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  • eye crest ends abruptly
    deeply concave between eyes
    no clear bar between eyes
    body spots < 1/3 eye
    D1 origin over pectoral base
    skin denticles small, smooth
    Heterodontus francisci, Pacific horn shark, Horn shark
  • eye crest ends gradually
    weakly concave between eyes
    pale bar between eyes
    body spots > 1/2 eye
    D1 origin over pectoral
    skin denticles large, rough
    Heterodontus mexicanus, Mexican horn shark
  • low crest over eye
    body spots > 1/2 eye
    no light bar between eyes
    D1 origin behind pectoral base, over internal margin
    Heterodontus quoyi, Galapagos bullhead shark