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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1A. MAXILLA LARGER AND MOBILE (FIG. 1A), PREMAXILLA NOT,
OR ONLY WEAKLY, MOBILE (FIG. 1C)....................2
1B. MAXILLA VERY SMALL AND IMMOVEABLY BOUND TO PREMAXILLA (FIG. 1B), PREMAXILLA MOBILE AND PIVOTING VERTICALLY (FIG 1D)....................6
2A. JAWS WITH TWO OR MORE TOOTH ROWS....................3
2B. JAWS WITH A SINGLE TOOTH ROW....................5
3A. SCALES PORED ALONG LATERAL LINE ONLY ANTERIORLY
ON BODY (FIG. 2A)....................NEOLEBIAS
3B. LATERAL LINE SCALES PORED OVER ENTIRE LENGTH (FIG. 2B)....................4
4A. MAXILLA WITHOUT TEETH, LOWER JAW WITH MOBILE JOINT BETWEEN DENTARY AND ANGULO-ARTICULAR (FIG. 3), BODY USUALLY DEEP AND COMPRESSED....................DISTICHODUS
4B. MAXILLA WITH SOME TEETH AT JUNCTION WITH
PREMAXILLA (FIG. 1A), LOWER JAW WITHOUT INTERNAL
MOBILITY, BODY NOT MARKEDLY COMPRESSED AND WITH A WELL-MARKED MIDLATERAL BLACK BAND PASSING FROM ORBIT TO POSTERIOR MARGIN OF CAUDAL FIN....................NANAETHIOPS
5A. SCALES PORED ALONG LATERAL LINE ONLY ANTERIORLY
ON BODY (FIG. 2A)....................HEMIGRAMMOCHARAX
5B. LATERAL LINE SCALES PORED OVER ENTIRE LENGTH (FIG. 2B)....................NANNOCHARAX
6A. SCALES LARGE AND HARD, ENCASING BODY IN PLATE-
LIKE ARMOUR (FIG. 4A)....................7
6B. SCALES SMALL, NOT HARD OR PLATE-LIKE (FIG. 4B)....................8
7A. SNOUT ABOUT SAME LENGTH AS POSTORBITAL REGION, 45-50 SCALES IN LONGITUDINAL SERIES....................PHAGO
7B. SNOUT LONGER THAN POSTORBITAL REGION, 26-30 SCALES IN LONGITUDINAL SERIES ....................BELANOPHAGO
8A. LATERAL LINE SCALES PORED ANTERIORLY AND
POSTERIORLY BUT NOT MEDIALLY (FIG. 2C), SINGLE ROW OF TEETH IN BOTH JAWS....................HEMISTICHODUS
8B. LATERAL LINE SCALES PORED OVER ENTIRE LENGTH (FIG. 2B)....................9
9A. ALL PREMAXILLARY TEETH OF MORE-OR-LESS EQUAL SIZE WITH NO ANTERIOR FANG-LIKE CANINES, SNOUT ANTERIORLY BLUNT AND ROUNDED (FIG. 4B)....................EUGNATHICHTHYS
9B. ANTERIOR PREMAXILLARY TEETH ENLARGED AND FANG-LIKE, SNOUT TUBULAR OR ACUTELY POINTED (FIG. 5)....................10
10A. SNOUT ACUTELY POINTED ANTERIORLY (FIG. 5A), COLOR PATTERN DOMINATED BY LARGE IRREGULAR BLOTCHES AND ROUNDED SPOTS....................MESOBORUS
10B. SNOUT TUBULAR AND ELONGATE (FIG. 5B), COLOR PATTERN DOMINATED BY CONTRASTING DARK AND LIGHT LONGITUDINAL BANDS....................ICHTHYBORUS
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