The family Gobiidae is the largest fish family in the Turkish marine waters with 48 species (9.2% of the total marine ichthyofauna) (Bilecenoğlu, Kaya, Cihangir, & Çiçek, 2014; Engin, Irmak, Seyhan, Akdemir, & Keskin, 2016). Recently, 33 gobiid fish species were verified in the north-eastern area of the Aegean Sea (Engin et al., 2016). The genus Speleogobius is represented by two species: Speleogobius trigloides Zander & Jelinek, 1976 and the recently ­described Speleogobius llorisi Kovačić, Ordines and Schliewen, 2016. The present study represents new information on the range extension and morphological features of the Speleogobius species reported from the Aegean Sea.