Monotrysia (Börner, 1939) The Monotrysia are a group of moths in the lepidopteran order, not currently considered to be a natural group or clade.

[1] The group is so named because the female has a single genital opening for mating and laying eggs, in contrast to the rest of the Lepidoptera (Ditrysia), which have two female reproductive openings.

[1][2] Later classifications used Monotrysia in a narrower sense for the nonditrysian Heteroneura, but this group was also found to be paraphyletic with respect to Ditrysia.

[1][3] Apart from the recently discovered family Andesianidae,[3][4] most of the group consists of small, relatively understudied species.

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