Bayadera continentalis Asahina, 1973

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 : 158-160

Bayadera continentalis Asahina, 1973

( Fig. 5a–h )

Bayadera brevicauda continentalis: Asahina (1973) , pp. 455–457, Figs 44–49; Asahina (1978), p. 45, Fig. 6 ; Chao (1981), p. 23; Davies & Tobin (1984), pp. 22–23; Wilson & Reels (2003), p. 250.

Bayadera continentalis: Hämäläinen (2004) , pp. 388–391, Fig. 10 ; Wilson & Zaifu (2007), pp. 101, 120. Zhang (2010), p. 25 (species list).

Materials examined. [ Vietnam] 1♂, Pia Oac Nature Reserve , Cao Bang Prov., 22–24.V.2010, H. Karube leg. ( KPM) ; 2♂ 2♀, Pia Oac Nature Reserve , Cao Bang Prov., 16–20.V.2015, Q. T. Phan and T. Kompier leg. ( PQTC) ; 2♂, Pia Oac Nature Reserve , Cao Bang Prov., 1.V.2015, T. Kompier leg. (TKC) ; 2♂ 1♀, Dong Van , Ha Giang Prov., 2.V.2011, F. Hayashi leg. (FHC) ; 1♂, Tam Dao National Park , Vinh Phuc Prov., 24.IV.2016, T. Kompier leg. (TKC). [ China] ♂ holotype , 1.V.1946, and ♀ allotype, 6.V.1946, Kuatun, Fukien, Asahina’s leg. (NSMT); 1♂, Shaoguan, Nanling Reserve , Guangdong Prov., 21.V.2009 and 2♂, same location , 9.VI.2011, H. Zhang leg. (KPM); 1♂ 1♀, Cenwanglaoshan , Guangxi Prov., 18.V.2016, F. Hayashi leg. (FHC).

Other materials confirmed by field observations. [ Vietnam] 3♂, Tam Dao, Vinh Phuc Prov., 8.V.2016, T. Kompier; 2 exs, Tam Dao, Vinh Phuc Prov., 1.V.2017, T. Kompier.

Notes. This species is recorded from Vietnam for the first time. The specimens from Dong Van match the original description ( Asahina 1973) well, especially by having the heart-shaped yellow marking straddling the metepisternum and metepimeron of synthorax ( Fig. 5a, d ). Hämäläinen (2004) upgraded Bayadera continentalis from subspecies to species level, because there are clear differences in the colour pattern and structure of anal appendages. In Bayadera continentalis paraprocts are only narrowly separated in dorsal view, while those of B. brevicauda are more widely spaced. However, males from Pia Oac Nature Reserve of northern Vietnam and from Guangdong Prov. of southern China differed slightly from the type specimens of Bayadera continentalis by having a very dark synthorax with the marking on metepisternum reduced into a narrow stripe ( Fig. 5e ); paraprocts of the specimens from Dong Van ( Vietnam) and Guangxi ( China) are more closely spaced as in the original description ( Fig. 5b–c ) although the paraprocts of the specimens from Pia Oac are separated further, but the deep incision of S10 and the shape of the cerci with strongly curved apex supports identification as B. continentalis ( Fig. 5f ). In the specimens of Dong Van and Guangdong, labrum, mandibles, genae, and color of the dorsal head markings are yellowish, but bluish in the males from Pia Oac Mountain. Wings of the specimens from Guangdong and Dong Van are hyaline, but slightly darkened at tip in males from Pia Oac ( Fig. 5h ).

Distribution. Vietnam (Ha Giang, Cao Bang and Vinh Phuc Provinces), China (Zhejiang, Fujian, Hunan, Guangdong and Guangxi Provinces) ( Wilson & Reels 2003, Hämäläinen 2004, Wilson & Zaifu 2007).

Figures

FIGURE 5. Bayadera continentalis. [5a–d] ♂ and ♀, Dong Van and [5e–h] ♂, Pia Oac. (5a) male head and thorax; (5b) appendages, dorsal view; (5c) appendages, lateral view; (5d) female head and thorax; (5e) male head and thorax; (5f) appendages, dorsal view; (5g) appendages, lateral view; (5h) wings.

FIGURE 6. Bayadera hatvan. [6a–d] ♂ and [6e] ♀, Pia Oac. (6a) head and thorax; (6b) appendages, dorsal view; (6c) appendages, ventral view; (6d) wings; (6e) head and thorax.

FIGURE 10. Bayadera serrata. [10a–e] ♂ and [10f–i] ♀. (10a) head and thorax; (10b) head, oblique-dorsal view; (10c) appendages, dorsal view; (10d) appendages, lateral view; (10e) appendages, ventral view; (10f) head and thorax; (10g) head, antero-dorsal view; (10h) abdominal tip; (10i) wings.