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Sabussowia dioica is a gonochoric free-living flatworm that is an exception in the Plathelminthes phylum, where hermaphroditism is the rule. Very little is known about its biology. This work presents, for the first time, a description using light and electron microscopy of all aspects of its reproduction: gametogenesis, fertilisation, oviposition and development. Spermatogenesis in rosettes and the structure of the filiform and biflagellate spermatozoon are consistent with the Plathelminthe model. The heterocellular female gonad has 2 ovaries and numerous vitellogenic glands. Oocytes...