Rhoenanthus obscurus Navás, 1922

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

Rhoenanthus obscurus Navás, 1922

Figs 10 G–I, 11

Rhoenanthus obscurus Navás, 1922: 58 (adults, Vietnam).

Potamanthindus auratus Lestage, 1931: 123 (female, Vietnam, synonymized by Bae and McCafferty 1991: 24).

Potamanthus sp. TPA Gose, 1969: 125 (nymph, attributed by Bae & McCafferty 1991: 24).

Rhoenanthus (Potamanthindus) obscurus: Bae and McCafferty 1991: 24 (all stages, Thailand).

Rhoenanthus obscurus: Kluge 2004: 223 .

Rhoenanthus (Potamanthindus) obscurus: Nguyen & Bae 2004: 9 ; Nguyen & Bae 2006: 22.

Diagnosis: Nymphs of Rhoenanthus obscurus can be distinguished from other species of the subgenus by strongly convergent and abruptly curved mandibular tusks, and apical 3/5 parts of them brown, smooth but basal 2/5 pale and with spines ( Fig. 10G ). The penes of male are relatively shorter than other congeners.

Distribution: Vietnam, Thailand, China (Yunnan, first record for China, Fig. 11 ).

Materials examined: 3♀♀, Menglun Botanical Garden , Mengla County; 6 L, Puwen town , Puer County ; 3L, Fengshan town , Jinggu County, Yunnan Province, China, collected by Changfa ZHOU, IV- 2001 ; 1L, Huiji , Mengla County, Yunnan Province, China, collected by Jie ZHANG, 8-III-2013 ; 6 L Nagong Dam, Puwen Town , Jinghong City, Yunnan Province, China, collected by Ning DING, 1- IV- 2013 ; 8 L Tiaobahe Village, Mengyang Town , Jinghong City, Yunnan Province, China, collected by Ning DING, 27-III-2013 ; 1L, Mengyuandong , Mengla County, Yunnan Province, China, collected by Yunlei ZHOU, 14-III-2013 .

Figures

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.