Bayadera hyalina : Selys (1879) A synopsis of the Euphaeidae (Odonata: Zygoptera) of Vietnam, with descriptions of two new species of Euphaea Phan, Quoc Toan Kompier, Tom Karube, Haruki Hayashi, Fumio Zootaxa 2018 2018-01-24 4375 2 151 190 L4NS Selys, 1879 : Selys 1879 [151,509,151,178] Insecta Euphaeidae Bayadera GBIF Animalia Odonata 10 161 Arthropoda species hyalina    Bayadera hyalina: Selys (1879), p. 27; Needham (1909), p. 191; Laidlaw (1917), p. 31; Fraser (1928), pp. 52–53, Fig. 5; Fraser (1934), p. 81; Lahiri (1975), p. 255; Davies & Tobin (1984), pp. 22–23; Lahiri (1987), pp. 37–38, Figs 81–82, 117–118; Donnelly (1994), p. 86; Hämäläinen & Pinratana (1999), p.8; Hämäläinen (2017), p. 9; Zhang (2017), 45 (species list).     Materialsexamined.[ Vietnam] 1♂, Tu Le, Yen BaiProv.,  25.V.2015, T. Kompierleg. (TKC);  1♂ 1♀, Tu Le, Yen BaiProv.,  30.VI.2015, T. Kompierleg. (TKC);  1♂, Tu Le, Yen BaiProv.,  11.V.2014, T. Kompierleg. (TKC);  1♂, Tu Le, Yen BaiProv.,  11.VII.2015, T. Kompierleg. (TKC);  1♂, Tu Le, Yen BaiProv.,  16.IX.2015, Q.T. Phanleg. ( PQTC);  1♂, Lai ChauProv.,  17.IV.2014, T. Kompierleg. (TKC);  1♂, Hoang Lien Son, Lao CaiProv.,  23.VI.2015, T. Kompierleg. (TKC);  1♂, Lai ChauProv.,  28.V.2017, T. Kompierleg. (TKC);  3♂, Ch'Om, Tay Giang District, Quang Nam Prov.,  18.IX.2016, V.Q. Toleg. ( PQTC). [ China] 1♂ 1♀, Yangbijiang River, Yangbi County, Dali, YunnanProv.,  12.VI.2013, H. Zhangleg. (KMP);  1♂, Xiangzhigou, Xinpuxiang Village, Guiyang City, GuizhouProv.,  28.VIII.2012, H. Zhangleg. (KMP). [ Laos] 3♂, N.  Sekong,  5.VII.2011, T. Miyashitaleg. ( KPM).    Othermaterials confirmed by field observations.[ Vietnam] Someindividuals, Hoang Lien Son, Lao Cai Prov.,  VII 2014, VI 2015, T. Kompier; Someindividuals, Yen BaiProv,.   VI.2014, VI, VII, VIII, X 2015, VII 2016, T. Kompier; 6 exs, Cao Bang Prov.,  18.VI.2015, T. Kompier; Some individuals, Bach Ma, Thua Thien-Hue Prov.,  5–8.VIII.2016, T. Kompier.  Notes.This species, preliminarily identified as  Bayadera hyalina, is recorded from Vietnamand Laosfor the first time. The identification of published or unpublished ‘  Bayadera hyalina’ material collected outside the typelocality of  hyalina(Khasia Hills, Meghalaya, India), such as those from Thailand, Laos, Vietnamand China( Yunnanand Guizhou), remains uncertain until the material can be directly compared with topotypical Indian material.  Selys (1879)described  Bayadera hyalinabased on a single incomplete male from ‘Khasia Hills, Assam’ (in the present MeghalayaState, India); this holotypelacks abdominal segments S7–10 including appendages. Later, Fraser (1928, 1934) redescribed males and females based on several specimens from its typelocality and noted and illustrated that the cerci have large spines near the base, but lack tubercles. However, Lahiri (1987)reported “presence of a small but prominent median tubercle on inner surface of superior anal appendages” in the specimens from Shillong, close to the typelocality. Confusingly the position of the interior spine in cerci differs considerably in the rather crude illustrations presented by Fraser and Lahiri. The materials from Vietnam, Laosand China( Guizhou) used in this study have these characteristics and we identified these materials all as  Bayadera hyalina, although we could not examine the holotypeor materials from the typelocality. A similar species,  Bayadera strigata Davies & Yang, 1996, was described from Dali, Yunnan, southern China. Although we could