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Thirteen species of the genus Portunus Weber are recorded from Australia, including one new species and five new records. These species are described and illustrated, and a key is given to known Indo-West-Pacific species. First pleopods of males are considered in detail and a key based on their features is included. The problems of designating subgenera are discussed and the relevance of a knowledge of the structure of first male pleopods is indicated.
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Stephenson et al. (1959) studied this question.
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