Crassibethylus, Barbosa & Melo, 2023

Barbosa, Diego N. & Melo, Gabriel A. R., 2023, Revision of Bethylinae from Dominican amber, with description of a new genus (Hymenoptera, Bethylidae), Journal of Hymenoptera Research 96, pp. 167-180 : 167

† Crassibethylus gen. nov.

Figs 2 , 3

Type species.

† Crassibethylus dominicanus sp. nov.

Diagnosis.

Maxillary palp with four articles; prosternum shorter than area of procoxa; pro- and metafemora strongly swollen, profemur lenticular-shaped, about 0.6 × as wide as long; posterior margin of pronotum slightly produced backward medially; mesoscutellar groove present as a narrow sulcus; forewing vein 2Cu present; insertion of metacoxae displaced anteriorly between mesocoxal insertion; ventral carina of metasomal petiole straight.

Description.

Female. Head. Head as long as wide; antenna with 11 flagellomeres; clypeus with median clypeal carina continuous with frontal carina, lateral lobe not evident; anterior margin of frons projected anteriorly. Eye large, occupying most of lateral portion of head. Ocelli located close to vertex crest; anterior angle of ocellar triangle obtuse. Vertex straight. Mesosoma. Pronotum with dorsal pronotal area longer than mesoscutum, its posterior margin slightly produced backward medially. Mesoscutum without notaulus; parapsidal signum absent. Mesoscutellar groove as a narrow sulcus, lacking enlarged lateral pits. Metapectal-propodeal complex coriaceous; metapostnotum indistinct, apparently without metapostnotal median carina and metapostnotal-propodeal suture; posterior transverse carina present. Mesopleuron somewhat swollen in dorsal view, coriaceous, not sculptured; mesopleural pit shallow. Prosternum relatively large, somewhat rhombic-shape. Wings. Forewing with costal cell conspicuous; second radial cell closed, short, almost triangular; length of vein Rs2 as long as vein M2; length of vein Rs2+M2 as long as vein 1Rs2; stigma well developed, bula present. Legs. Pro- and metafemora strongly swollen, profemur lenticular-shaped, about 0.6 × as wide as long. Insertion of metacoxae displaced anteriorly between mesocoxal insertion. Tarsal claws strongly curved, with a large basal expansion. Metasoma. Sting with 3vv narrow and long.

Etymology.

The genus name is an allusion to the strongly swollen profemora, from Latin crassus, thick, fat, stout, and Bethylus , the type genus of Bethylinae .

Figures

Figure 2. † Crassibethylus dominicanus gen. et sp. nov. Female holotype A dorsal habitus B lateral habitus C head and mesosoma, in dorsal view D wings and metasoma, in frontal view. Scale bars: 1 mm (A); 0.2 mm (C); 0.5 mm (D). A, B at same scale.

Figure 3. † Crassibethylus dominicanus gen. et sp. nov. Female holotype A head, in frontal view B mesosoma, in lateroventral view C head and mesosoma, in dorsal view D head and protorax, in lateroventral view. Scale bars: 0.5 mm (A); 0.2 mm (D). A-C at same scale.