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1A. EIGHT OR FEWER BRANCHED ANAL-FIN RAYS. LATERAL LINE GENERALLY MIDLATERAL OR SUB-MIDLATERAL (FIG.1A,B). BARBELS USUALLY PRESENT....................2
1B. NINE OR MORE BRANCHED ANAL-FIN RAYS. LATERAL LINE STRONGLY DECURVED AND SITUATED BELOW THE MIDLINE (FIG. 1C). BARBELS ABSENT......................7
2A. MOUTH UNMODIFIED (FIG. 2A), VENTRAL SUCTORIAL DISC ABSENT .................................3
2B. MOUTH HIGHLY MODIFIED (FIG. 2B,C,D), JAWS WITH KERATINIZED CUTTING EDGES VISIBLE (FIG. 2C) OR ON INTERIOR OF MOUTH...5
3A. SEVEN OR EIGHT BRANCHED DORSAL-FIN RAYS, BODY SCALES WITH FEW DIVERGENT STRIAE
....................4
3B. NINE OR MORE BRANCHED DORSAL-FIN RAYS, SCALES WITH
NUMEROUS PARALLEL OR CONVERGENT STRIAE
....................LABEOBARBUS
4A. SCALES OF MIDLATERAL ROW GREATLY ENLARGED, AND
SHIELD-LIKE, TWICE THE SIZE OF ADJACENT SCALE ROWS AT
LEVEL OF DORSAL FIN (FIG. 1B)
....................CLYPEOBARBUS
4B. MIDLATERAL SCALE ROW NOT, OR ONLY SLIGHTLY, LARGER THAN SCALES OF ADJACENT ROWS (FIG. 1A) ....................BARBUS
5A. SUCTORIAL ORAL DISC PRESENT (FIG. 2D). FIRST TWO OR MORE PECTORAL FIN RAYS UNBRANCHED
....................GARRA
5B. NO SUCTORIAL ORAL DISC, SINGLE UNBRANCHED PECTORAL-
FIN RAY
....................6
6A. STRONGLY KERATINIZED CUTTING EDGE OF LOWER JAW EXPOSED BY ABSENCE OF LOWER LIP (FIG. 2C)....
VARICORHINUS
6B. MOUTH INFERIOR WITH VERY WELL-DEVELOPED LIPS AND COMPLEX LABIAL FOLDS (FIG. 2B)
....................LABEO
7A. DORSAL-FIN ORIGIN SITUATED WELL-POSTERIOR TO ORIGIN OF ANAL FIN ....................CHELAETHIOPS
7B. DORSAL-FIN ORIGIN SITUATED INFRONT OF ANAL-FIN ORIGIN
(FIG. 1C)
....................8
8A. A LONGITUDINAL STRIPE OR SERIES OF SMALL ROUND SPOTS VARIOUSLY PRESENT; WHEN PRESENT SITUATED WELL-ABOVE THE MIDLATERAL FLANK REGION (FIG. 3B)....................LEPTOCYPRIS
8B. NUMEROUS SHORT VERTICAL BARS EXTENDING DOWN OVER THE MIDLATERAL FLANK REGION (FIG. 3A) ....................9
9A. BODY ELONGATE AND SLENDER, MAXILLA USUALLY REACHING WELL-BEYOND LEVEL OF EYE CENTER, SNOUT ACUTE, ANAL FIN OF MALES NOT MARKEDLY DECURVED, TUBERCLES NOT WELL-DEVELOPED, DORSAL FIN MEMBRANE LACKING DARK MARKINGS
....................RAIAMAS
9B. BODY ROBUST, MAXILLA NOT REACHING BEYOND LEVEL OF EYE CENTER, SNOUT ROUNDED, ANAL FIN OF MALES GREATLY ENLARGED AND DECURVED, LARGE GRANULAR TUBERCLES AROUND SNOUT IN BREEDING ADULTS, DORSAL FIN WITH DARK MARKINGS BETWEEN RAYS (MOST MARKED IN MATURE MALES)....................OPSARIDIUM
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