Strumigenys emmae group

Strumigenys emmae group Bolton (2000)

Austral

 * Strumigenys anchis
 * Strumigenys bibis
 * Strumigenys emmae
 * Strumigenys miniteras
 * Strumigenys pnyxia
 * Strumigenys radix
 * Strumigenys sutrix

Strumigenys emmae also occurs in the Neotropical-Nearctic region.

Worker Diagnosis
Apical fork of mandible with 1 - 3 minute intercalary denticles (not visible when mandibles fully closed). Mandible with a long-conical to spiniform preapical tooth; there may also be a minute tumulus, denticle or shorter tooth between the preapical tooth and the apicodorsal tooth. Mandibles linear, usually broadest at about the basal third and outer margins convex at full closure. MI 26 - 42.

Anterior clypeal margin very broad, transverse to shallowly convex; anterolateral angles of clypeus project farther laterally than the outermost points of the fully closed mandibles.

Antenna with 4 or 6 segments; apical segment not constricted basally before its articulation with the preapical segment.

Leading edge of scape with all hairs spatulate or spoon-shaped and curved toward apex of scape. Scape slightly to distinctly flattened, broadest at about midlength; short to moderate, SI 52 - 73.

Preocular carinae very broad in full-face view, in profile short and terminating before level of the very small eye.

Upper scrobe margin sharply defined behind level of eye.

Ventrolateral margin of head in front of eye sharply defined, usually about straight or forming an even shallow curve, but with a deep broadly U-shaped preocular impression in one species (anchis). Postbuccal groove small and indistinct.

Propodeum with a small tooth that is almost fully engaged with a broad lamella, the latter extending down the declivity and without a ventral tooth.

Ventral surface of petiole with spongiform tissue. Base of first gastral sternite with a weak to moderate spongiform pad.

Pilosity. Pronotal humeral hair absent or present. Head with spatulate to broadly scale-like or orbicular hairs; upper scrobe margin fringed with similar hairs. First gastral tergite with short stiff simple to clavate hairs that are suberect to erect.

Sculpture. Head and alitrunk predominantly or entirely reticulate-punctate, frequently with a smooth area on mesopleuron that may also extend to metapleuron and side of propodeum. Base of first gastral sternite not longitudinally costulate.