Abstract
This paper describes Volvatella vigourouxi (Montrouzier, 1861) (Opisthobranchia: Sacoglossa: Volvatellidae) as a species newly recorded to Taiwan. It was a small snail with body lengths of 4.97 mm to 9.31 mm. It inhabited on coral reefs in the coastal intertidal zone of Chai-shan, Kaohsiung and fed on green algae, Caulerpa sertularioides (Gmelin) Howe, 1905. Although it was a hermaphroditic animal, testes became mature at earlier ages than ovaries, so that the sizes of individuals less than 6 mm were found to be males, and larger than 7 mm were females. In copulation the small male mounted on the top of the large female. When attacked, it secreted white mucus and crawled away.
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