Youtuus Chen & Gong

Gong, Nian, Yang, Lin & Chen, Xiang-Sheng, 2018, Youtuus, a new bamboo-feeding genus of the tribe Augilini with two new species from China (Hemiptera, Fulgoromorpha, Caliscelidae), ZooKeys 783, pp. 85-96 : 86

Youtuus Chen & Gong gen. n. Figs 1-8, 9-20, 21-32

Type species.

Youtuus erythrus Gong, Yang & Chen, sp. n.

Diagnosis. Description. Head (Figs 9, 21) with eyes as wide as pronotum. Vertex with anterior margin slightly convex, posterior margin slightly concave, lateral margins subparallel, disc depressed. Frons (Figs 10, 22) with median and lateral carinae distinct, sublateral carinae complete or basal 1/2 obsolete, widest at level of second segment of antennae. Clypeus (Figs 10, 22) with lateral carinae distinct. Pronotum (Figs 9, 21) with anterior margin roundly convex, posterior margin broadly concave, with two lateral carinae, disc with two pits slightly sank. Mesonotum (Figs 9, 21) with median carina obscure, lateral carinae weak and subparallel. Forewing (Figs 12, 24) subhyaline, relatively narrow, parallel-sided; veins distinct, claval suture present. Hindwing (Figs 13, 25) hyaline, with three lobes, longer than half length of forewing. Legs relatively long, hind tibia with a single lateral tooth; spinal formula of hind leg 8 –2– 2. Abdomen elongate, narrowly cylindrical, with anterior and posterior margins of terga and sterna respectively transverse and chevron-like.

Male genitalia. Anal segment (Figs 14-15, 26-27) with lateral margin bearing verruciform process, ventral margin with its apical third with a row of micro brush-like bristles and 8-14 large bristles apically. Pygofer in lateral view (Figs 15, 27) with dorsal half much narrower than ventral half. Genital style (Figs 15, 18, 27, 30) longer than width. Penis (Figs 15, 19-20, 27, 31-32) extending beyond anterior margin of pygofer basally, with phallobase degenerated and obviously membranous; in lateral view with a ring structure near base of phallobase, thence apically branched one longer median and two shorter lateral processes respectively, the median one with apical half ventrally reflexed, directed basally, apex bent.

Remarks.

The new genus seems very closely related to Pseudosymplanella , but can be distinguished from the latter by: 1) frons not visible in dorsal view (frons visible in dorsal view in Pseudosymplanella ); 2) male anal segment with lateral margin with a verruciform process, ventral margin with apical third bearing a row of micro brush-like bristles and 8-14 large bristles apically (without verruciform process and any bristles in Pseudosymplanella ); 3) posterior margin of male pygofer in lateral view without a spine-like process (with a spine-like process in Pseudosymplanella ). According to the structute and venation of hind wing the new genus close to Madagascan Cano Gnezdilov, 2011.

Etymology.

The name is derived from transliteration of the Chinese “you-tu”, meaning the anal segment with verruciform processes. It is masculine in gender.

Host plant.

Bamboo (Figs 33-34).

Distribution.

Southwestern China (Guizhou).