Plumalexiidae 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

Family Plumalexiidae Brothers, 2011

Type genus. Plumalexius Brothers, 2011

Diagnosis. Male. Antenna 13-segmented. Pronotum forming a short convex band reaching tegula; propleura closely associated, anterodorsally exposed as a short neck, posteriorly swollen and transversely truncate to shallowly indented mesad; prosternum short and scarcely to briefly exposed medially; mesopleuron large and swollen, prepectus very well developed, broad and nearing midline, entirely articulating ( Fig. 2B ); metapleuron with endophragmal pit anteriorly placed, sulcus acutely extended ventral to pit; metasternum somewhat depressed anteriorly; metacoxal cavities open. Fore wing with pterostigma very large, seven closed cells (costal, basal, subbasal, marginal, first and second submarginals, first discal), second submarginal cell with long anterior margin, veins not quite reaching apical margin, no accessory veins in apical membrane. Hind wing with closed cells (basal and subbasal at least), anal (vannal/plical) lobe well developed; jugal lobe absent. Coxae subglobose, trochanters inserted apically. Metasoma with tergum I anteriorly narrowed and fused with sternum I basally. Genitalia with parameres broad and concave.

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

Figures

FIGURE 2. Plumalexius ohmkuhnlei Rasnitsyn & Brothers, males. A, DZUP Bur-416, habitus, antero-ventral view. B, DZUP Bur-416, head and mesosoma, pp = prepectus. C, DZUP Bur-1126a, metasomal apex, dorsal view. D, DZUP Bur-1030, tarsal apex. E, Holotype, tarsal apex. Scales differ.