Key to Gobio and Romanogobio species in Turkey

1 Caudal peduncle 1.5–2.5 times its depth.................................................................... 2

- Caudal peduncle 3.1–3.8 times its depth; Kura River.................................... .. Romanogobio macropterus

2 8–10 scale rows between dorsal fin origin and lateral line; 8–12 scales between posterior extremity of pelvic-fin base and anus.................................................................................................... 3

- 5–7 scale rows between dorsal fin origin and lateral line; 4–8 scales between posterior extremity of pelvic-fin base and anus...................................................................................................... 8

3 53–56 lateral-line scales.................................................................... G. maeandricus

- 39–49 lateral-line scales................................................................................ 4

4 Scales on belly approximately equal to pupil diameter; predorsal length 48–52. % SL....................... G. insuyanus

- Scales on belly markedly smaller than pupil; predorsal length 45–48 % SL........................................ 5

5 Scales on breast extending to isthmus; predorsal back markedly convex...........................................6

- Scales on breast not or slightly extending forward to the level of pectoral-fin origin, scales on pectoral-fin base often deeply embedded in skin; predorsal back slightly convex............................................................ 7

6 Interorbital distance approximately 1.4–1.6 times in eye diameter; caudal-fin length 12–17 % SL, anal fin length 20–24 % SL; 8–10 scales between posterior extremity of pelvic-fin base and anus.................................. G. intermedius

- Interorbital distance approximately 1.6–1.8 times in eye diameter; caudal-fin length 17–20 % SL, anal fin length 15–17 % SL; 10–14 scales between posterior extremity of pelvic-fin base and anus.................................. G. hettitorum

7 Length of lower jaw 1.3–1.4 times its maximum width.............................................. G. battalgilae

- Length of lower jaw 1.0–1.3times its maximum width............................................ G. microlepidotus

8 Interorbital distance 1.6–1.9 times in eye diameter; pelvic fin not reaching behind anus in females; head profile behind the nos- trils markedly convex...................................................................... G. gymnostethus

- Interorbital distance 1.0–1.6 times in eye diameter; pelvic fin reaching behind anus in female; head profile behind the nostrils

straight or slightly convex..............................................................................9 9 Breast naked or incompletely scaled, if breast scaled, scales extending forward of the level of pectoral fin origin; snout pointed, not or slightly concave anterior to the nostril............................................................... 10

- Breast completely scaled, scales extending to isthmus; snout rounded, distinctly concave anterior to the nostril.......... 11

10 Head length 28–30 % SL.................................................................... G. kovatschevi

- Head length 24–26 % SL.................................................................. G. cf. caucasicus

11 4–5 scales between posterior extremity of pelvic-fin base and anus; interorbital distance 1.1–1.3 times in eye diameter................................................................................................ G. bulgaricus

- 6–8 scales between posterior extremity of pelvic-fin base and anus; interorbital distance 1.4–1.6 times in eye diameter............................................................................................... G. sakaryaensis