Plumalexius Brothers, 2011

Brothers, Denis J. & Melo, Gabriel A. R., 2021, Re-evaluation of the Cretaceous family Plumalexiidae and its relationships (Hymenoptera: Chrysidoidea), Palaeoentomology 4 (6), pp. 584-591 : 585

Genus Plumalexius Brothers, 2011

Type species. Plumalexius rasnitsyni Brothers, 2011

Diagnosis. Male. Compound eye oval with convex inner margin, lacking pores and setae; antenna with many long fine erect setae closely and evenly spaced on pedicel and all flagellomeres; occipital carina present; mandible with three (or possibly four) apical teeth along truncate apical margin; maxillary palp 4-segmented; labial palp 2-segmented. Pronotum much shorter than mesoscutum, with slight anterior collar (flange) and posteroventral angle rounded; mesoscutum transverse; notauli distinct, complete, diverging anteriorly; tegula small, convex; metapostnotum with posterior margin obliterated, apparently about as long as metanotum; propodeum long, weakly constricted apically; propleura closely associated dorsally but not fused; meso-metapleural suture straight. Hind wing with two closed cells, costal vein present only basally, anal (vannal/plical) lobe less than half length of wing. Tibiae without spines or strong setae; tibial spurs 1– 2–2; basitarsomeres much longer than other tarsomeres; arolia large; claws ventrally toothed. Metasoma ovoid, sessile basally, apical tergum simple, seventh sternum reduced, hypopygium simple with convex apex.

Remarks. The diagnosis above is an update of the original ( Brothers, 2011) resulting from the investigations reported below.