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See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/317822529 A survey of Odonata from eastern Bhutan, with nine new national records Article · June 2017 CITATIONS READS 0 575 1 author: Thinley Gyeltshen Sherubtse College 9 PUBLICATIONS 11 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Inventory of Odonata in Bhutan.. View project Inventory of Bees and Wasps of Bhutan View project All content following this page was uploaded by Thinley Gyeltshen on 23 June 2017. The user has requested enhancement of the downloaded file. 354 A survey of Odonata from eastern Bhutan, with nine new national records Thinley Gyeltshen Department of Zoology, School of Environmental and Life Sciences, Sherubtse College, Kanglung, Bhutan; [email protected] Abstract. Odonates were collected in five districts (Tashigang, Samdrupjongkhar, Lhuntse, Pemagatshel and Zhemgang) in the eastern half of Bhutan between 13-iv- and 30-v-2016 and in Lhuntse district and Kanglung region in June 2016. A total of 16 localities were visited and 42 species were found, nine of which are new to Bhutan. These arePhiloganga montana, Anisogomphus occipitalis, Gomphidae sp., Davidius zallorensis, Stylogomphus inglisi, Chloro gomphus preciosus, Lyriothemis bivittata, Potamarcha congener and Zygonyx iris, increasing the number of Odonata species known from Bhutan to 104. Further key words. Dragonfly, damselfly, Anisoptera, Zygoptera Introduction The knowledge on the Odonata fauna of Bhutan has improved greatly in recent years resulting in a significant increase in the number of species known to occur there. Only eleven species were known in 1991 (Fraser 1936b; Lieftinck 1977; Tsuda 1991) but from 2002 to 2014 no fewer than 73 species were added to the list by Mitra and his co-researchers (Mitra 2002, 2006, 2008, 2013; Mitra & Thinley 2006; Mitra et al. 2012, 2014). Among these was the mysterious Epiophlebia laidlawi Tillyard, 1921 of which larvae have been recorded from several rivers and streams in Bhutan since 2009 although adults have thus far not been found (Brockhaus & Hartmann 2009). Kalkman & Gyeltshen (2016) added 11 additional species to the list and indicated that there are still many more species undiscovered in Bhutan. Most recently, Gyelt- shen et al. (2016) added two new species (Camacinia giganta and Libellago line ata) to the Bhutan checklist, bringing the number of taxa known from Bhutan to 92. Following a study carried out in the western part of the country in October 2015 (Kalkman & Gyeltshen 2016) a corresponding field visit to the eastern part of the country was deemed necessary. Previous studies on the dragonflies from eastern Bhutan concentrated on the area around Trashigang district and nearby districts with major representations coming from Bumdeling (Tashiyangtse district), Kanglung (Tashigang district) and Samdrupcholing (Samdrupjongkhar district). Records from other districts are scarce and therefore the field work of spring 2016 attempted to cover these areas. Material and methods Fieldwork was carried out between 13-iv- and 30-v-2016 in the five eastern