Many species of Oxysarcodexia, one of the most numerous neotropical genera of the family Sarcophagidae, are known only by descriptions which do not supply enough arguments for species segregation, mainly by the lack of detailed morphological study of the genitalia. A comparative and elaborate study of the male terminalia of O. avuncula, O. confusa, O. diana and O. parva, species with very similar morphology, has resulted in the survey of a character set which has allowed the species segregation.
