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  • Disc round/oval
    top disc: many small denticles
    head not elevated
    mouth: papillae on floor, many tooth rows
  • disc flat, angular/round, width <1.3 X length
    no Ds
    tail slender, >> disc; no C
    nasal curtain rear edge - fringed
    floor mouth - papillae
  • disc rhomboidal, width >> length
    no Ds
    tail << disc, slender; no C
  • round flat disc
    no Ds
    tail: =/> disc, + spine(s), with C