoma with impressed metanotal groove; in profile, mesosoma somewhat high and short, with broadly convex dorsal margin; propodeal lobe absent. Posterior face of petiolar node impressed or with groove at about posteroventral portion, near junction to gaster; in profile, node about as high as broad, anterior face meeting in convex line with dorsal margin, forming distinct angle with posterior face. Constriction between third and fourth abdominal segments weakly noticeable. Mandible generally smooth between sparse punctures, with piligerous pits; head dorsum densely reticulate-rugulose, interspersed with small punctures. Dorsum of mesosoma, node of petiole and abdominal tergites III and IV generally punctate, with fine microreticulation. Sides of mesosoma rugulose at the suture between mesopleuron and metapleuron. Standing hairs and pubescence present on dorsum of head, but very short or absent on other parts of body dorsum. Black species, appendages dark brown with lighter apical portion; tip of gaster brown.

Type Material
Rakotonirina and Fisher (2014) - Lectotype worker, present designation, Madagascar, Antsiranana, Nosy-be (Voeltzkow), AntWeb specimen code CASENT0101888. Paralectotypes: two workers with same data but with the following specimen codes: CASENT0101947, CASENT0101989 (MHNG) [examined].