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  • spines: immovable, short
    snout to D: ~ 8-10 spines
    top of tail base: 1-2 spines
    adult nasal organ: open cup with 2 holes
  • spines: immovable, short
    snout to D: ~ 15 spines
    tail base without spines
    nasal organ: short tube with 2 openings
  • spines: erectile, long, many
    nasal organ: flat tube with 2 holes