Bayadera bidentata Needham, 1930

Phan, Quoc Toan, Kompier, Tom, Karube, Haruki & Hayashi, Fumio, 2018, A synopsis of the Euphaeidae (Odonata: Zygoptera) of Vietnam, with descriptions of two new species of Euphaea, Zootaxa 4375 (2), pp. 151-190 : 157-158

Bayadera bidentata Needham, 1930

( Fig. 4a–h )

Bayadera bidentata: Needham (1930) , p. 218, pl. r6, Fig. 7 ; Asahina (1956), p. 207, Fig. 4 ; Sui & Sun (1984), pp. 209–211; Davies & Tobin (1984), pp. 22–23; Wilson & Reels (2003), p. 249, Fig. 13 ; Hämäläinen (2004), p. 388; Do & Dang (2007), p. 31, distribution map [Specimens from Mt Pia Oac, Cao Bang Prov. and Tam Dao National Park, Vinh Phuc Prov.; first record from Vietnam]; Wilson & Zaifu (2007), pp. 99–101, 120, Fig. 4 ; Zhang (2010), p. 25 (species list).

Materials examined. [ Vietnam] 1♂ 1♀, Xuan Son National Park , Phu Tho Prov., 30.V.2015, T. Kompier leg.

(TKC); 1♂, Tam Dao National Park , Vinh Phuc Prov. , 18.V.2014, T. Kompier leg. (TKC). [ China] 1♀, Zhizhiqu , Zhuangzu , Guangxi Prov. , 2–4.VI.2004, H. Karube leg. ( KPM); 1♀, Nanling, Guandong Prov. , 22–26.VII.2004, Y. Kishida leg. ( KPM); 1♀, Nanling, Guandong Prov., 30.VI.2010, Z. Haomiao leg. ( KPM); 5♂ 5♀, Damingshan, Guangxi Prov., 6–7.VI.2014, F. Hayashi leg. (FHC).

Notes. Male Bayadera bidentata is characterized by an entirely blackish thorax and abdomen ( Fig. 4a ), the lower half of the thorax extensively covered with grey pruinosity in life. Wings are hyaline, very faintly tinged yellow from the base to the level of pterostigma ( Fig. 4e ). Cerci have large spines and two prominent tubercles on inner sides ( Fig. 4b–d ). Yellow markings of the female thorax vary from the relatively poorly marked type in Guangdong Province, China ( Fig. 4f ), to the more extensively marked types in Guangxi Province, China and northern Vietnam ( Fig. 4g ). The tip of female abdomen has one distinct oval spot laterodorsally on S9 ( Fig. 4h ).

Distribution. Vietnam (Cao Bang [ Do & Dang 2007], Phu Tho and Vinh Phuc Provinces), China (Zhejiang, Fujian, Guangdong, Hubei, Guangxi and Sichuan Provinces) ( Wilson & Reels 2003, Hämäläinen 2004).

Figures

FIGURE 4. Bayadera bidentata. [3a–e] ♂, Tam Dao and [4f–h] ♀. (4a) head and thorax; (4b) appendages, dorsal view; (4c) appendages, ventral view; (4d) appendages, lateral view; (4e) wings; (4f) head and thorax, Guangdong, China; (4g) head and thorax, Guangxi, China, and Vietnam; (4h) abdominal tip.

FIGURE 7. Bayadera hyalina. [7a–f] ♂ and ♀, Yen Bai and [7g–h] ♂ and ♀, Yunnan. (7a) male head and thorax; (7b) appendages, dorsal view, (7c) appendages, lateral view; (7d) appendages, ventral view; (7e) male wings; (7f) female head and thorax; (7g) male head and thorax; (7h) female head and thorax.

FIGURE13.Euphaea decorata.(13a)♂,Pia Oac Nature Reserve,Cao Bang Province; (13b)♀, Mau Son mountain,Lang Son Province (photographed by Q.T.Phan).