Ditrysia

Ditrysia
Kamehameha
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Clade:	Myoglossata
Clade:	Neolepidoptera
Infraorder:	Heteroneura
Clade:	Eulepidoptera
Clade:	Ditrysia Borner, 1925
Principal clades and superfamilies
Simaethistoidea Tineoidea Gracillarioidea Yponomeutoidea Gelechioidea Apoditrysia Galacticoidea Zygaenoidea Cossoidea Sesioidea Choreutoidea Tortricoidea Urodoidea Schreckensteinioidea Epermenioidea Alucitoidea Pterophoroidea Obtectomera Whalleyanoidea Immoidea Copromorphoidea Hyblaeoidea Pyraloidea Thyridoidea Macrolepidoptera Mimallonoidea Lasiocampoidea Bombycoidea Noctuoidea Drepanoidea Geometroidea Axioidea Calliduloidea Rhopalocera Hedyloidea Papilionoidea

The Ditrysia are a natural group or clade of insects in the Lepidopteran order containing both butterflies and moths. They are so named because the female has two distinct sexual openings: one for mating, and the other for laying eggs (in contrast to the Monotrysia).

About 98% of described species of Lepidoptera belong to Ditrysia. The group can be divided into the primitive but paraphyletic "micromoths" and the derived monophyletic Apoditrysia, which include mostly larger moths, as well as the butterflies. Those with a dorsal heart vessel belong in section Cossina. Others, having a ventral heart vessel, belong in section Tineina.

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