Gonatocerus, Nees, 1834

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 : 184

GONATOCERUS Nees, 1834

( Figs 452–466 )

Gonatocerus Nees, 1834: 192 . Type species: Gonatocerus longicornis Nees, 1834 , by monotypy.

Diagnosis. Body length 640–1665 μm. Funicle with fu 2 and fu 3 usually the longest segment and often fu 2 with apex slightly oblique ( Fig. 457 ); fore wing relatively narrow and as setose behind venation as beyond venation, with the microtrichia fairly dense ( Figs 452 , 464 ); stigmal vein with apex oblique ( Fig. 464 ); dorsellum rhomboidal ( Fig. 458 ), often with margins slightly lighter in colour laterally than medially; propodeum without submedian carinae ( Fig. 458 ), but sometimes with faint converging sulci.

Discussion. Among the four genera in the Gonatocerus group ( Cosmocomoidea , Gastrogonatocerus, Gonatocerus , and Lymaenon ) that share the following combination of features: tarsi 5-segmented, funicle 8-segmented, face with subantennal sulci, and parastigma with hypochaeta about midway between proximal and distal macrochaetae ( Huber 2015a), Gonatocerus is superficially most similar to Lymaenon , but the pronotal lobes abut medially and the dorsellum is triangular as in Cosmocomoidea and Gastrogonatocerus but in contrast to Lymaenon .

Nearctic hosts. Hemiptera : Cicadellidae .

Important references. Girault (1929 [428]), Huber (1988, 2015a, 2017), Triapitsyn et al. (2010), Triapitsyn (2013a, b).

Figures

FIGURE 452. Gonatocerus rivalis Girault, habitus. Canada, Ontario, Buckham’s Bay West, 45°29'36"N 76°6'38"W, v–x.2010, J. Read. Scale bar=500 μm.

FIGURES 453–457. Gonatocerus sp. 453, head, anterior; 454, head, posterior; 455a, head, lateral; 455b, head, lateral (internal) showing ocular apodeme; 456; head, dorsal; 457, antenna. Scale bars=100 μm.

FIGURES 458, 459. Gonatocerus sp., mesosoma. 458, dorsal; 459, lateral. Scale bars=200 μm.

FIGURES 460–462. Gonatocerus sp., metasoma. 460, dorsal; 461, lateral; 462, ventral. Scale bars=200 μm.

FIGURES 463–465. Gonatocerus sp., male. 463, antenna; 464, wings; 465a, metasoma, dorsal; 465b, genitalia seen through gaster. Scale bars=200 μm.

FIGURE 466. Gonatocerus sp., male, metasoma. 466a, lateral; 466b, lateral showing genitalia. Scale bars=200 μm.