Pentarthrum is a genus of beetle in family Curculionidae. It contains about 70 species of mainly tropical distribution.
Partial list of species Pentarthrum angustissimum Wollaston, 1873 Pentarthrum blackburni Sharp, 1878 Pentarthrum halodorum Perkins, 1926 Pentarthrum huttoni Wollaston, 1854 Pentarthrum obscurum Sharp, 1878
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