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Orthorrhapha là một circumscriptional name which historically was used for an infraorder của Brachycera, one of the two suborders into which the order Diptera, the flies, are divided. As the group was paraphyletic, it has not been used in classifications in the last decade, và is effectively obsolete. However, many catalogs, checklists, và older works still contain the name. The taxa that used to be in the Orthorrhapha now comprise all of the infraorders in Brachycera excluding the Muscomorpha (= "Cyclorrhapha").