This study has been conducted in order to identify the present species in the northern part of the Persian Gulf. Samples were collected on the sub tidal zone of Larak Island (Persian Gulf) via SCUBA diving in July 2011. The literature review on the distribution revealed that this is the first report of Holothuria hilla from Larak Island. The species identification was made using morphological keys and review of their ossicles.

In Iran, sea cucumbers are not well known and they are not consumed as food. With this and the lack of scientific knowledge about them, this study has been conducted in order to identify the present species in the northern part of the Persian Gulf. Samples were collected in the sub-tidal zone of Larak Island (Persian Gulf) via SCUBA diving in August 2011. The literature review on the distribution revealed that this is the first report of Holothuria impatiens from Larak Island (Persian Gulf). The species identification was made using morphological keys and review of their ossicles.

Three species of hard corals including Echinopora gemmaceaLeptoria irregularis (Faviidae) and Montipora incrassata (Acroporidae) were recorded for the first time from north-east of Larak Island in the Strait of Hurmoz, Persian Gulf in late 2008. The review of previous studies revealed that these species were new reports from Larak Island situated in the northern Persian Gulf. Of these species only Echinopora gemmacea has previously been reported from the Oman Sea. No evidence of Leptoria irregularis and Montipora incrassata has been reported from the southern Persian Gulf and Oman Sea.