The neogobiine fishes Chasar bathybius, Mesogobius nonultimus, Neogobius caspius and Neogobius syrman are reported from the Caspian Basin of Iran. These four gobiid species are rarely found in the southern part of the Caspian Sea. In this study the first documented records of these species are presented for Iran.
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Ahnelt et al. (2007) studied this question.