Gonatocerus Nees 1834

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).