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nostrils: front tubular, rear in mouthD origin over/behind anustail tip flexible, C obviousroof mouth - no teethlarge pectoral
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1 pore behind eyeD origin behind gill opening by 1-2X pectoral lengthroof of mouth: teeth in 1 row
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1 pore behind eyeD origin behind gill opening by > 3 X pectoral lengthroof of mouth: 2-3 rows teeth