Abstract
Chelidonura amoena Bergh, 1905 is redescribed, principally on material from Australia. The single extant type specimen is designated as lectotype. Considerable intraspecific colour variation is evident, with that relating to the caudal lobes being greatest. The variation in coloration and shape observed in one specimen from Belau lies outside those described for C. amoena and we believe it could be explained as the product of hybridisation with C. electra Rudman, 1970. Aggregation for the purpose of breeding is shown to be normal for C. amoena. The collection data and observations indicate C. amoena is widely distributed in the tropical western Pacific and eastern Indian Oceans with disparate limits on the eastern and western coasts of the Australian continent.
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