Disogmus Foerster

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 : 455-456

Genus Disogmus Foerster

Disogmus Förster, 1856: 99. Type species: Proctotrupes areolator Haliday, designated by Walker (1874), Ashmead (1893). Key to species.

Diagnosis.

Front wing 1.8-3.5 mm, long. Body moderately slender. Head clearly transverse, rounded, frons convex. Apical margin of clypeus simple and convex. Mandible moderately stout, with a single point. Cheeks usually with sulcus from eye to mandible. Occipital carina developed, but not reaching hypostomal sulcus. Male flagellum with noticeable tyloids. Pronotum with strong angular pronotal shoulder that is surmounted by a sharp carina. Epomia present. Scutellar pit without inner longitudinal carinae. Notaulus varying from about 0.5 as long as tegula to quite long and reaching beyond center of mesoscutum. Horizontal mesopleural groove complete and strong. Stigma small, r-rs (vertical part of radius) about 3.0 times as long as wide, radial vein runs from apical 0.3 of stigma. Radial cell long, the side next to costa about 2.8 times as long as depth of stigma. Hind spur is equal to 0.3 of the length of basitarsus or even shorter. Abdomen with stalk about 1.2 times as long as high. Ovipositor sheath 0.7-0.9 times as long as hind tibia, smooth, slender, evenly curved, gradually tapered to a rounded apex, with some erect hairs that are denser near apex.

Distribution.

This small genus comprises 5 described species, 3 species of which inhabit the Holarctic and the other 2 species occur only in the Nearctic ( Townes 1981, Buhl 1998). Moreover, we have found this genus in Mexico and Taiwan. The specimens of this genus presumably parasitize the larvae of Sciaridae ( Sciaroidea , Diptera ) ( Townes 1981). Sciarids are overrepresented in Rovno amber in comparison with Baltic amber ( Perkovsky et al. 2007).