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Japetella diaphana reaches about twice the length of Bolitaena pygmaea and has larger eyes. The third arms of the male have slightly enlarged suckers, but no trace of a ligula has been found. No fully mature male, however, has ever been captured.

Brief diagnosis:

A bolitaenid ...

  • without a hectocotylus (ie, neither arm III with a ligula).
  • with relatively large eyes on short optic stalks.


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