Liometopum incognitum, Dlussky & Rasnitsyn & Perfilieva, 2015

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 : 136

Liometopum incognitum sp. n.

( Fig. 9)

Material. Holotype PIN 3429/1157, dorsal imprint of gyne. Biamo.

Description. Gyne. Body length 14.5mm. Head 0.8times as long as wide, with rounded occipital corners and concave occipital margin.Anterior margin of clypeus concave. Frontal carinae short, divergent. Eyes oval, situated on the midlength of head; maximum eye diameter about 0.35 times head length. Scutum 1.1 times as long as wide. Scutellum transverse. Wing venation incompletely preserved: cell rm closed as implied by presence of rs-m, rs-m meeting RS distal of2r-rs.

Measurements of holotype, mm: HL 2.1; HW 2.6; ED 0.6; SctL2.6; SctW2.4.

Comparison. Differs from L. miocenicum and L. scudderi from Oligocene deposits of Florissant [ Carpenter, 1930] in the shape of the head of gynes (the head in these species is longer than wide, with a straight occipital margin). Differs from L. patamophilum , L. lubricum (Shanwang, Miocene) , L. imhoffii (Radoboj, Miocene) and recent L. microcephalum Panzer, 1798 and L. orientale Karavaiev, 1927 in having rs-m and 2r-rs distant on RS and no coinciding as in the above species. Liometopum eremicum (Shanwang, Miocene) differs in being half as big as the new species (being 7.1 long) and having eyes much shifted forwards.

Etymology. Incognitum is the Latin for unknown.