Gesomyrmex germanicus

†Gesomyrmex germanicus Temporal range: Lutetian, Middle Eocene K Pa Eo Ol Mi Pl ↓ Eckfeld, Germany
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Formicinae
Tribe:	Gesomyrmecini
Genus:	Gesomyrmex
Species:	†G. germanicus
Binomial name
†Gesomyrmex germanicus Dlussky, Wappler & Wedmann, 2009

No formal diagnosis or comparative comments were provided when this species was described. The species was erected based on its Eocene age, without comparison to extant taxa (Aria et al., 2023).

Identification

• Head shape (head length/head width): 1.30 ± 0.1.
• Relative eye diameter (head length/eye diameter): 0.32 ± 0.01.

Gesomyrmex germanicus and Gesomyrmex macrops have similar head lengths and shapes (Aria et al., 2023).

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  Cephalic morphometrics of gynes for relevant fossil Gesomyrmex species. (a) Head length (HL). (b) Normalized head shape (head length/head width, HRN, squares) and normalized relative eye diameter (eye diameter/head length, HERN, diamonds). Abbreviations: flav., flavescens; germ., germanicus; hoern., hoernesi. (Aria et al., 2023, Fig. 4)

Distribution

This taxon was described from Eckfeld, Germany (Lutetian, Middle Eocene).

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

• †germanicus. †Gesomyrmex germanicus Dlussky, Wappler & Wedmann, 2009: 10, figs. 3A, 6I (q.) GERMANY.

References

• Aria, C., Jouault, C., Perrichot, V., Nel, A. 2023. The megathermal ant genus Gesomyrmex (Formicidae: Formicinae), palaeoindicator of wide latitudinal biome homogeneity during the PETM. Geological Magazine, 1–11 (doi:10.1017/s0016756822001248).
• Dlussky, G.M., Wappler, T., Wedmann, S. 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: 1-20 (doi:10.11646/zootaxa.2031.1.1).