Fig. 1
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Fig. 2
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Fig. 3
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Fig. 4
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Fig. 5
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Fig. 6
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Fig. 7
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1A. UPPER AND LOWER JAW TEETH IN A SINGLE ROW WITH ELONGATE CONICAL TEETH OVERLAPPING LIP ANTERIORLY (FIG. 1A), FIRST AND SECOND INFRAORBITALS ENLARGED AND COVERING MOST OF PREMAXILLA AND MAXILLA (FIG. 1A)........................HYDROCYNUS
1B. TEETH NOT ENLARGED ANTERIORLY (FIG.1A,B), MAXILLA EXPOSED LATERALLY
(FIG. 1B,C)....................2
2A. ADIPOSE EYELID WELL-DEVELOPED AND COVERING MOST OF EYE (FIG. 1A,B)....................3
2B. ADIPOSE EYELID ABSENT OR POORLY DEVELOPED, NEVER COVERING EYE
(FIG. 1C)....................4
3A. THREE ROWS OF TEETH ON PREMAXILLA (FIG. 2C), LATERAL LINE POSITIONED CLOSE TO MIDLINE ON BODY (FIG. 3A)....................BRYCONAETHIOPS
3B. TWO ROWS OF TEETH ON PREMAXILLA (FIG. 2A), LATERAL
LINE POSITIONED BELOW MIDLINE ON BODY (FIG. 3B)....................ALESTES
4A. TEETH MULTICUSPIDATE, INNER ROW PREMAXILLARY TEETH
BROAD AND MOLARIFORM WITH A DOUBLE CUTTING EDGE
(FIG. 2A)....................5
4B. TEETH MULTICUSPIDATE, INNER ROW PREMAXILLARY TEETH
NARROW, NEVER MOLARIFORM AND WITH A SINGLE CUTTING EDGE
(FIG. 2B)....................6
5A. THIRD TOOTH OF INNER PREMAXILLARY ROW EXPANDED
POSTEROMEDIALLY (FIG. 2A,C), NO TRIANGULAR EXTENSION ON BASAL PORTION OF ANAL FIN RAYS (FIG. 4A)....................BRYCINUS
5B. THIRD TOOTH OF INNER PREMAXILLARY ROW NOT EXPANDED, TRIANGULAR EXTENSIONS ON BASAL PORTION OF MIDDLE ANAL FIN RAYS (FIG. 4B)....................BRYCONALESTES
6A. TWO INNER ROW TEETH AT SYMPHYSIS OF DENTARY (FIG. 5A), (NB: THESE TEETH CAN BE EXTREMELY SMALL)....................7
6B. NO INNER ROW TEETH ON DENTARY (FIG. 5B)....................11
7A. THREE OR MORE TEETH IN OUTER ROW ON PREMAXILLAE
(SIX OR MORE IN TOTAL)....................MICRALESTES
7B. TWO TEETH IN OUTER ROW ON PREMAXILLAE
(FOUR IN TOTAL)....................8
8A. LATERAL LINE CAUDALLY ABBREVIATED (FIG. 6A) OR INCOMPLETE
(FIG. 6C)....................9
8B. LATERAL LINE COMPLETE (FIG. 6B)....................10
9A. VERY DEEP-BODIED AND LATERALLY COMPRESSED, LATERAL
LINE USUALLY ABBREVIATED CAUDALLY (FIG. 6A), PROMINENT
BLACK SPOT ON CAUDAL PEDUNCLE (FIG. 6A)....................BATHYAETHIOPS
9B. LATERAL LINE INCOMPLETE WITH FEWER THAN 15 PORED SCALES ON ANTERIOR FLANKS (FIG. 6C), NO BLACK CAUDAL SPOT....................PHENACOGRAMMUS
10A. FEWER THAN 6 SCALES IN TRANSVERSE ROW BETWEEN
LATERAL LINE AND DORSAL FIN ORIGIN (FIG. 7A)....................BRACHYPETERSIUS
10B. SIX OR MORE SCALES IN TRANSVERSE ROW BETWEEN
LATERAL LINE AND DORSAL FIN ORIGIN (FIG. 7B)....................NANNOPETERSIUS
11A. INNER ROW PREMAXILLARY TEETH AND TEETH ON DENTARY
WITH NUMEROUS (8 TO 14) SMALL CUSPS, MEDIAN CUSPS NOT
MARKEDLY LARGER THAN LATERAL CUSPS, DORSAL FIN NOT FILAMENTOUS....................DUBOISIALESTES
11B. INNER ROW PREMAXILLARY TEETH AND TEETH ON DENTARY
WITH FEWER (3 TO 8) CUSPS, MEDIAN CUSPS MARKEDLY
LARGER THAN LATERAL CUSPS, DORSAL FIN USUALLY FILAMENTOUS (FIG. 3A)....................ALESTOPETERSIUS
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