Sea cucumbers are important due to their rotation of key nutrients and high medicinal values. With this in mind and considering the lack of scientific knowledge about them, the purpose of this research was to identify the species of sea cucumber occurring in the intertidal habitats of Hengam Island. Field sampling and surveys were carried out along the coastline based on the geomorphic and habitat characteristics of eight sampling stations in the inter-tidal zone. The samples that were collected from the stations were transferred to the laboratory and identified using morphological keys and a review of their ossicles. By reviewing the literature on the distribution of sea cucumbers, it was determined that a new observation had been made of Holothuria arenicola and Holothuria bacilla from Hengam Island (Persian Gulf).

Sea cucumbers have many important and useful properties known for human health. In this respect and with the lack of scientific knowledge about them, this study has been conducted to identify the present species in the northern part of the Persian Gulf. Two species of sea cucumber (one belonging to the genus Holothuria and the other to Stichopus) were collected in the subtidal zone of the northern part of Qeshm Island (Persian Gulf) via SCUBA diving. The literature review on the distribution was determined to be the first report of H. sacabra and S. hermanni from Qeshm Island (Persian Gulf). The species identification was accomplished through morphological keys and review of their ossicles.