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Riodinidae (Nemeobiidae; subclass Pterygota, order Lepidoptera) Family of small butterflies in which the wings are short and broad, generally brownish, with white or blue markings, and eye-spots near the margin of the hind wings. The forelegs are reduced in males but fully formed in females. Riodinidae are closely related to the Lycaenidae. There are about 1000 species, found mainly in tropical America.