Oxythyreus is a genus of Phymatinae. Species in this genus are known only from southern Africa.
Species include:
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Oxythyreus slateri Doesburg & Pluot-Sigwalt, 2007
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Oxythyreus ruckesi Kormilev, 1962
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Oxythyreus cylindricornis Westwood, 1841
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O. c. schuhi Doesburg & Pluot-Sigwalt, 2007