Megalorhipida pseudodefectalis is a species of moth in the genus Megalorhipida, known from Argentina, Brazil, Chile, and Paraguay. Its hostplants are Eupatorium betonicaeforme, Barrosoa betonicaeformis, and Senecio oleosus. Moths in this species take flight in February, March, and December, and have a wingspan of 15-18 millimetres.