Rhoenanthus youi ( Wu et You, 1986 )

Han, Na, Zhang, Min & Zhou, Chang-Fa, 2021, The genus Rhoenanthus Eaton, 1881 in China with the redescription of R hunanensis You & Gui, 1995 (Ephemeroptera: Potamanthidae), Zootaxa 4903 (4), pp. 563-577 : 573-574

Rhoenanthus youi ( Wu et You, 1986)

Figs 6 E–F, 10D–F, 11

Neopotamanthus youi Wu & You, 1986: 401 , (male, female, subimago, nymph, Figs 1 –20). Types: male, female, Anhui Province, central China .

Neopotamanthus youi: Gui 1985: 91 (based on submission of Wu & You 1986); Wu et al. 1991: 111 (egg); You & Gui 1995: 117, Fig. 124 (male, female, partial).

Rhoenanthus (Potamanthindus) youi: Bae & McCafferty 1991: 28 , Figs 2 , 87, 106, 123, 137 (male, female, nymph).

Rhoenanthus youi: Kluge 2004: 223 .

Diagnosis: Nymph of this species can be distinguished by round mandibular tusks with spines on whole base and lateral margins ( Fig. 10D ). Forewing of adults with some reddish pigments on median but brownish in other place. Genital pore of male imagoes on the dorsal of penis, and penes shallowly forked apically ( Fig. 6 E–F). Female subgenital plate brown, expand to middle sternum VIII; lateral margin of terga VIII and IX extended into obvious lobes; subanal plate concave.

Distribution: China (Guizhou, Anhui, Henan, Beijing, Shanxi, Shaanxi, Fig. 11 ).

Materials examined: Holotype ♂, Paratypes 5L, Zhufoan town , Huoshan County, Anhui Province, China, collected by Xingyong WU, VI-1984 ; 6♀♀ 30 L, Tiantang village , Jinzhai County, An-Hui Province, China, collected by Dong Liu & Changfa ZHOU, VIII- 2006 ; 1♀, Hongxing village , Ankang county, Shaanxi Province, China, collected by Haili YU, VII- 2003 ; 1♀ 24 L, Qingbaikou village , Mentougou, Beijing, China, collected by Changfa ZHOU, IX- 1994 ; 1♂ 2♀♀ 30 L, jointing point of Baihe river and Heihe river, Yanqing county, Beijing, China, Zhenxing MA and Wei ZHANG, 7- VIII- 2017 ; 13 L, Honghong Village , Lishan Mountain Nature Reserve , Lishan Town, Yuanqu County, Shanxi Province, China, collected by Dong LIU & Zhaofeng WANG, 3- VII- 2003 ; 3 L, Huanglianshu Village , Jiyuan County, Henan Province, China, collected by Haili YU, 7-VI-2000 ; 2♂♂ subimagoes, 1♀, Jinshan Village , Guiding County, Guizhou Province, China, collected by Jiachang QIN, 15- VII- 2009 .

Figures

FIGURE 1. Female imago of Rhoenanthus coreanus (digital photos).

FIGURE 2. Nymphal characters of Rhoenanthus hunanensis (digital photos).A. Habitus in dorsal view; B. Head and pronotum of another more mature nymph (dorsal view, showing mandibular tusks); C. Enlarged section of the antenna.

FIGURE 6. Male structures of Rhoenanthus spp. (digital photos). A–D. Rhoenanthus hunanensis; E–F. Rhoenanthus youi: A. Forewing; B. Hindwing; C, F. Genitalia (dorsal view); D–E. Enlarged penes (ventral view).

FIGURE 10. Selected structures of Rhoenanthus spp. (digital photos). A–C. R. sapa; D–F. R. youi; G–I. R. obscurus: A, D, G. Anterior part of body (showing the relatively length of mandibular tusks, forelegs and their setae); B, E, H. Maxilla (dorsal view); C, F, I. Labrum (ventral view).

FIGURE 11. Chinese Rhoenanthus species distribution map.