Youtuus erythrus Gong, Yang & Chen, 2018

Chen, Xiang-Sheng & Gong, Nian, 2025, Taxonomic study of the Caliscelidae (Hemiptera: Fulgoromorpha: Fulgoroidea) from China, Zootaxa 5670 (1), pp. 1-129 : 113

Youtuus erythrus Gong, Yang & Chen, 2018

( Figures 95–97 , 98A, B )

Youtuus erythrus Gong, Yang & Chen, 2018b: 88 .

Supplementary description. Measurements. Body length including forewing: female 6.2–6.6 mm (N = 3); forewing length: female 4.8–5.3 mm (N = 3).

Female genitalia. Anal segment short and small. Abdominal sternite VII in ventral view symmetrical, posterior margin almost straight, lateral margin slightly convex. Gonapophysis VIII elongate, with four spines at apical margin. Gonapophysis IX with two symmetrical lobes, each lobe with many spines at dorsal margin. Gonoplac with outer surface shagreen; in lateral view with base half broad and large, apical half narrowed.

Host plant. Bamboo ( Figure 98C ).

Distribution. Southwestern China (Guizhou Province).

Material examined. 12♂♂ 17♀♀, China: Guizhou Province, Xishui County, Donghuang (28°33’N, 106°20’E), on bamboo, 2017-IX-27, Bin Yan, Hong-Li He and Nian Gong .

Remarks. Y. erythrus Gong, Yang & Chen, 2018 is closely related to Y. strigatus Gong, Yang & Chen, 2018 , but differs in: 1) body mainly orange-red to red (brown to dark brown in Y. strigatus ); 2) male pygofer in posterior view without pair of processes (with pair of processes in Y. strigatus ); 3) lateral margin of anal segment bearing verruciform process at basal third (at basal half in Y. strigatus ).

Figures

FIGURE 95. Youtuus erythrus Gong, Yang & Chen, 2018 A. Male habitus, dorsal view; B. Male habitus, lateral view; C. Female habitus, dorsal view; D. Female habitus, lateral view. Scale bars: 0.5 mm (A–D).

FIGURE 96. Youtuus erythrus Gong, Yang & Chen, 2018 Male: A. Head and thorax, dorsal view; B. Face; C. Head and thorax, lateral view; D. Forewing; E. Hindwing; F.Anal segment, dorsal view; G. Male genitalia, lateral view; H. Pygofer, posterior view; I. Genital styles, posterior view; J. Pygofer and genital styles, ventral view; K. Aedeagus, lateral view; L. Aedeagus, dorsal view. Scale bars: 2 mm (D, E); 1 mm (G); 0.5 mm (A–C, F, H–L).

FIGURE 97. Youtuus erythrus Gong, Yang & Chen, 2018 Female: A. Genitalia, lateral view; B. Genitalia, ventral view; C.Anal segment, dorsal view; D. Abdominal sternite VII, ventral view; E. Gonapophysis VIII, lateral view; F. Gonapophysis IX, lateral view. Scale bars: 0.5 mm (A, B, D); 0.2 mm (C, E, F).

FIGURE 98. Habitat of Youtuus erythrus Gong, Yang & Chen, 2018 A, B. Living adult; C. General environment and host plant. 22 Oct. 2022, Dongfeng Lake Wetland Park, Xishui County, Guizhou Province, photograph by Xiang-Sheng Chen.