Drepanosticta, 1917

Phan, Quoc Toan, Yokoi, Naoto, Makbun, Noppadon, Joshi, Shantanu, Subramanian, K. A., Ngo, Quoc Phu & Dow, Rory A., 2021, A review of the Drepanosticta carmichaeli-group, with the description of D. wildermuthi sp. nov. from the Central Highlands of Vietnam (Odonata: Zygoptera: Platystictidae), Zootaxa 5067 (2), pp. 187-210 : 205-206

Provisional key to mature males of Drepanosticta carmichaeli- group

The characters of the genital ligula used in the last couplet of the key are taken from Wilson (1997) and the reader is referred to the figures in that paper.

1 A blue band present on the dorsum of the head between the compound eyes and blue antehumeral stripes at least partially present on the synthorax ( Fig. 4a )................................................................... carmichaeli

- No blue band present on the dorsum of the head between the compound eyes and no antehumeral stripes present......... 2

2 Cerci in lateral view only gradually expanding from their narrowest point to the apices.............................. 3

- Cerci in lateral view immediately expanding after their narrowest point …........................................ 4

3 Abdominal S8 without pale dorsal markings, S9–10 with pale dorsal markings ( Fig. 11a )................... wildermuthi

- Abdominal S8 with some pale dorsal markings, S9–10 without pale dorsal markings...................... tenella

4 Cerci running almost straight along their upper margin. Abdominal S8–S10 lacking pale dorsal markings........ sumatrana

- Cerci downturned around half the length. At least one of abdominal S8–10 with some pale markings dorsally............ 5

5 Cerci with a distinct, well-developed ventral heel immediately after their narrowest point............................ 6

- Cerci with no distinct ventral heel or at most a slight, rounded ventral heel immediately after their narrowest point........ 7

6 Ventral heel on cerci well defined but small, no pale color dorsally on S8, pale dorsal marks on S9–10 yellowish-white ( Fig. 1c )........................................................................................ vietnamica

- Ventral heel on cerci larger, at least some blue dorsally on S8, pale dorsal marks on S9–10 blue ( Fig. 6b )........... emtrai

7 Pale dorsal markings on the terminal abdominal segments confined to S8 ( Fig. 2c )......................... annandalei

- At least some pale dorsal markings on all of S8–10.......................................................... 8

8 A well-defined pale stripe, running from the metakatepisternum most of the length of the metepisternum present ( Fig. 7a )................................................................................................. jurzitzai

- Metepisternum either entirely dark or with a most a small pale mark or stripe disconnected from the metakatepisternum... 9

9 Metepisternum entirely dark, S8–10 with bright blue dorsal markings. Arms of terminal segment of genital ligula smoothly curved with slightly angled apices..................................................................... hongkongensis

- Metepisternum typically with a small centrally positioned pale mark, S8–10 with greyish white to very pale blue dorsal markings. Arms of terminal segment of genital ligula sharply reflexed (almost at a right angle) near their origin and with acutely curved apices.................................................................................. brownelli

Figures

FIGURE 1. Drepanosticta annandalei ♂ [a, c, e, g, h, i] & ♀ [b, d, f, j], Bamboo Teri,Andaman Island, India (NZC). (a, b), head & thorax, lateral view; (c), head, dorsal view; (d), synthorax, dorsal view; (e, f), terminal segments of abdomen, lateral view; (g–i) appendages in lateral, dorsal and ventral view; (j), pterostigma, ♀.

FIGURE 2. Drepanosticta brownelli ♂, Nankushan Mountain, China (KPMNH). (a), head and thorax, lateral view; (b), prot- horax, lateral view; (c–e), appendages in oblique dorsal, lateral and ventral view.

FIGURE 4. Drepanosticta polychromatica, holotype ♂ (NHMUK). (a), holotype male with labels; (b), head and thorax, lateral view; (c), abdominal tip, lateral view.

FIGURE 6. Features of Drepanosticta jurzitzai, ♂ [a–d] & ♀ [e–h], Chantaburi, Thailand (ZCDTU). (a, d), head and thorax in lateral view; (b, f), head in frontal view; (c, g), prothorax in lateral view; (d, h), prothorax in dorsal view.

FIGURE 7. Features of Drepanosticta jurzitzai, ♂ [a–e] & ♀ [f–h], Chantaburi, Thailand (ZCDTU). (a, f), abdominal tip in lateral view; (b, c), appendages in dorsal & lateral view; (d), paraprocts in ventral view; (e), genital ligula; (g), abdominal tip in dorsal view; (h), pterostigma.

FIGURE 11. Drepanosticta wildermuthi sp. nov., holotype ♂ & paratype ♀. (a), abdominal tip in lateral view, holotype ♂; (b), abdominal tip in dorsal view, holotype ♂; (c), pterostigma, holotype ♂; (d), abdominal tip in lateral view, paratype ♀.