Disogmus rasnitsyni Kolyada & Perkovsky

Kolyada, V. & Perkovsky, E., 2011, A new species of the genus Disogmus Foerster (Hymenoptera, Proctotrupoidea, Proctotrupidae) from the Eocene Rovno amber, ZooKeys 130, pp. 455-459 : 456

Disogmus rasnitsyni Kolyada & Perkovsky sp. n. Figs 1-2

Holotype.

♂, SIZK K-3806, Klesov, Rovno amber, Late Eocene. Syninclusions: Diptera ( Chironomidae and Tipuloidea ), Tipuloidea .

Etymology.

Named in honor of the paleoentomologist Prof. Alexander Rasnitsyn.

Description.

Length of body 2.5 mm; length of forewing 1.5 mm. Antenna short, length to width ratio of 1, 2 and 9 flagellomeres as 2.5:1.0; 1.7:1.0; 1.3:1.0. Tyloids on flagellar segments 2-4, the tyloids in form of subtriangular slaws that is about 0.3 as long at base as the segments are long (Fig. 2). Side of collar weakly rugulose. Epomia not interrupted. Notaulus quite long, reaching beyond center of mesoscutum. Stigma narrow, r-rs (vertical part of radius) about 3.4 times as long as wide. Radial cell long, side next to costa about 0.8 as long as radius. Mesopleuron below tegula with some fine horizontal wrinkles. Metapleuron rugose, with a small but distinct carina from its upper front part to anterolateral edge of propodeum.

Comparison.

Within the genus Disogmus , the new species is most similar to Disogmus basalis (Thomson, 1857), in particular, by the shape of tyloids and the general shortening of the segments of antennae. The new species distinctly differs from Disogmus basalis and the other species of the genus by having tyloids on flagellar segments 2-4 compared to 3-6 and 4-7 that other species have.