Abstract
Abstract A new species of the genus Siriella is described based on specimens collected from an intertidal reef area at Port Dickson, Malaysia. The species shows modified setae on both rami of both the third and fourth male pleopods and coiled pseudbranchial rami on the second to fourth male pleopods. These morphological characteristics indicate that the present species is a member of the pacifica-group of the genus Siriella. This is the first species of the group from Southeast Asian waters other than the species,”Siriella inornata Hansen?”, described by O. S. Tattersall (1960). The morphological characters of the present species are compared with those of the species of the pacifica-group, including O. S. Tattersall’s (1960) species.
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