Strumigenys deinognatha

Known from a small number of samples, specimens have been obtained from litter samples in rain forest.

Identification
Bolton (2000) - A member of the Strumigenys extemena-group. The unique worker of deinognatha has a mandible structure (see below) that is shared only with Strumigenys extemena. The two are distinguished by the distribution of scale-like cephalic hairs, shape of the pronotum and development of propodeal teeth.

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

Nomenclature

 *  deinognatha. Pyramica deinognatha Bolton, 2000: 419 (w.) BORNEO. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 118

Worker
Holotype. TL 1.6, HL 0.42, HW 0.38, CI 90, ML 0.16, MI 38, SL 0.21, SI 55, PW 0.21, AL 0.42. Dorsal surfaces of the massively developed mandibles strongly sloping downward from the masticatory margins to the outer margins; in frontal view the masticatory margins are elevated and the dorsum on each side forms a flat slope that falls away steeply so that the two mandibles form a triangle with the masticatory margin at its apex. Counting from the base of the mandible teeth 3 and 7 are enlarged. Base of scape with a broad, prominent but evenly rounded subbasal angle. Hairs on the leading edge of the scape all small, scale-like to spoon-shaped and curved toward the apex of the scape; without an isolated, conspicuously enlarged and differently shaped hair at the apex of the curvature. Dorsum of head covered with small decumbent to appressed scale-like hairs, without standing pilosity of any form. Dorsal alitrunk without standing hairs. Pronotum in dorsal view with its dorsolateral margins evenly convex and posteriorly curving smoothly to their junction with the mesonotum. Pronotal dorsum flat and finely shagreenate. Propodeal declivity with lamellae but without teeth. Petiole node broader than long. First gastral tergite with a few short stout erect hairs apically and basally. Basigastral costulae short but numerous and strongly developed.

Type Material
Holotype worker, Malaysia: Sabah (“North Borneo (SE))” on data label), Tawau, Quoin Hill, 8.viii.1962, Berlese funnel collection, Bishop (Y. Hirashima).



References based on Global Ant Biodiversity Informatics

 * CSIRO Collection
 * Pfeiffer M.; Mezger, D.; Hosoishi, S.; Bakhtiar, E. Y.; Kohout, R. J. 2011. The Formicidae of Borneo (Insecta: Hymenoptera): a preliminary species list. Asian Myrmecology 4:9-58