"They are hermaphrodites. The gonades consist of two testicles and an ovary ..."

Ludwig K. Schmarda: Zoologie. p. 58. 2nd ed. 1878.

WBwb comment: apparently hermaphroditic tardigrades do exist, but this is true only for a few species. Parthogenesis, i.e. solely female reproduction occurs as well, and some tardigrade populations do have males and females.

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