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Occurrence of Acetes sibogae Hansen (Crustacea: Decapoda: Sergestidae) in Western Australia, with notes on the northern Australian population

Shrimps of the sergestid genus Acetes (Decapoda, Sergestidae) are distributed mainly in estuaries and coastal waters of the tropical and subtropical regions of the world (Omori 1975, 1977; Xiao and Greenwood 1993). Nevertheless, no record has been obtained from the subtropical eastern Indian Ocean. Recently, many specimens of Acetes were collected at a site in the Swan River near Perth, Western Australia. They resemble to the Australian form of A. sibogae Hansen, 1919, described originally as A. australis by Colefax (1940) from the east coast. Further analysis of these specimens and comparison with northern Australian specimens indicated that the Western Australian population belongs to A. sibogae. This record is the new addition to the Western Australian fauna and is a range extension of the genus. In the synonymy, only the important and relevant literature has been listed. Abbreviations used in the text are: cl, carapace length in millimetres; NTM, Northern Territory Museum, Darwin; WAM, Western Australian Museum, Perth.