Unassigned, possibly plesiomorphic genera
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Diduga Moore

Type species: costata Moore, Sri Lanka. 

Synonym: Androstigma Hampson (type species albicosta Hampson, India).

Diduga species are all small, either with medium brown forewings that have darker fasciae and stigmata, or uniform black brown with white or yellowish margins along the costa and distally. The forewings have a complete set of veins arising from the cell, only (R4, R5) stalked, the rest independent, R1 to R3 all extending to the costal margin (Fig 7c, d). In the hindwing, Rs and M1 are stalked, M2 lost and the rest independent. The male antennae vary from ciliate to bipectinate. There are often various hair pencils and androconial tufts on the wings of males.

Fig 7c: Diduga pectinifer Hampson

Fig 7d: Diduga trichophora Hampson

The male abdomen has the eighth tergite narrowed, with long, slender apodemes. The intersegmental membrane between it and the genitalia has narrow but long lateral hair pencils in many species. The valves have diverse structure but are usually either simple, long, slender, tapering, or short with several distinct processes, sometimes with bilateral asymmetry.

The female genitalia are similarly variable, the ductus and bursa ranging considerably in length.

The genus extends from the Indian Subregion and Taiwan to the Philippines, Sulawesi, Alor and Sumbawa, with an outlying white species, albida Hampson, in New Guinea. The genus is particularly diverse in Borneo. The type species is not a synonym of flavicostata Snellen (Java, ?Alor) as indicated by Hampson (1900), but distinct.

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