A review of the damselfly genus Megalestes Selys, 1862 (Insecta: Odonata Zygoptera: Synlestidae) using integrative taxonomic methods Author Yu, Xin College of Life Sciences, Chongqing Normal University, Chongqing, 401331, China Author Xue, Junli 0000-0003-0696-2596 Key Laboratory of Atherosclerosis in Universities of Shandong Province, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai'an, China. https: // orcid. org / 0000 - 0003 - 0696 - 2596 text Zootaxa 2020 2020-09-10 4851 2 245 270 journal article 8529 10.11646/zootaxa.4851.2.2 0c2aa01d-58eb-498b-a278-8b6b4367c1a2 1175-5326 4407479 DCD23BAB-CBF9-48F0-90C9-E490803F0757 Key to male Megalestes 1 Color of cercus yellow ( Fig. 3m ); genital ligula with large middle lateral lobes ( Fig. 5z ) and obvious basal lateral lobes ( Fig. 5 aa)............................................................................................. riccii - Color of cercus black or dark brown; genital ligula without obvious basal lateral lobes, middle lateral lobes relatively small or absent.............................................................................................. 2 2 Paraproct without basal tooth, straight and strong, longer than 1/2 the length of the cercus ( Fig. 6c )............... gyalsey - Paraproct with basal tooth, never straight, seldom as long as 1/2 the cercus length.................................. 3 3 Horns present at the end of genital ligula ( Fig. 5n )........................................................... 4 - Horns absent at the end of genital ligula, or only having lateral lobes............................................ 7 4 Distinct inner lateral tooth present at the middle of cercus ( Fig. 3h ), paraproct almost spherical ( Figs. 4h ; 6e )........ major - No lateral tooth at middle of cercus, apex of paraproct produced, not spherical..................................... 5 5 Paraproct apex truncate, extended transversely, serrated with some hairs, a brushlike appearance; basal tooth large with end pointed ( Figs. 4g ; 6d ); end of the genital ligula narrow, with the margin rounded ( Fig. 5t )...................... kurahashii - Paraproct apex pointed; end of the genital ligula broad with the margin trapezoidal................................. 6 6 Basal tooth of paraproct robust, longer than 1/2 the entire length of paraproct, with end pointed forward ( Figs. 4b ; 6l ); genital ligula with obvious terminal lateral lobes ( Fig. 5s )........................................................ irma - Basal tooth of paraproct very small, shorter than 1/3 the entire length of paraproct, with end pointed upward ( Figs. 4a , 6a ); genital ligula without terminal lateral lobes ( Fig. 5a, a 1 )................................................. australis 7 Dorsum of 10 th abdomen segment normal, not swelling................................................. lieftincki - Dorsum of 10 th abdomen segment more or less swelling ( Fig. 4d )............................................... 8 8 Paraproct short with apex obtuse, covered with long, dense hairs that entirely cloak the apex; basal tooth of paraproct strong with base bulged and apex very acute pointed upward or a little forward (this character varied to some degree, cf. Figs. 4k and l and 6i and j ); end of genital ligula modestly broad, elongate, and concave like a spoon; modest middle lateral lobes present but no basal and terminal lobes ( Fig. 5w and x )............................................................ micans - Paraproct produced back-upward with apex pointed or a little blunt; basal tooth of paraproct conical; end of genital ligula not elongate like a spoon; terminal lateral lobe present but basal or middle lobes absent................................. 9 9 Apex of paraproct somewhat blunt with sparse hairs mainly on the tip ( Fig. 4i and j ); end of genital ligula horizontal, broad, margin truncated, with small terminal lateral lobes ( Fig. 5u and v )............................................. haui - Apex of paraproct pointed with sparse hairs mainly on the rear side; end of genital ligula not at horizontal level......... 10 10 Apex of the cercus extended; basal prominence long, cylindrical with the end foot-like ( Figs. 3 c–d and 4c–d); basal tooth of paraproct long and strong, at least as long as the produced paraproct apex ( Figs. 3c and d ; 4c and d ); end of genital ligula narrow, slightly spoon-like, with terminal lateral lobes divergent largely, up-curved at tips ( Fig. 5o )...................... distans - Apex of the cercus normal; basal prominence short, flat, somewhat rectangular; end of genital ligula not spoon-like...... 11 11 End of genital ligula broad, terminal lateral lobes very large and bent forward like wings ( Fig. 5p ).................. heros - End of genital ligula narrow, terminal lateral lobes small and wrapping genital end tightly ( Fig. 5q )............. omeiensis