Gesomyrmex magnus

Dlussky, G. M., Rasnitsyn, A. P. & Perfilieva, K. S., 2015, The Ants (Hymenoptera: Formicidae) of Bol’shaya Svetlovodnaya (Late Eocene of Sikhote-Alin, Russian Far East), Caucasian Entomological Bulletin 11 (1), pp. 131-152: 138

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Gesomyrmex magnus

sp. n.

Gesomyrmex magnus  sp. n.

( Fig. 12)

Material. Holotype PIN 3429/101, print and counterprint of gyne. Biamo.

Description. Gyne. Body length 20.5 mm. Head subrectangular, about 1.25 times longer than wide, with nearly parallel sides, and rounded occipital corners. Anterior clypeal margin projected as small rounded lobe. Eyes ovate; head 4.4times longer than maximum eye diameter. Scape not visible, however position of preserved three 1st funicular segments indicate that it was very short, not reaching middle of eye.Funicular segments1–3 a little longer than wide. Mandible massive, triangular, with acute apical tooth;dentition of masticatory margin not visible.Mesosoma about as wide as head. Metacoxae approximated but not contact. Legs comparatively short and thick. Gaster ovate. Forewing with closed cells1+2r, 3r and mcu. Cell1+2r about 3times longer than wide. Cell 1+2r 3 times longer than wide. Cell 3r 5 times longer than wide. Section RS+M after 2r-rs about as long as 3–4 vein thickness. Cell mcu small, rhomboidal.

Measurements of holotype, mm: AL 7.7; HL 4.2; HW 3.3; ED0.95; FWL12.5.

Comparison. Differs from all known living and fossil gynes of Gesomyrmex  by size. Body length of all other specie less than 11mm.

Etymology. Magnus  is the Latin for large.