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bone behind head shield- narrower at base, sides straight to convex
snout pointedplate before D: chevron/crescent shapedroof mouth: 2 pr tooth patches, central patches smallgill rakers 13-17 -
bone behind head shield - narrow, keeledplate before D- narrow crescentmouth wide, lips thick
roof mouth: 2 pr tooth patches form a U, inner slightly separated, touch outergill rakers 13-14 -
bone behind head shield- long, narrow, taperingplate before D - narrow crescentroof mouth: 1 pr tooth patches - small, eliptical, widely separatedgill rakers 12-15
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bone behind head shield- broad base, taperingplate before D- narrow crescentroof mouth: 1 pr tooth patches - elliptical/round, well separatedgill rakers 14-17