Biamomyrma, 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 : 143-144

Genus Biamomyrma gen. n.

Type species Biamomyrma zherikhini sp. n.

Diagnosis (for fossil imprints). Gyne. Petiole nodiform, sessile.Postpetiole bell-shaped, markedly broadly attached to 1st gastral (abdominal IV) segment. 1st gastral (abdominal IV) segment without tergosternal fusion. Scape comparatively short, not reaching the occipital margin. Mandibles triangular, dentate. Scutum does not overhang pronotum. Forewing with closed cells 3r, 1+2r, rm and mcu.

Species included. Three species described below.

Comparison. Differs from other fossil Myrmicinae in combination of bell-shaped postpetiole, short scape, and complete forewing venation. Outwardly similar to Agroecomyrmex Wheeler, 1915 . However key character of Agroecomyrmicinae is completely fused tergite and sternite of 1st gastral (abdominal IV) segment, whereas Biamomyrma gen. n. has 1st gastral segment without tergosternal fusion.

Notes. The material available does not permit identifying a number of the antennal segment in Biamomyrma : B. zherikhini sp. n. displays only 3 basal flagellar segments, in B. lata sp. n. flagellum is detached and preserves clearly 8segments which are not necessarily include the basalmost flagellar segment(s). Biamomyrma rugose sp.n. clearly preserves 9flagellar segments, but the apicalmost one have its apex ill-preserved, thus leaving doubts if it is really apical segment.

Etymology. From former name of locality (Biamo) and Greek Myrmica (ant).