Prodasineura coerulescens (Fraser, 1932)

Phan, Quoc Toan & Ngo, Quoc Phu, 2020, A revision of the systematics and distribution of the damselfly genus Prodasineura Cowley, 1934 (Odonata: Zygoptera: Platycnemididae) in Vietnam with description of two new species, European Journal of Taxonomy 650, pp. 1-27 : 4

Prodasineura coerulescens (Fraser, 1932)

Figs 2 A–B, 3 A–B, E, 4 A–C, 5 D–E, 16 C, 17

Material examined

VIETNAM – Dong Nai Province • 3 ♂♂, 3 ♀♀; Dinh Quan District, Mai waterfall ; 8 Oct. 2016; Q.T. Phan leg.; ZCDTU 2016100801-ODO . – Quang Binh Province • 2 ♂♂; Minh Hoa District, Tan Hoa Commune ; 18 Nov. 2019; Q.T. Phan & Q.P. Ngo leg.; ZCDTU 2019111801-ODO .

Diagnosis

Male black with bluish stripes on head, thorax, abdomen and anal appendages ( Figs 2A , 3 A–B). S8 with two small distinct spots (in Dong Nai specimens, Fig. 3A ) or entire dorsal stripe which extends posteriorly (in Quang Binh specimens); blue marking covering most of S9, gradually narrowing at base thus forming blue triangular-shaped spot; dorsal S10 blue, lateral-ventral black ( Fig. 3A ). Cerci dorsally entirely blue; paraproct blue, black apically ( Fig. 3 A–B). Female similar to male in shape, body colouration; pale elements are yellowish ( Fig. 2B ). Posterior pronotal lobe of prothorax with separate ear-like process on each side ( Figs 4B , 5 D–E).

Distribution

Vietnam ( Fig. 17 ): Quang Binh (Minh Hoa District) and Dong Nai (Dinh Quan District and Cat Tien National Park) Provinces ( Do & Dang 2007; Kompier 2019; this study).

Figures

Fig. 2. Prodasineura Colwey, 1934 spp., head and thorax, lateral view (A, C, E: ♂, B, D, F: ♀) A–B. P. coerulescens (Fraser, 1932), ZCDTU 2016100801-ODO. C–D. P. doisuthepensis Hoess, 2007, ZCDTU 2017062201-ODO. E–F. P. hoffmanni Kosterin, 2015, ZCDTU 2017062202-ODO (E). Fig. 2F is modified from Kosterin (2015: fig. 2a), from Dak Dam village, Mondulkiri Province, Cambodia. Images not to scale.

Fig. 3. Prodasineura Cowley, 1934 spp., males. A–B, E. P. coerulescens (Fraser, 1932), ZCDTU 2016100801-ODO. C–D, F. P. doisuthepensis Hoess, 2007, ZCDTU 2017062201-ODO. G–I. P. hoffmanni Kosterin, 2015, ZCDTU 2017062202-ODO. A, C, G = tip of abdomen, dorsal view; B, D, H = tip of abdomen, lateral view. E–F, I: Genital ligula, oblique-ventral view. Images not to scale.

Fig. 4. Prodasineura Cowley, 1934 spp., females. A–C. P. coerulescens (Fraser, 1932), ZCDTU 2016100801-ODO. D–F. P. doisuthepensis Hoess, 2007, ZCDTU 2017062201-ODO. G–H. P. hoffmanni Kosterin, 2015, ZCDTU 2017062202-ODO. A, D = prothorax, lateral view; B, E, G = prothorax, dorsal view; C, F, H = tip of abdomen, lateral view (Fig. 4G–H is modified from in Kosterin 2015: fig. 4c, h). Images not to scale.

Fig. 5. Posterior pronotal lobe of prothorax of Prodasineura Cowley, 1934 spp., females. A–B. P. autumnalis (Fraser, 1922), lateral and dorsal views. C. P. doisuthepensis Hoess, 2007, dorsal view. D–E. P. coerulescens (Fraser, 1932), lateral and dorsal views. F. P. hoffmanni Kosterin, 2015, dorsal view. (Fig. 5C, F is modified from Kosterin 2015: fig. 3c–d). Images not to scale.

Fig. 16. Habitat of Prodasineura Cowley, 1934 spp. in Vietnam. A. Gia Trang stream in Chu Mom Ray National Park, home of P. doisuthepensis Hoess, 2007 and P. verticalis Selys, 1860. B. Typical stream where P. lancastrei sp. nov., P. autumnalis (Fraser, 1922) and P. croconota Ris, 1916 occur, in Pu Mat National Park. C. Open limestone stream in Tan Hoa Commune, Minh Hoa District of Quang Binh Province with three species: P. autumnalis, P. kong sp. nov. and P. coerulescens (Fraser, 1932) coexisting. D. Habitat of P. hoffmanni Kosterin, 2015 and P. autumnalis in Mang Canh, Kon Plong District of Kon Tum Province.

Fig. 17. Distribution map of Prodasineura Cowley, 1934 spp. in Vietnam (blue group species including the blackish P. autumnalis (Fraser, 1922)). (●) P. autumnalis. (●) P. coerulescens (Fraser, 1932). (●) P. doisuthepensis Hoess, 2007. (●) P. hoffmanni Kosterin, 2015.