First record of the parasitoid family Ismaridae (Hymenoptera, Diaprioidea) from Eocene Baltic and Rovno ambers with the description of a new genus and two new species Author Chemyreva, Vasilisa G. Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034, Russia Author Perkovsky, Evgeny E. Natural History Museum of Denmark, Universitetsparken 15, Copenhagen, 2100, Denmark Author Vasilenko, Dmitry V. Cherepovets State University, Lunacharsky Prospect 5, Cherepovets, Vologda Region, 162600, Russia & Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya 123, Moscow, 117647, Russia text Zootaxa 2024 2024-03-01 5418 4 328 338 http://dx.doi.org/10.11646/zootaxa.5418.4.2 journal article 10.11646/zootaxa.5418.4.2 1175-5326 10730579 7BF20349-9A30-4230-8A6B-38CF6A4C144B Lubomirus masneri sp. nov. ( Figs 2 , 3 ) Holotype , ♀ : SIZK UA-1675 , Rivne Oblast , Rovno amber, late Eocene, Priabonian.Amber fragment with holotype is a triangular prism, sized 6.0: 4.5: 7.5: 1.3 mm . Diagnosis. Fore wing with costal, subcostal, basal, marginal, and stigmal veins sclerotized; radial, postmarginal, and poststigmal veins visible as traces ( Fig. 3A ); traces of radial and postmarginal veins forming closed radial cell, which is as long as marginal vein; trace of radial vein straight. Mesopleuron in lateral view with straight epicnemial carina developed throughout mesopleuron, from tegula to its ventral side ( Figs 2B, 2C , 3B ). Description. Female ( holotype ). Body length 1.3 mm ; antennae about 0.74 times as long as body; wing 0.85 times as long as body. Head. Head smooth and bare, about twice as wide as long, slightly wider than mesosoma; POL: not visible; LOL: 1; OOL: 2; ocelli large, LOL as long as diameter of lateral ocellus; eye large and bare, 2.5 times as high as malar distance; face and cheek smooth with few scattered setae; clypeus convex, transverse, 1.6 times as wide as high; epistomal sulcus distinct; tentorial pits present; mandibles elongate, narrowed to the apex, symmetrical, bidentate. Antenna. Filiform, stout; A1 cylindrical, 2.8 times as long as wide, covered with reticulate sculpture and scattered, short setae; A3 slightly shorter than A4, both about 1.35 times as long as wide, A5–A14 about 1.1 times as long as wide, A15 2.1 times as long as wide; A3–A15 covered with recumbent pubescence. Mesosoma. Pronotum coarsely rugose between epomia in dorsal view; pronotal shoulders angled; lateral side of pronotum sculptured along vertical branch of epomia and almost smooth posteriorly; mesoscutum smooth and convex; notauli complete, deep and slightly crenulate; humeral sulcus longer than tegula, not crenulate; scutellum convex, sculptured along posterior margin; anterior scutellar pit large and deep, crenulate at bottom, without median keel ( Fig. 2A ); metanotum narrow, coarsely rugose laterally; characters of metascutum invisible; propodeum in dorsal view invisible; mesopleuron with deep mesepimeral sulcus, epicnemial carina and sculpture along anterior margin; metapleuron and lateral side of propodeum coarsely rugose and with few short, scattered setae; mesopleuron in ventral view with acetabular carina behind fore-coxa and crenulate mesodiscrimen; fore tarsal claws with a row of strong setae ventrally ( Fig. 3C red arrow); mid and hind tarsal claws with few strong setae ventrally ( Fig. 3D ); fore and mid legs slender; hind tibiae gradually swollen with carina on inner side. FIGURE 2. Lubomirus masneri , holotype, female. A—head and mesosoma in dorsal view; B—face and antennae in ventral view; C—head and mesosoma in dorso-lateral view. Scale bar 0.3 mm. Metasoma. Petiole short, with elongate carinae and few scattered setae; sutures between tergites complete and deeply impressed; T2 strongly convex in lateral view, smooth, covered with few scattered setae; base of S2 sculptured, with several deep elongate grooves ( Fig. 3B ). Other metasomal characters not visible. Male. Unknown. Etymology. The new species is named in honor of Dr. Lubomir Masner.