A study on the diversity of gastropods in Hormuz Island with first record of two species from the Iranian coast of the Persian Gulf

This study was carried out to determine the diversity of gastropod species in the intertidal zone of Hormuz Island in the Persian Gulf. Seasonal sampling was conducted in 7 selected sites by throwing nine random quadrates (0.5×0.5 m) in each site. Samples of each site were separately transferred to the laboratory and identified by the standard keys and verified by the Conchology Museum of Tokyo University of Science. Forty -nine gastropod species were identified, from which 2 species, Turicula nelliae and Linatella caudata were recorded for the first time from the Iranian coast of the Persian Gulf. The highest number of gastropods in one site was 28 species in site 1 (East of Marine Research Center), Also highest number of gastropods in one season was 35 species in winter and lowest number was in 28 species in summer. Simpson dominance index, Shannon-Wiener species diversity index, Margalef richness index and evenness index were calculated in the different sites and results showed that site 1 contained the most amount of the Shannon-Wiener and Margalef indices and site 6 (West of Island) contained the most amount of the Simpson index. Also, site 3 (Mangrove forest) showed the lowest amount of the Simpson, Shannon-Wiener and Margalef indices, while maximum amount of evenness index occurred in this site.