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1A. PREPELVIC SCUTES ABSENT, OR IF PRESENT LACKING WELL-DEVELOPED BONY KEELS (FIG. 1B,C)....................2
1B. PREPELVIC SCUTES WELL-DEVELOPED, WITH BONY KEELS (FIG. 1A)....................3
2A. PREPELVIC SCUTES PRESENT BUT LACKING KEELS (FIG. 1B) AND OFTEN OBSCURED BY SCALES, POSTPELVIC SCUTES WITHOUT ASCENDING ARMS AND WITH MEMBRANEOUS KEELS (FIG. 1B), 21-26 GILL RAKERS ON LOWER LIMB OF FIRST ARCH....................LAEVSCUTELLA
2B. PREPELVIC AND POSTPELVIC SCUTES ABSENT (FIG. 1C), AND BELLY ROUNDED, 10-12 GILL RAKERS ON LOWER LIMB OF FIRST ARCH....................CONGOTHRISSA
3A. PREMAXILLA TOOTHLESS, PELVIC FIN i,6....................NANNOTHRISSA
3B. TEETH ON PREMAXILLA....................4
4A. LARGE, BACKWARDLY DIRECTED, CANINES INTERSPERSED WITH SMALL CANINES (FIG. 2A) ON BOTH JAWS....................ODAXOTHRISSA
4B. TEETH ON JAWS OR MORE-OR-LESS EQUAL SIZE, WITH NO ENLARGED CANINES INTERSPERSED (FIG. 2B)....................5
5A. MAXILLARY BLADE DEEP, WITHOUT A LATERAL RIDGE (FIG. 2C), TEETH ON PREMAXILLA RELATIVELY ROBUST CANINES, SOMETIMES ENLARGED ANTERIORLY, 2ND SUPRAMAXILLA RELATIVELY LARGE....................PELLONULA
5B. MAXILLARY BLADE SLENDER, WITH A MARKED LATERAL RIDGE (FIG. 2D), TEETH ON PREMAXILLA SMALL UNICUSPIDS, 2ND SUPRAMAXILLA REDUCED IN SIZE....................6
6A. SMALL TEETH ALONG LENGTH OF LOWER JAW, LOWER JAW ELONGATE, NOT RISING STEEPLY POSTERIORLY IN MOUTH (FIG. 3B), MAXILLA EDENTATE, DORSAL FIN INSERTION A LITTLE INFRONT OF PELVIC FINS....................POTAMOTHRISSA
6B. TEETH ON LOWER JAW LIMITED TO SYMPHYSIAL REGION, LOWER JAW SHORT AND DEEP, RISING STEEPLY POSTERIORLY IN MOUTH (FIG. 3A), TEETH USUALLY PRESENT ON MAXILLA (FIG. 2C), DORSAL FIN INSERTED ABOVE OR JUST BEHIND PELVIC FINS....................7
7A. DEEP-BODIED AND STRONGLY LATERALLY COMPRESSED, 35-45 LONGITUDINAL SCALES, ANAL FIN LONG WITH 20-27 BRANCHED RAYS....................MICROTHRISSA MICROTHRISSA
7B. RELATIVELY GRACILE AND SOMEWHAT ROUNDED, 26-35 SCALES IN LONGITUDINAL SERIES, ANAL FIN WITH 15-22 BRANCHED RAYS....................MICROTHRISSA POECILOTHRISSA
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