Josifov & Kerzhner (1967) actually listed S. angustus Jakovlev (1903) as a junior synonym, but as pointed out by Derzhansky (1994), this was a lapsus for S. agnatus Jakovlev (1903).
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Josifov & Kerzhner (1967) actually listed S. angustus Jakovlev (1903) as a junior synonym, but as pointed out by Derzhansky (1994), this was a lapsus for S. agnatus Jakovlev (1903).
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