not examine the typespecimens of this species, we examined a pair of specimens obtained from its typelocality, Dali, Yunnan. The structure of anal appendages of these specimens considered to be  Bayadera strigataresembles that of  B. hyalinafrom Vietnam, Laos, and China( Guizhou) with cerci having robust spines near the base, and 1–2 small tubercles in addition. Thoracic pattern of the supposed  Bayadera hyalina( sensu lato; including  B. strigata) varies geographically. Male prothorax is entirely black in central Vietnam, Laosand China( Guizhou), excluding two tiny spots on the margin of the posterior lobe of Chinese specimens, but prothorax has two yellow spots on the median lobes in northern Vietnam( Fig. 7a, f) and is even more prominently marked in Yunnan( China) ( Fig. 7g–h). Laotian specimens lack humeral stripe on male synthorax. This stripe is reduced to two oval spots at anterior margin of male synthorax in Guizhou( China), and well defined as humeral stripes in northern Vietnamand Yunnan( China) ( Fig. 7a, f–h). Cerci of Laotian and Chinese specimens have two small tubercles besides the basal large spine, but those of Vietnamese specimens have only one typical tubercle ( Fig. 7b–d). Thoracic pattern of the female from Yunnan( China) is well defined with robust stripes ( Fig. 7h), but it less clearly defined with only narrow stripes in the female from Vietnam( Fig. 7f). Wings of all specimens are hyaline, excluding two males from Yen Bai Provinceand many males from Guizhou, China, that have distinct apical darkening from the apical end of pterostigma to the wing border as shown in Figure 7e.  Donnelly (1994)recorded four males of  Bayadera( cf. hyalina) from Doi Inthanon, Chiang Mai, Thailand, with a brief note that "this species is not longicauda, […,] the appendages have the superior with the sharp ventral basal spine and curvature resembling Fraser’s figure". Later, Hämäläinen & Pinratana (1999)and Hämäläinen (2017)identified the Thai specimens as  Bayadera hyalina.   Distribution. Vietnam( Lai Chau, Lao Cai, Yen Bai, Cao Bang, Quang Nam, Thua Thien-Hueand Lam Dong[Hämäläinen in litt.] Provinces), China( Yunnanand GuizhouProvinces), Laos( Sekong Province), Thailand( Chiang Maiand LoeiProvinces) ( Hämäläinen 2017), India( Meghalayaand West BengalStates) ( Fraser 1934, Lahiri 1987). 1805097982 [151,1209,1485,1510] 2015-05-25 T. Kompier Vietnam Tu Le Materials 10 161 1 1 Yen Bai 1805097992 2015-06-30 T. Kompier Vietnam Tu Le 10 161 2 1 1 Yen Bai 1805097998 [688,1382,1522,1547] 2014-05-11 T. Kompier Vietnam Tu Le 10 161 1 1 Yen Bai 1805098003 2015-07-11 T. Kompier Vietnam Tu Le 10 161 1 1 Yen Bai 1805098012 2015-09-16 PQTC Q. T. Phan Vietnam Tu Le 10 161 1 1 Yen Bai 1805098019 [264,960,1594,1619] 2014-04-17 T. Kompier Vietnam Lai Chau 10 161 1 1 Lai Chau 1805098028 2015-06-23 T. Kompier Vietnam Hoang Lien Son 10 161 1 1 Lao Cai 1805098035 [582,1230,1629,1654] 2017-05-28 T. Kompier Vietnam Lai Chau 10 161 1 1 Lai Chau 1805098043 2013-06-12 2016-09-18 2013-06-12 PQTC V. Q. To & Dali & H. Zhang China Yangbi County Yangbijiang River 10 161 5 1 4 Yunnan 1805098052 2012-08-28 H. Zhang Laos Xiangzhigou Guiyang City Xinpuxiang Village 10 161 4 4 Guizhou 1805098058 2011-07-05 KPM T. Miyashita Laos Sekong 10 161 1 Sekong 1805098066 VII 2014, VI 2015 T. Kompier & Some Vietnam Other Hoang Lien Son Some 10 161 1 Yen Bai 1805098075 2015-06-18 2016-08-08 2015-06-18 T. Kompier & T. Kompier. Vietnam Thua Thien-Hue Prov. Cao Bang Prov. 10 161 1 Yen Bai