Strumigenys dentinasis

Identification
Bolton (2000) - This striking species is immediately diagnosed by its possession of an anteriorly inclined anteromedian tooth on the clypeal dorsum. It is closest related to Strumigenys abditivata but in that species the dorsal clypeus is toothless, the mandibles are densely sculptured, the pronotal humeri lack hairs and are not sharply angulate, and the lateral lobe of the petiole is thin and lamellate rather than distinctly spongiform.

Distribution based on Regional Taxon Lists
Neotropical Region: Brazil.

Nomenclature

 *  dentinasis. Gymnomyrmex dentinasis Kempf, 1960f: 450, figs. 24, 26, 30 (w.) BRAZIL. Combination in Pyramica: Bolton, 1999: 1672; in Strumigenys: Baroni Urbani & De Andrade, 2007: 118. See also: Bolton, 2000: 232.

Worker
TL 2.6-2.8, HL 0.76-0.78, HW 0.62-0.66, CI 82-85, ML 0.06-0.07, MI 8-9, SL 0.30-0.32, SI 46-52, PW 0.34-0.37, AL 0.74-0.82 (4 measured).

Midline of clypeal dorsum, just behind the anterior margin, with an acute tooth that is inclined forward; the tooth very conspicuous in profile. In full-face view frontal lobes and frontal carinae considerably expanded laterally, the preocular carinae not visible. Outer edges of upper scrobe margins evenly divergent posteriorly, not sinuate. Frontal lobe with a small fenestra immediately above the antennal insertion, each expanded frontal carina with two much larger fenestrae behind this. Dorsolateral margins of head without freely projecting hairs of any form; cephalic dorsum without standing hairs. Vertex smooth and shining but some weak sculpture present on upper scrobe margins. Pronotal dorsum transversely flat, sharply marginate dorsolaterally; pronotal humerus sharply angulate and with a simple curved humeral hair. Dorsal pronotum otherwise without standing hairs; mesonotum with two pairs of short standing hairs. First gastral tergite with simple short standing hairs arising on the whole surface. Short decumbent to appressed fine hairs present on middle and hind tibiae. Discs of petiole and postpetiole unsculptured, the lateral lobe of the petiole distinctly spongiform.

Type Material
Holotype worker and paratype worker, BRAZIL: Parana, Rio Azul, 1000 m., x.1959, no. 3150 (F. Plaumann) [examined].