Opalimosina is a subgenus of flies belonging to the family Sphaeroceridae.

Species O. australis Hayashi, 2009 O. calcarifera (Roháček, 1975) O. collini (Richards, 1929) O. dolichodasys Hayashi, 2010 O. mirabilis (Collin, 1902) O. monticola Hayashi, 2010 O. pseudomirabilis Hayashi, 1989 O. simplex (Richards, 1929) O. spathulata Hayashi, 2010 O. stepheni Papp, 1991

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