Gymnoxenisthmus tigrellus, is a species of family Xenisthmidae, regarded as a synonym of the Eleotridae.[1] This species is endemic to Red Sea occurring near an unnamed island in Farasan Archipelago, Red Sea, Saudi Arabia where it is found on a narrow reef flat at 8m (26feet) depth. the area consisting of a sandy slope with patches of corals and near a rock face of 3m (10feet) in height which had small caves and rock shelters. This species is the only known member of its genus.[2]