Abstract
Ophryotrocha diadema is a simultaneous hermaphroditic worm whose peculiar mating system involves forming pairs within which partners exchange eggs repeatedly in a kind of serial monogamy. To test whether direct recognition of the former partner exists in this species we checked whether two familiar partners, after a short separation, spawned again without engaging in a new courtship. In contrast, non-familiar partners were expected to invest a longer time in courtship before spawning again. Results indicate that no direct individual recognition of a former mate exists and that only indirect cues are used to identify former partners.
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