Ectinosomatid species inhabiting in interstitial habitats of Mediterranean Sea coast of Turkey were investigated. Samples were collected from a total of 89 localities from the beaches between Samandag (Hatay) and Esen River (Antalya). Nine ectinosomatid species (Ectinosoma soyeri, E. melaniceps, E. reductum, Halectinosoma herdmani, Microsetella norvegica, M. rosea, Hastigerella bodini, H. bozici, Arenosetella germanica) which belong to five genera were identified. Four species; Ectinosoma reductum, Halectinosoma herdmani, Microsatella rosea and Hastigerella bozici are recorded for the first time from Turkish marine waters