Strumigenys carinognatha

Identification
Bolton (2000) - A member of the Strumigenys extemena-group. Three species in the group are isolated by the specialised morphology of the basidorsal mandible described above, Strumigenys atopogenys, carinognatha and Strumigenys tarbosyne. Of these atopogenys is the largest species, with the mandibular carina least strongly developed. In addition atopogenys has the mandibles and dorsum of the head behind the clypeus smooth, completely lacks elongate standing hairs on the dorsal head and alitrunk, and lacks a specialised enlarged hair on the leading edge of the scape close to its widest point. In both carinognatha and tarbosyne the mandibles are finely sculptured and dull, the head behind the clypeus is reticulate-punctate, at least the head has elongate standing hairs, and the scape has an enlarged specialised hair at or near its broadest point. Differences separating the remaining two species are as follows.

S. carinognatha: Vertex with a single pair of standing hairs, located behind the highest point. Mesonotum without erect hairs. Eye of 2-5 ommatidia. Transverse crest on vertex sharp and acute. Base of mandibular masticatory margin with 3-4 minute denticles between two enlarged teeth.

S. tarbosyne: Vertex with a transverse row of 6 standing hairs in front of highest point and a row of 4 hairs behind highest point. Mesonotum with a single pair of erect hairs. Eye of a single ommatidium. Transverse crest on vertex low, obtuse and blunt. Base of mandibular masticatory margin with a single small tooth between two enlarged teeth.

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

Nomenclature

 *  carinognatha. Pyramica carinognatha Bolton, 2000: 418, figs. 260, 288 (w.) INDONESIA (Sumatra). Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 117

Worker
Holotype. TL 1.7, HL 0.44, HW 0.40, CI 91, ML 0.14, MI 32, SL 0.22, SI 55, PW 0.24, AL 0.46. In full-face view base of dorsal surface of mandible depressed, flat to shallowly concave both longitudinally and transversely. Depressed area bounded by a carina that arises slightly mesad of the outer basal angle of the mandible, extends anteriorly along the dorsum of the mandible close to its outer margin, then curves medially across the dorsal width of the mandible, petering out before it meets the masticatory margin at about the fifth or sixth tooth from the base. Proximally the depressed area is bounded by the transverse rim that crosses the mandible in front of the anterior clypeal margin. In oblique view the lateral component of the carina is tall and very conspicuous. Leading edge of scape broadly rounded at its widest point, with a relatively large spoon-shaped hair near the greatest width of the scape and distal of this bearing a series much smaller spatulate hairs: all curve toward the apex of the scape. Clypeus smooth and shining, dorsum of head behind clypeus reticulate-punctate. Eye small, with only 2-3 ommatidia in total. Vertex behind the sharply defined transverse carina with a single pair of erect simple hairs that are quite short and stout. Pronotum and mesonotum without standing hairs of any form. Simple standing hairs present on postpetiole and first gastral tergite, curved on the former but more or less straight and erect on the gaster. Pronotal dorsum flat, in dorsal view strongly marginate dorsolaterally, the marginations shallowly convex and converging posteriorly. Propodeal declivity with lamellae but without teeth.

Paratypes. TL 1.7-1.9, HL 0.43-0.46, HW 0.39-0.41, CI 87-93, ML 0.13-0.14, MI 30-32, SL 0.20-0.22, SI 53-56, PW 0.23-0.26, AL 0.45-0.50 (7 measured). As holotype but eye varying in size from 2-5 ommatidia.

Type Material
Holotype worker, Indonesia: Sumatra, Jambi, Rantau Pandan, nr Muarabungo, 150 m., 10.vi.1991, He 18L, SUM 255 (Deharveng & Bedos).

Paratypes. 7 workers with same data as holotype (MNHN,, ).