Crematogaster treubi, Emery, 1896

Hosoishi, Shingo & Ogata, Kazuo, 2012, Revision of the Crematogaster brevis complex in Asia (Hymenoptera: Formicidae), Zootaxa 3349, pp. 18-30 : 20

Crematogaster treubi group

Workers monomorphic. The occipital carina undeveloped, not forming a distinct ridge ( Fig. 2 b). Pronotal shoulders not developed as distinct ridges. The petiole in dorsal view broader anteriorly than posteriorly, with rounded, not angular, anterolateral margins ( Fig. 3 b). The postpetiole weakly bilobed, but without distinct longitudinal median sulcus. Mesosoma with abundant standing hairs.

This species group is easily defined by the undeveloped occipital carina and generally 2-segmented antennal club, not only from C. brevis group, but also from other Asian Crematogaster species.

Figures

FIGURES 1 – 3. 1. Full face view of head. 1 a, Crematogaster treubi; 1 b, C. (Orthocrema) longipilosa. Arrow indicates anterolateral margin of clypeus. Scale bars are all 0.5 mm. 2. Occipital carina in posterior view. 2 a, Crematogaster overbecki; 2 b, C. bouvardi. Arrow indicates occipital carina. Scale bars are all 0.5 mm. 3. Petiole and postpetiole in dorsal view. 3 a, Crematogaster brevis; 3 b, C. treubi; 3 c, C. walshi. Scale bars are all 0.5 mm.