Alpheus edwardsii is an Indo-West Pacific snapping shrimp that belongs to the Edwardsii species group within the genus Alpheus. Alpheus edwardsii commonly lives in pairs in the intertidal; Ming-Shiou (1994) found that the antennular flagellum plays an important role in pairing behavior in this species. For more details, see ABRS (2009): http://www.environment.gov.au/biodiversity/abrs/online-resources/fauna/a....