A map of the Arabian Sea and Indian Ocean showing the definition of ecoregions and provinces according to Spalding et al. (2007). The distribution records of Chthamalus barnesi and Tetraclita ehsani in the Persian Gulf, Gulf of Oman (Shahdadi and Sari 2011, Shahdadi et al. 2011), and in Gujarat (present study) are also plotted B map of Gujarat showing the sampling locations of barnacles collected in the present study C sandstone rocky intertidal at Diu, Gujarat D mangroves are common habitats in Gujarat and with Amphibalanus amphitrite on rocks E traditional Indian fish markets, where decapods with barnacles can be collected from the bulk by-catches gathered by fishermen.