Strumigenys euryale

Identification
Bolton (2000) - Strumigenys euryale is immediately identified by its unique clypeal crest. Its propodeum, with sharp spines subtended by a carina rather than a lamella, also occurs in Strumigenys rudinodis (see there) and its allies. In these species, however, the propodeal lobes are acutely triangular, whereas in euryale the propodeal lobes are low and broadly rounded. A similar propodeal structure is seen only in Strumigenys stheno, but this is a densely hairy species with a shallowly convex clypeus and a row of straight simple long hairs project forward at right-angles to the leading edge of the scape.

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

Nomenclature

 *  euryale. Pyramica euryale Bolton, 2000: 432, fig. 272 (w.) BORNEO. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 119

Worker
Holotype. TL 2.8, HL 0.76, HW 0.50, CI 66, ML 0.05, MI 7, SL 0.36, SI 72, PW 0.30, AL 0.78. Anterior half of clypeal dorsum with its centre raised into a high median longitudinal crest that is densely clothed with spatulate hairs. In full-face view the upper scrobe margin with a row of anteriorly curved appressed small spatulate hairs; without freely projecting long hairs of any form. Dorsolateral margin of occipital lobe, behind the level of the scrobe, with 2 freely projecting long simple hairs that curve anteriorly. Cephalic dorsum behind clypeus finely rugulose to reticulate-rugulose; spaces between rugular sculpture on vertex with weak punctulate ground-sculpture. Leading edge of scape with apically-directed minute appressed hairs only. Eye with 4 ommatidia in longest row. Dentition discussed in introduction to group. With head i n profile the dorsum without standing hairs except for a single transverse row close to the occipital margin. Pronotum sharply marginate dorsolaterally, with a long simple humeral hair and 1-2 others arising from the margin; dorsum between the marginations more or less flat, with scattered longitudinal rugulae and without elongate standing hairs. Dorsum of mesonotum with 3 pairs of simple standing hairs, the posteriormost pair almost at the metanotal groove. Dorsal (outer) surfaces of middle and hind tibiae with freely projecting simple hairs, the longest of them about equal to the maximum tibial width or only very slightly more. Similar hairs also arise from the femora. Propodeum armed with a pair of short acute spines that are subtended by narrow carinae; these terminate at the base of the declivity in a pair of low rounded propodeal lobes that are not laminate nor spongiform. Side of alitrunk mostly unsculptured but irregular, and with a few transverse rugulae on the mesopleuron. Lateral spongiform lobe of petiole restricted to posterolateral portion of node, distinctly not extending to level of anterior face of node.

Paratypes. TL 2.8-3.0, HL 0.76-0.81, HW 0.48-0.52, CI 63-67, ML 0.04-0.06, MI 5-8, SL 0.34-0.37, SI 71-79, PW 0.30-0.34, AL 0.78-0.86 (7 measured). As holotype but eye with 4-5 ommatidia in the longest row. Dorsolateral margin of occipital lobe with 1-3 laterally projecting elongate curved simple hairs.

Type Material
Holotype worker, Malaysia: Sabah, Crocker Range, 1600 m., 18.v.1987, no. 30a (Lobl & Burckhardt). Paratypes. 13 workers with same data as holotype; 2 workers with same data but Crocker Range, K.K. - Tambunan, no. 30; 1 worker, Sabah, Mt Kinabalu, Liwagu Trail, 1500 m., 21.v.1987, no. 34a (Lobl & Burckhardt) (MHN,, , ).