The present study was carried out to understand the difference in occurrence of the intertidal macrobenthic fauna in two types of ecological niches namely Dammam Corniche and Half moon bay beaches of Arabian Gulf Coast around Dammam, Eastern Province, Saudi Arabia. The different types of intertidal macrobenthic fauna: composition existing in two different areas have been discussed in relation to the temperature and salinity recorded in the respective areas of study. The present study has also revealed the influence of the substratum in the distribution and abundance of the intertidal and macrobenthic fauna in the rocky shore of Dammam Corniche and the sandy shore of Half moon bay beaches of the Arabian Gulf. Poor faunal representation has been found in the sandy shore than in the'rocky shore.

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