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  • snout spines < body spines
    top tail base: 2+ spines
    many large erectile spines
    D & A pointed
    body & fins: many spots
    Diodon eydouxii, Pelagic porcupinefish
  • snout spines > body spines
    tail base: no spines
    many large erectile spines
    dark bar through eye
    body - blotches, few spots; fins - no spots
    Diodon holocanthus, Long-spine balloonfish
  • snout spines < body spines
    tail base: 1-2 spines
    many large erectile spines
    body & fins spotted
    Diodon hystrix, Spot-fin porcupinefish