Temporal range: Bartonian, Middle to Late Eocene Baltic amber, Baltic Sea region
(Wheeler, W.M., 1915)
Dlussky (1997) postulated that this species likely did not belong in Iridomyrmex and that it “... most probably should be placed into another genus ...” However, he did not erect a new genus for it as he only had Wheeler’s (1915) drawing available and did not feel this was sufficient to establish a new genus. It is clear that this species does not belong to Iridomyrmex, and is, in fact, so distinct that assignment to a separate, and new, genus seems straightforward. This genus, Eldermyrmex, was established by Shattuck (in Heterick & Shattuck, 2011).
This taxon was described from Baltic amber (Bartonian, Middle to Late Eocene).
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- †oblongiceps. †Iridomyrmex oblongiceps Wheeler, W.M. 1915h: 93, fig. 45 (w.) BALTIC AMBER (Eocene). Provisionally retained in Iridomyrmex: Shattuck, 1992a: 16. Combination in †Ctenobethylus: Dlussky & Rasnitsyn, 2009: 1036; in †Eldermyrmex: Shattuck, in Heterick & Shattuck, 2011: 170.
- Dlussky, G.M. 1997. Genera of ants from Baltic Amber. Paleontological Journal, 31(6), 616–627.
- Dlussky, G.M. & Rasnitsyn, A.P. 2009. Ants in the Upper Eocene amber of central and eastern Europe. Paleontological Journal 43: 1024-1042.
- Heterick, B.E. & Shattuck, S.O. 2011. Revision of the ant genus Iridomyrmex (Hymenoptera: Formicidae). Zootaxa 2845: 1–174.
- Shattuck, S.O. 1992. Review of the dolichoderine ant genus Iridomyrmex Mayr with descriptions of three new genera (Hymenoptera: Formicidae). J. Aust. Entomol. Soc. 31: 13-18.
- Wheeler, W. M. 1915. The ants of the Baltic Amber. Schr. Phys.-Ökon. Ges. Königsb. 55: 1-142.