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  • bottom of head & body flattened
    head broad, depressed
    mouth under snout
    front roof mouth - no teeth
    2-3 papillae under gill cover
    pelvics in disc
    all body scaled
  • slender, compressed
    mouth slightly oblique
    D1: usually V
    shoulder: 1-3 skin flaps
    pelvics = cup
    scales: smooth, tiny, imbedded, on body only
  • head large
    D1: IV-V
    top jaw extends onto opercle
    shoulder: 2-3 skin flaps\pelvics = disc
    scales smooth, tiny, imbedded