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  • rhomboidal disc
    2 small Ds, near end narrow tail
    C = small skin fold after D2
    pelvic 2 lobes
  • disc heart-shaped
    snout long, with filament
    tail thin, no Ds
    pelvics: front lobe separate, = leg
  • snout, short, soft, flexible
    pectorals fused to head
    tail slender
    pelvics usually = 2 separate lobes
  • disk diamond shaped
    snout flexible, medium, no filament
    tail thick, 2 Ds
    pelvics: front lobe = leg
  • 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 - soft edges
    electric organs behind eyes
    D1 = D2
    mouth tubular, protractile
  • disc - thick edges
    electric organs - sides of head
    D1 > D2
    mouth not tubular
  • round flat disc
    no Ds
    tail: =/> disc, + spine(s), with C