dis- tricts Tashigang, Samdrupjongkhar, Lhuntse, Pemagatshel and Zhemgang (Fig. 1). Notulae odonatologicae 8(9) 2017: 319-374 355 Additional records were collected in Lhuntse district and Kanglung region in vi- -2016. Most places visited had not been explored for dragonflies previously. The sixteen sites ranged in elevation from 125 to 1 706 m a.s.l. Common species such as Diplacodes trivialis, Orthetrum glaucum, O. pruinosum and O. triangulare were not collected but notes on their presence were made. Specimens were identified using the identification keys of Fraser (1933, 1934, 1936), Lieftinck (1977), Laidlaw (1922) and Asahina (1986). Specimens collected are currently in the author’s col- lection to be later deposited in the museum of the National Biodiversity Centre of Bhutan. List of localities with odonate records (1) Dezama, Nganglam, Pemagatshel District, small stream by roadside (26°50’29.0.3”N, 91°16’34.3”E, 720 m a.s.l), 14-iv-2016 and 27-iv-2016. (2) Nganglam, Pemagatshel District, small pond (26°50’13.9”N, 91°14’58.3”E, 574 m a.s.l), 14-iv-2016. (3) Tokaphungri, Norbugang, Pemagatshel District, small brook at roadside (26°50’31.6”N, 91°01’25.3”E, 686 m a.s.l), 15-iv-2016. (4) Thinleygang, Panbang, Zhemgang District, small running stream at roadside (26°50’42.6”N, 90°59’39.6”E, 390 m a.s.l), 15-iv-2016. (5) Mangdue chu, Panbang, Zhemgang Dis- trict, banks of Mangdechu river before the confluence with Kurigongri (26°50’35.7”N, 90°56’42.67”E, 125 m a.s.l), 17-iv-2016. (6) Jirangang, Panbang, Zhemgang District, small stream bordered by a footpath (26°51’11.9”N, 90°56’29.4”E, 187 m a.s.l), 17-iv-2016. (7) Allabhari, Nganglam, Pemagatshel District, stagnant water on un- paved road (26°49’21.9”N, 91°14’26.5”E, 270 m a.s.l), 18-iv-2016. (8) Jampaney, Jo- motsangkha, Samdrup Jongkhar District, small brook at roadside (26°54’52.4”N, 92°06’03.5”E, 345 m a.s.l), 20-iv-2016. (9) Phatung, Nganglam, Pemagatshel Dis- trict, small stream at roadside (26°51’06.3”N, 91°15’06.3”E, 650 m a.s.l), 25-iv-2016. Fig. 1. Map of Bhutan with the regions visited and the topo- graphic position of the locali- ties sampled. Notulae odonatologicae 8(9) 2017: 319-374 356 (10) Upper Tshenkhari, Nganglam, Pemagatshel District, cleared area beside a small stream (26°52’09.1”N, 91°13’54.5”E, 522 m a.s.l), 26-iv-2016. (11) Remung, Sam- drupjongkhar District, Small stream with some overhead vegetation (26°59’21.0”N, 91°30’00.2”E, 1 028 m a.s.l), 30-iv-2016. (12) Remung, Samdrupjongkhar District, Very small stream covered with thick bushes and bordered by trees and a deserted human track (26°58’47.2”N, 91°29’42.6”E, 923 m a.s.l), 30-iv-2017. (13) Fawan, Lhuntse District, small open brook with waterfall (29°29.457”N, 91°10.981”E, 915 m a.s.l), 08-v-2016. (14) Bamridang, Kanglung,Tashigang District, marshy spring on hillside (27°16’16.7”N, 91°31’50.7”E, 1 708 m a.s.l), 14-v-2016. (15) Ritsangdung, Kanglung, Tashigang District, narrow channel of running water at the roadside (27°17’16.3”N, 91°30’22.7”E, 1 672 m a.s.l), 04-vi-2016. (16) Merphey, Kanglung, Tashigang District, small stagnant water body along roadside (27°17’24.1”N, 