Cyrea castelnaudii is a species of beetle of the family Coccinellidae. It is found in Brazil.

Description Adults reach a length of about 2.2 mm. They have a dark brown body. The pronotum is however, is reddish brown. The elytron is light brownish yellow with one large dark brown spot.South American Coccinellidae (Coleoptera), Part XVII: Systematic revision of the genera Cyrea Gordon and Canepari and Tiphysa Mulsant (Hyperaspidinae: Brachiacanthini)

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