Prodasineura verticalis Selys, 1860

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 : 9-11

Prodasineura verticalis Selys, 1860

Figs 6 D–F, 7 D–F, 8 D–E, 13 G–H, 16 A, 18

Material examined

VIETNAM – Kien Giang Province • 1 ♂; Phu Quoc Island ; 1 Jan. 2016; T. Kompier leg.; TKC • 1 ♂; Phu Quoc Island ; 18 Apr. 2016; Q.T. Phan leg.; ZCDTU 2016041810-ODO • 3 ♂♂, 1 ♀; Phu Quoc Island, Nui Chua ; 6 Mar. 2018; To Van Quang leg.; ZCDTU 2018030611-ODO . – Lam Dong Province • 2 ♂♂, 1 ♀; Bao Loc District, Da Ton; 22 Apr. 2016; Q.T. Phan leg.; ZCDTU 2016042211-ODO . – Kon Tum Province • 2 ♂♂, 2 ♀♀; Chu Mom Ray National Park; 12 Jun. 2019; Q.T. Phan leg.; ZCDTU 2019061211-ODO .

Diagnosis

In Vietnam, males of both P. croconota and P. verticalis with large egg-shaped orange markings on dorsum of synthorax but those in P. croconota shorter and broader than in P. verticalis ( Fig. 6 C–D), less saturated in colouration. In males of P. croconota , head with two small spots dorsally adjacent to ocellar tubercle ( Fig. 6A ) but with large transverse stripe in P. verticalis ( Fig. 6E ). Cerci in P. verticalis mostly black except for indistinct basal yellow stripe dorsally ( Fig. 7 D–E) while cerci dorsally entirely yellowish or bluish in P. croconota ( Fig. 7 A–B); ultimate segment of genital ligula of P. verticalis acute at apex ( Fig. 7F ) but blunt in P. croconota ( Fig. 7C ). Posterior pronotal lobe of prothorax of female P. verticalis characterized by two thin, long horns ( Fig. 13 G–H) while robust and short in P. croconota ( Fig. 13 A–B).

Remarks

Bui (2007) recorded Elattoneura sp. at Phu Quoc Island, which subsequently was reidentified as a Prodasineura sp. by Do et al. (2011). Based on examination of specimens, it was identified as P. verticalis by Kompier (2019). This paper confirms the identification of the Prodasineura species from Phu Quoc Island recorded in Bui (2007), Do et al. (2011) and Kompier (2019) was P. verticalis . Asahina (1997) presumed that a male from Mai Chau of Hoa Binh Province (northern Vietnam) was probably P. verticalis (see in Asahina 1997: 20, figs 7–8). However, according to Asahina, this was “a pale bluish striped, black-bodied species”, which is not consistent with P. verticalis with orange stripes. Asahina’s drawing shows a species with thin antehumeral stripe, which may well be Prodasineura coerulescens , which occurs also in the similar lowland limestone forest in Quang Binh Province, rather than P. hoffmanni (see in Asahina 1997: 20, figs 7–8) which is recorded further south from primary forest of the Central Highlands or evergreen forests in Cat Tien National Park. Asahina’s (1997) male should be re-examined to establish its identity with certainty.

Distribution

Vietnam ( Fig. 18 ): Kon Tum (Chu Mom Ray National Park), Lam Dong (Bao Loc District), Dong Nai (Cat Tien National Park) and Kien Giang (Phu Quoc Island) Provinces ( Kompier 2019; this study).

Figures

Fig. 6. Prodasineura Cowley, 1934 spp. A–C. P. croconota Ris, 1916, ZCDTU 2017060802-ODO. D–F. P. verticalis Selys, 1860, ZCDTU 2018030611-ODO. A, E = ♂, head and thorax, lateral view; C–D = ♂, synthorax, dorsal view; B, F = ♀, head and thorax, lateral view. Images not to scale.

Fig. 7. Prodasineura Cowley, 1934 spp., males. A–C. P. croconota, ZCDTU 2017060802-ODO. D–F. P. verticalis Selys, 1860, ZCDTU 2018030611-ODO. A, D, G = tip of abdomen, dorsal view; B, E = tip of abdomen, lateral view; C, F = genital ligula, oblique-ventral view. Images not to scale.

Fig. 8. Prodasineura Cowley, 1934 spp., females. A–C. P. croconota Ris, 1916, ZCDTU 2017060802- ODO. D–E. P. verticalis Selys, 1860, ZCDTU 2018030611-ODO. F. P. laidlawi (Forster in Laidlaw, 1907), modified from Asahina (1983: fig. 22). A, G–F = prothorax, lateral view; B, D = prothorax, dorsal view; C, E = tip of abdomen, lateral view. Images not to scale.

Fig. 13. Posterior pronotal lobe of prothorax of Prodasineura Cowley, 1934 spp., females, lateral and dorsal views. A–B. P. croconota Ris, 1916, ZCDTU 2017060802-ODO. C–D. P. kong sp. nov., ZCDTU 019071817-ODO. E–F. P. lancastrei sp. nov., ZCDTU 2019051217-ODO. G–H. P. verticalis Selys, 1860, ZCDTU 2018030611-ODO. 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. 18. Distribution map of Prodasineura Cowley, 1934 spp. in Vietnam (orange group species). (●) P. croconota Ris, 1916. (●) P. verticalis Selys, 1860. (●) Prodasineura kong sp. nov. (●) P. lancastrei sp. nov.