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  • slender body, narrow head
    snout long, pointed
    D1 > D2; D1 spine < D2 spine
    D1 low, behind pectoral
    sides - white spots
    Squalus acanthias, Pike dogfish shark, Pike dogfish, Spiny dogfish
    pectorals - concave rear, round rear tip
    C - no notch below top tip, deep notch between lobes
  • slender
    head and snout broad
    D1 spine short, origin over pectoral base
    D2 small
    D tips and notch of C dusky
    edges of pectoral, pelvic and C white
    Squalus clarkae, Shortspine spurdog shark, Shortspine dogfish
    pectoral rear edge weakly concave, free tip blunt point
    flank denticles - 3 points
  • slender
    D1 spine before pectoral free tip
    D spines long, slender
    Ds tips black; pectoral & anal edges white
    Squalus cubensis, Cuban dogfish shark, Cuban dogfish
    flank denticles - 1 point
    pectoral rear edge very concave, free tip sharply pointed