91°31’08.0”E, 1 690 m a.s.l), 04-vi-2016. Results In total, 42 species were collected from 16 sampling sites. Philoganga montana, An iso gomphus occipitalis, Gomphidae sp., Davidius zallorensis, Stylogomphus inglisi, Chlorogomphus preciosus, Lyriothemis bivittata, Potamarcha congener and Zygonyx iris are additions to the fauna of Bhutan. These records increase the number of Odo- nata species known from Bhutan to 104 (cf. Gyeltshen et al. 2017). List of species collected New species for Bhutan are marked with an asterisk. Family Lestidae 1. Lestes praemorsus Hagen in Selys, 1892 (2) 1♂ (7) 3♂ 1♀. Family Calopterygidae 2. Caliphaea confusa Hagen in Selys, 1859 (14) 1♂ 2♀. 3. Neurobasis chinensis (Linnaeus, 1758) (7)1♂ 1♀. Family Chlorocyphidae 4. Aristocypha cuneata (Selys, 1853) (5) 2♂ 1♀ (7) 1♂. 5. Aristocypha quadrimaculata (Selys, 1853) (1) 2♂ 1♀ (4) 1♂ (5) 1♂ (13) 1♂. 6. Paracypha unimaculata (Selys, 1853) (5) 1♂ 1♀. Notulae odonatologicae 8(9) 2017: 319-374 357 Family Euphaeidae 7. Anisopleura comes Hagen, 1880 (1) 1♂ (3) 2♂ (11) 2♂ 1♀ (14) 1♂. 8. Bayadera indica (Selys, 1853) (9) 2♂ 1♀ (13) 1♂ (14) 1♀. Family Philogangidae 9. *Philoganga montana (Hagen in Selys, 1859) (1) 1♀. Family Platycnemididae 10. Calicnemia eximia (Selys, 1863) (1) 2♂ 1♀. 11. Calicnemia miniata (Selys, 1886) (1) 1♂ 2♀. 12. Coelicia sp. (12)1♂ 1♀. 13. Copera vittata assamensis Laidlaw, 1914 (7) 1♂. Family Coenagrionidae 14. Agrionemis femina (Brauer, 1868) (2) 1♂. 15. Amphiallagma parvum (Selys, 1876) (1) 1♂. 16. Ceriagrion coromandelianum (Fabricius, 1798) (2) 1♂. 17. Ischnura aurora (Brauer, 1865) (1) 1♂ (5) 2♂. 18. Pseudagrion rubiceps Selys, 1876 (5) 1♂ 1♀. Family Aeshnidae 19. Anax indicus Lieftinck, 1942 (7) 1♂. 20. Periaeschna magdalena Martin, 1909 (1) 1♂. Family Gomphidae 21. *Anisogomphus occipitalis (Selys, 1854) (1) 1♂ (14) 1♂ 2♀. Notulae odonatologicae 8(9) 2017: 319-374 358 22. Davidius baronii Lieftinck, 1977 (14) 1♂ 1♀. 23. *Davidius zallorensis Hagen in Selys, 1878 (14) 1♂. 24. *Gomphidae sp. (5) 1♀. 25. Perissogomphus stevensi Laidlaw, 1922 (8) 1♀ (13) 1♂ 1♀. 26. *Stylogomphus inglisi Fraser, 1922 (1) 1♂. Family Chlorogomphidae 27. Chlorogomphus mortoni Fraser, 1936 (1) 1♂ (4) 2♂ (11) 1♀. 28. *Chlorogomphus preciosus (Fraser, 1924) (11) 1♂. Family Cordulegastridae 29. Anotogaster nipalensis Selys, 1854 (15) 1♂ 1♀. Family Macromiidae 30. Macromia moorei Selys, 1874 (1) 1♂ (11) 2♂. Family Libellulidae 31. Crocothemis servilia (Drury, 1773) (5) 2♂ 1♀ (10) 1♂. 32. Diplacodes nebulosa (Fabricius, 1793) (5) 2♂ 1♀. 33. *Lyriothemis bivittata (Rambur, 1842) (6) 2♂ (9) 1♂. 34. Neurothemis fulvia (Drury, 1773) (7) 1♀. 35. Orthetrum internum McLachlan, 1894 (14) 1♂. 36. Orthetrum luzonicum Brauer, 1868 (9) 1♂ (16) 1♂. 37. Palpopleura sexmaculata (Fabricius, 1787) (5) 1♂. 38. Pantala flavescens(Fabricius, 1798) (5) 1♂ 1♀. Notulae odonatologicae 8(9) 2017: 319-374 359 39. *Potamarcha congener (Rambur, 1842) (7) 1♂. 40. Trithemis festiva (Rambur, 1842) (1) 2♂. 41. Trithemis pallidinervis (Kirby, 1889) (5) 2♂ 1♀. 42. *Zygonyx iris Selys, 1869 (13) 1♀. Discussion Kemp & Butler (2001) reported Philoganga montana (Fig.