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  • snout square, slightly overhanging
    bone behind head shield- slender or square + spine
    D base plate - large saddle, notch at front
    NO transverse skin flap between nostrils
    2 pr tooth patches, fused into U, rear patches notched
    gill rakers 15-18
  • front & rear nostrils well separated
    D spine - base swollen
    top lip barbel long, in groove under eye
    chin: 2 pr barbels
    roof mouth - no teeth
    LL undulating, blue & white
  • bone behind headshield- broad base, tapering, convex above
    plate before D - large saddle
    abruptly white below
    transverse skin flap between nostrils
    roof mouth: 2 pr tooth patches fused in U
    gill rakers- 2nd arch 19-20
  • snout long, rounded
    bone behind head shield- broad base, tapering, kee
    plate before D - short crescent
    transverse skin flap between nostrils
    roof mouth: 2 pr tooth patches, fused to form U
    gill rakers- 2nd arch 19-26
  • head flat; snout v short
    bone behind head shield- broad base, convex above, short, < D base-plate
    plate before D - large saddle, no front notch
    yellow
    NO transverse skin flap between nostrils
    2 pr tooth patches, fused into U
    gill rakers- 2nd arch 19-21
  • snout short, not overhanging
    bone behind head shield- broad base, tapering, keeled
    plate before D - small saddle
    transverse skin flap between nostrils
    roof mouth: 2 pr tooth patches, fused in narrow cross band
    gill rakers- 19-21