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  • disc heart-shaped
    snout long, with filament
    tail thin, no Ds
    pelvics: front lobe separate, = leg
  • disk diamond shaped
    snout flexible, medium, no filament
    tail thick, 2 Ds
    pelvics: front lobe = leg
  • disc - soft edges
    electric organs behind eyes
    D1 = D2
    mouth tubular, protractile
  • rhomboidal disc
    2 small Ds, near end narrow tail
    C = small skin fold after D2
    pelvic 2 lobes
  • disc - thick edges
    electric organs - sides of head
    D1 > D2
    mouth not tubular