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  • body: covered with bony rings
    fins no spines
    no pelvics
  • elongate, ~ cylindrical
    D XXIV-XXVII isolated spines
    D2 & A small, at rear
    mouth small, at end long, flexible tube
    no scales
  • boy elongate, compressed
    D1: VIII-XIII isolated spines
    C round
    chin barbel
  • body elongate, square
    D no spines
    C: + long filament
    chin - no barbel