Sarasaeschna

Chen, Szu-Lung & Yeh, Wen-Chi, 2014, Description of a new species of the genus Sarasaeschna Karube & Yeh, with a key to the species of Taiwan (Odonata: Anisoptera: Aeshnidae), Zootaxa 3764 (1), pp. 92-100 : 99

Key to the species of Sarasaeschna in Taiwan

1 Upper spot on dorsal side of pterothorax triangular and transverse ( Fig. 18 ); flagella of male penis protrude vertically and perpendicular to 4th segment (cf. Karube & Yeh 2001, Fig. 11 ; Yeh & Chen 2000, Fig. 19 b); male with posteroventral corner of S2 smoothly curved (Fig. 31); male cercus shorter than 2X length of S10 ( Figs. 22, 26 ); maculation of S2 as shown in Figs. 8–9 . S. pyanan

- Upper spot on dorsal side of pterothorax round or oval ( Figs. 19–21 ); flagella of male penis not protruding vertically; male cercus as long as or longer than 2X length of S10; male with posteroventral corner of S2 obtusely angulate (Fig. 32)......... 2

2 PD spots of S2 distinctly separated from each other ( Figs. 10–11 ); flagella of male penis protruding obliquely and laterally crossed over 4th segment (cf. Karube & Yeh 2001, Fig. 14 ; Yeh & Chen 2000, Fig. 19 c), male cercus slender ( Figs. 23, 27 )................................................................................................. S. lieni

- PD spots of S2 close or connected to each other ( Figs. 12–13, 15–17 ); flagella of male penis protruding horizontally, male cercus stalked with apical part abruptly broadened.............................................................. 3

3 PD spots of S2 transverse ( Figs. 12–13 ); male cercus razor-like, epiproct elongate with shallow apical notch ( Figs. 24, 28 ); female with abdomen spindle-shaped, female cercus more than 2X as long as S10 (Fig 30)................. S. tsaopiensis

- PD spots of S2 round ( Figs. 15–17 ); male cercus sickle-like, epiproct rectangular with deep apical notch (Figs. 6, 25, 29); female with abdomen nearly straight, female cercus short, as long as S10 (Fig. 7)....................... S. chiangchinlii

Figures

FIGURES 18 – 29. Different characters of the Sarasaeschna of Taiwan. 18 – 21, male pterothorax, dorsal; 22 – 25, male cerci, dorsal; 26 – 29, male cerci, lateral; 18, 22 & 26, S. pyanan; 19, 23 & 27, S. lieni; 20, 24 & 28, S. tsaopiensis; 21, 25 & 29, S. chiangchinlii.

FIGURES 8 – 17. Dorsal maculations of abdominal S 2 in the Sarasaeschna of Taiwan. 8, S. pyanan, male; 9, S. pyanan, female; 10, S. lieni, male; 11, S. lieni, female; 12, S. tsaopiensis, male; 13 & 14, S. tsaopiensis, females, 13, normal form, 14, dark form; 15, S. chiangchinlii, holotype male; 16 & 17, S. chiangchinlii, paratype females.