Gesomyrmex
Creators: name: Dlussky, Gennady M.
name: Wappler, Torsten
name: Wedmann, Sonja
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Gesomyrmex

description: Key for determination of gynes of Gesomyrmex
(gynes of extant species G. chaperi, G. howardi and G. kalshoveni unknown)
1. Anterior margin of clypeus straight or feebly concave (Figs. 3 B, 5A, 5B).................................................................. 2
- Anterior margin of clypeus projects as rounded lobe (Figs. 3 A, 4A–4C). Fossil species............................................ 4
2. Head more than 1.4 times longer than wide (Figs. 5 A, 5B). Living species................................................................ 3
- Head about 1.2 times longer than wide (Fig. 3 B). BL about 13 mm. Eckfeld, middle Eocene ...... G. flavescens sp. n.
3. Propodeum gradually rounded in side view. Eyes larger: head less than 3 times longer than maximum eye diameter. Posterior margin feebly concave (Fig. 5 A). BL about 8.5 mm. Philippines. ............................ G. luzonensis (Wheeler)
- Propodeum angulate in side view. Eyes smaller: head more than 3 times longer than maximum eye diameter. Poste- rior margin straight. (Fig. 5 B). BL about 9.5 mm. Vietnam. ....................................................... G. tobiasi Dubovikoff
4. Head subrectangular, with feebly concave posterior margin, about 1.1 times longer than wide (Fig. 4 B). BL 7–9 mm. Messel, middle Eocene .................................................................................................................. G. breviceps sp. nov.
- Head more than 1.2 times longer than wide ................................................................................................................. 5
5. Head subtrapezoid, broader in its anterior part than in its posterior part, with gradually rounded posterior margin,
without posterolateral corners. Eyes comparatively small: head 4.4 times longer than maximum eye diameter (Fig. 4 C). Messel, middle Eocene. .......................................................................................................... G. curiosus sp. nov. - Head subrectangular with distinctive rounded posterolateral corners (Figs. 2 A, 3A, 4A)........................................... 6
6. Eyes comparatively small: head 4.7 times longer than maximum eye diameter. Scape comparatively short: head 4.4 times longer than scape. Baltic, Bitterfeld, Rovno and Scandinavian ambers, late Eocene. .............. G. henschei Mayr
- Head 2.5 to 3 times longer than maximum eye diameter, and 3 to 3.3 times longer than scape (Figs. 3 A, 5A). ........ 7 7. Posterior margin distinctly concave (Fig. 4 A). Head and most part of mesosoma yellowish brown, mandibles, central part of scutum, whole scutellum and median parts of gastral tergites dark brown. BL 4.8 mm. Messel, middle Eocene ............................................................................................................................................... G. pulcher sp. nov.
- Posterior margin feebly convex (Fig. 8A. Whole body black. BL 9–10 mm. Eckfeld, middle Eocene. ...................... ................................................................................................................................................... G. germanicus sp. nov.
description: Published as part of Dlussky, Gennady M., Wappler, Torsten & Wedmann, Sonja, 2009, Fossil ants of the genus Gesomyrmex Mayr (Hymenoptera, Formicidae) from the Eocene of Europe and remarks on the evolution of arboreal ant communities, pp. 1-20 in Zootaxa 2031 on pages 13-14, DOI: 10.5281/zenodo.186261