Revision of the species of the Merodon nanus group (Diptera: Syrphidae) including three new species Author Vujić, Ante Author Radenković, Snežana Author Ačanski, Jelena Author Grković, Ana Author Taylor, Mike Author Şenol, Serdar Gökhan Author Hayat, Rüstem text Zootaxa 2015 4006 3 439 462 journal article 10.11646/zootaxa.4006.3.2 d01e127d-f265-40a9-a52a-5230d9063733 1175-5326 245527 17A59479-F0F0-450A-9E9C-A0379113838C Key for species of M. nanus group (males) 1 All tarsi pale ( Fig. 4 C) (if darker, always uniformly coloured; with the exception of some specimens from Mugla mountain, Turkey ). Male genitalia: hypandrium with strongly pointed, sharp apex ( Figs. 7 D, 11B)............... Merodon telmateia - At least apical two tarsomeres brown or dark dorsally (as on Fig. 4 D). Male genitalia: hypandrium with rounded or slightly pointed apex ( Figs. 5 B, 6B, 8C, 9B)...................................................................... 2 2 Hind trochanter without such patch. Aedeagal box elongated ( Figs. 10 C–10E), from 2 to 3 times shorter than the length of hypandrium ( Figs. 4 B, 8B, 9B:ab); inner processes of hypandrium settled in apical 1/4 ( Figs. 5 B, 9B); ventral margin of posterior lobe of surstylus moderately convex or almost straight ( Figs. 5 A, 9A)....................................... 4 - Hind trochanter with a patch of short thick orange pile. Aedeagal box short and broad ( Fig. 12 A, 12B), at least 4 times shorter than the length of the hypandrium ( Figs. 6 B, 8C: ab); inner processes of hypandrium settled in apical 1/2.5–3 ( Figs. 6 B, 8C: ih); ventral margin of posterior lobe of surstylus strongly convex ( Figs. 6 , 8 )..................................... 3 3 Posterior lobe of surstylus very large, more than 2 times longer than cercus ( Fig. 8 A). Inner edge of apical part of hypandrium S-shaped, strongly sclerotized ( Fig. 7 A: x); aedeagal apodeme attached to the theca before the middle of dorsal margin ( Fig. 8 C: n).......................................................................... Merodon neonanus sp. n. - Posterior lobe of surstylus smaller, less than 2 times longer than cercus ( Fig. 6 A). Inner edge of apical part of hypandrium straight, unsclerotized ( Fig. 7 B: x); aedeagal apodeme attached to the theca in the middle of dorsal margin ( Fig. 6 B: n)...................................................................................... Merodon kopensis sp. n. 4 Distal end of aedeagal box strongly bifurcated in ventral view ( Fig. 5 C). Tip of posterior lobe of surstyle rounded, directed anteriorly, with convex posterior margin ( Fig. 5 A)............................................... Merodon nanus - Distal end of aedeagal box without strong lateral processes in ventral view ( Fig. 5 D). Tip of posterior lobe of surstyle triangular, more narrow, with straight posterior margin ( Fig. 9 A)................................... Merodon rasicus sp. n.