Gesomyrmex

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, Zootaxa 2031, pp. 1-20 : 13-14

publication ID

https://doi.org/ 10.5281/zenodo.186261

publication LSID

lsid:zoobank.org:pub:0919CF2B-DBC2-4504-B48A-8AD0D01695DB

DOI

https://doi.org/10.5281/zenodo.6223494

persistent identifier

https://treatment.plazi.org/id/E378AE58-D310-FFFF-FF78-FA364CAC76AB

treatment provided by

Plazi

scientific name

Gesomyrmex
status

 

Key for determination of gynes of Gesomyrmex View in CoL

(gynes of extant species G. chaperi , G. howardi and G. kalshoveni unknown)

1. Anterior margin of clypeus straight or feebly concave ( Figs. 3 View FIGURE 3 B, 5A, 5B).................................................................. 2

- Anterior margin of clypeus projects as rounded lobe ( Figs. 3 View FIGURE 3 A, 4A–4C). Fossil species............................................ 4

2. Head more than 1.4 times longer than wide ( Figs. 5 View FIGURE 5 A, 5B). Living species................................................................ 3

- Head about 1.2 times longer than wide ( Fig. 3 View FIGURE 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 View FIGURE 5 A). BL about 8.5 mm. Philippines. ............................ G. luzonensis (Wheeler) View in CoL

- Propodeum angulate in side view. Eyes smaller: head more than 3 times longer than maximum eye diameter. Poste- rior margin straight. ( Fig. 5 View FIGURE 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 View FIGURE 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 View FIGURE 4 C). Messel, middle Eocene. .......................................................................................................... G. curiosus sp. nov. - Head subrectangular with distinctive rounded posterolateral corners ( Figs. 2 View FIGURE 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 View FIGURE 3 A, 5A). ........ 7 7. Posterior margin distinctly concave ( Fig. 4 View FIGURE 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.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

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