Key for trans-Andean species of Creagrutus in Colombia

THE FOLLOWINg KEy IS IN PART MODIFIED FROM THAT OF HAROLD & VARI (1994).

1 Lateral line incomplete.................... Creagrutus maracaiboensis (Lake Maracaibo basin and Río Rancheria basin)

1´Lateral line complete................................................................................... 2

2 Lamellar flap present over pores of scales of lateral line................ Creagrutus caucanus (upper Río Cauca drainage)

2´No lamellar flaps over pores of lateral line scales............................................................ 3

3 30 to 32 scales in lateral line series............................................................................................ Creagrutus nigrostigmatus (Pechelín, Zaragocilla, Culebra and other streams of the Caribbean slopes)

3´34 to 39 scales in lateral line series........................................................................ 4

4 Third infraorbital not in contact with preopercle............................................................. 5

4´Third infraorbital in contact with preopercle................................................................ 6

5. Eye diameter less than 26.8% of HL....................................................................... 7

5´Eye diameter more than 27.2% of HL............................ Creagrutus guanes (Middle Río Magdalena drainage)

6 No dark stripe or spot on middle caudal-fin rays............................................................. 8

6´Middle caudal-fin rays with dark stripe or spot.............................................................. 9

7 Pelvic fins with short hooks on rays (usually shorter than the width of the branched rays; Fig. 2A); dorsal portion of body with dark reticulate pattern.................................... Creagrutus dulima (upper Río Magdalena River drainage)

7´Pelvic fins with long hooks on rays (usually of the same length as the width of the branched rays; Fig. 2B); dorsal portion of body without dark reticulate pattern................................... Creagrutus paralacus (Lake Maracaibo basin)

8 Caudal-peduncle depth 10.7–11.8 % SL................................... Creagrutus brevipinnis (Río Cauca basin)

8´Caudal-peduncle depth 12.6–15.9 % SL........... Creagrutus magdalenae (Río Magdalena and lower Río Cauca drainage)