Neostethynium, Ogloblin, 1964

Huber, John T., Read, Jennifer D. & Triapitsyn, Serguei V., 2020, Illustrated key to genera and catalogue of Mymaridae (Hymenoptera) in America north of Mexico, Zootaxa 4773 (3), pp. 1-411 : 251

NEOSTETHYNIUM Ogloblin, 1964

( Figs 659–676 )

Stethynium (Neostethynium) Ogloblin, 1964: 106 . Type species: Stethynium (Neostethynium) stenopterum Ogloblin, 1964 , by original designation. Raised to genus by Huber, 1987: 827 and Yoshimoto, 1990: 45.

Diagnosis. Head in lateral view with vertex almost horizontal and forming a right angle with posterior surface of head ( Fig. 659 ); face with faint subantennal sulci ( Fig. 660 ); clava 3-segmented, the segments separated by transverse sutures ( Figs 659 , 665 ); mandibles small, their apices not touching when closed ( Figs 660, 661 ); ocelli forming an equilateral triangle ( Fig. 663a ); scutellum with 1 posterolateral seta and with campaniform sensilla abutting ( Fig. 666 ); frenum entire ( Fig. 666 ); genitalia at base with a dark reddish colour ( Figs 669, 671 ). Male mandibles large, crossing when closed, each with 2 equal ventral teeth and a dorsal serrate apically rounded tooth ( Fig. 672, 673 ).

Discussion. Neostethynium is one of three Nearctic genera with clava 3-segmented. It differs from Krokella by having fore wing narrow, venation shorter than half length of wing, and frenum entire. It differs from Stethynium by the mandibles; in Stethynium the mandibles in both sexes have 4 equal teeth.

Important reference. Ogloblin (1964).

Figures

FIGURE 659. Neostethynium americanum Huber, paratype habitus. USA, South Carolina, Pickens Co., Clemson, Cherry’s Crossing, 26.v–29.vi.1987, near lakeshore, J. Johnson. Scale bar=500 μm.

FIGURES 660–664. Neostethynium americanum Huber, paratype head except 664. 660, anterior; 661; posterior; 662a, lateral; 662b, lateral (internal) showing ocular apodeme; 663a, dorsal; 663b, mouthparts; 664, wings. Scale bars=100 μm.

FIGURES 665–667. Neostethynium americanum Huber, paratype. 665, antenna; 666, mesosoma, dorsal; 667, mesosoma, lateral. Scale bars=100 μm.

FIGURES 668–671. Neostethynium americanum Huber, paratype except 670. 668, metasoma, dorsal; 669, metasoma, showing genitalia through gaster; 670, holotype slide; 671, metasoma, lateral. Scale bars=100 μm.

FIGURES 672–676. Neostethynium americanum Huber, paratype male. 672, head, anterior; 673, head, posterior; 674, antenna; 675, metasoma, dorsal; 676, metasoma showing genitalia through gaster. Scale bars=100 μm.