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  • front & rear nostrils wide apart
    D1 II spines, 1st v short, 2nd strong
    D2 flap present
    barbells: top jaw - 1 pr, chin 2 pr
    LL complete, straight, not forked
    A short base
  • front & rear nostrils close-set
    D1 I strong spine, base not swollen
    D2 flap present
    barbells: top jaw 1 pr, chin 1-2 pr
    pectoral: large spine
    LL straight, forked
  • body whip-like
    D1 - I weak spine
    no D2
    barbels: top lips 1 pr, under head & chest 2-10 pr
    gill opening = tiny slit
    A v long base
  • front & rear nostrils wide apart
    D1 I strong spine, base swollen
    D2 flap present
    barbells: top jaw - 1 pr (in groove under eyes), chin 2 pr
    A long base
    LL wavy, forked at end