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  • long snout
    D 26-48
    side body ridge straight, ends over anus
    lower body & tail ridges joined
    operculum - no longitudinal ridge
    brood pouch under tail
    A: 2-4
    large C
  • elongate, ~ cylindrical
    D XXIV-XXVII isolated spines
    D2 & A small, at rear
    mouth small, at end long, flexible tube
    no scales
  • D 21-33
    side body ridge straight, ends ~ over anus
    lower body & tail ridges joined
    operculum with longitudinal ridge
    brood pouch under tail
    no A
    C small
  • skin flaps near eye, on body
    D 16-30
    side body ridge straight, ends over anus
    lower body & tail ridges joined
    longitudinal ridge on operculum
    brood pouch under tail
    A: 2-4
    C: small
  • snout long
    D 16-30
    side body ridge joins lower tail ridge
    lower body ridge ends at A
    operculum with ridge
    brood pouch under trunk
    A: 4
    C: large
  • snout very long, slender
    D 25-74
    side body ridge joins lower tail ridge
    lower body ridge ends at A
    operculum ridges: 1 longitudinal, several oblique
    brood pouch under trunk
    A: tiny, 4
    C: small, 9