Fig. 1
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Fig. 2
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1A LOWER LIP AND BARBELS MODIFIED INTO ORAL SUCKER (FIG. 1A,B), CLEITHRAL PROCESS SMALL, 5 INFRAORBITALS ........................ 2
1B LOWER LIP AND BARBELS NOT MODIFIED INTO ORAL SUCKER (FIG. 1C), CLEITHRAL PROCESS LARGE (FIG. 2), 4 INFRAORBITALS ...............................4
2A EYES WITHOUT FREE BORDER (FIG. 2A), NO MANDIBULAR SENSORY-CANAL PORES, MANDIBULAR TEETH IN A BUNCH (FIG. 1A) OR IN 1-2 DISCRETE ROWS, S-SHAPED TEETH ON DENTARY POINTED ..................................CHILOGLANIS
2B EYES WITH FREE BORDER (FIG. 2B), 4 MANDIBULAR SENSORY-CANAL PORES, MANDIBULAR TEETH IN 2 OR MORE DISCRETE ROWS (FIG. 1B), S-SHAPED TEETH ON DENTARY SPATULATE OR SHOVEL-SHAPED...............................3
3A PECTORAL SPINE STRONGLY SERRATE ALONG POSTERIOR
MARGIN (FIG. 1B), SPATULATE UNICUSPID MANDIBULAR TEETH, FEW CEPHALIC SENSORY CANAL PORES
...............................ATOPOCHILUS
3B PECTORAL SPINE WEAKLY SERRATE ON POSTERIOR MARGIN (FIG. 1C), MANDIBULAR TEETH SHOVEL-SHAPED AND SOMETIMES BICUSPID FROM WEAR, MULTIPLE CEPHALIC SENSORY CANAL PORES .........................EUCHILICHTHYS
4A S-SHAPED TEETH ON DENTARY, PREMAXILLARY TEETH DIFFER IN SIZE AND SHAPE FROM FRONT TO BACK, HEAD AND NUCHAL SHIELD WITHOUT RIDGES AND PROJECTIONS, CLEITHRUM WITHOUT SPINE IN MALES ...............................5
4B NO S-SHAPED TEETH ON DENTARY, PREMAXILLARY TEETH WITH LITTLE DIFFERENCE IN SIZE AND SHAPE FROM FRONT TO BACK, HEAD AND NUCHAL SHIELD WITH RIDGES AND PROJECTIONS, CLEITHRUM WITH SPINE(S) IN MALES ...............................
ACANTHOCLEITHRON
5A EYES WITH FREE BORDER (FIG. 2B), CAUDAL FIN FORKED (FIG. 2B), 7-9 (USUALLY 8) PECTORAL FIN RAYS, 8-80 CM TL ...............................SYNODONTIS
5B EYES WITHOUT FREE BORDER (FIG. 2A), CAUDAL FIN TRUNCATE OR ROUNDED (FIG. 2A), 6-7 (USUALLY 6) PECTORAL-FIN RAYS. USUALLY LESS THAN 8 CM TL ...............................MICROSYNODONTIS
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