Porphyrosela alternata is a moth of the family Gracillariidae. It is known from Japan (the island of Kyūshū), Malaysia (the states of Pahang and Selangor), Nepal and Taiwan.Global Taxonomic Database of Gracillariidae (Lepidoptera) This species is a well-known pest of cotton.
The wingspan is 2.6-4.3 mm.
The larvae feed on Desmodium species, including Desmodium heterocarpon, Desmodium heterophyllum and Desmodium strigillosum. They mine the leaves of their host plant.
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