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Nycteola Hübner

Type species: undulana Hübner (= revayana Scopoli), Europe.

Axia Hübner (type species revayana Scopoli, E. Germany); Dufayella Capuse (type species asiatica Krulikovsky); Icasma Turner (type species minutum Turner, Australia); Sarrothripus Curtis (type species degenerana Hübner, Europe); Subrita Walker (type species bilineatella Walker = revayana Scopoli, India); Symitha Walker (type species nolalella Walker, Java) syn. n.

The forewings are narrow, grey, with a variety of markings much as in the Bornean species illustrated. The venation is typically of the groundplan type, but with M3 and CuA1 stalked in the hindwing. In Symitha the hindwing veins at the posterior angle of the cell are reduced to three, and the forewing areole is lost, the radial sector branching being (R2 (R3, R4)); however, it is brought into synonymy with Nycteola on the grounds of shared features of the male abdomen.

The male abdomen lacks tymbals, but the eighth segment has apodemes, and carinae have been noted on the genitalia of Bornean N.
sinuosa Moore (valves; Fig. 182) and N. indicatana Walker (tegumen; Fig. 180). The uncus is broad, often square-ended, with a slight gnathus forming a tube that encloses the anus. The tegumen extends well below the junction with the vinculum and is massively expanded each side to support a dark pad giving rise to a dense mass of hairs. The vinculum is slender but extended in an elliptical to rectangular loop in which the very long saccular shield is conspicuous, expanding at the apex rather like an axe-head. The aedeagus is usually slender and may be partially fused to the saccular shield. Cornuti in the vesica can be present, usually just a single one (e.g. in diplographa Hampson from S. India). The valves are complex, convolute, with several lobes that bear arrays of setae; these setae can be broad, blade-like.


The female genitalia usually have triangular to acute ovipositor lobes, but the ductus and bursa show great variety of structure.

Larval characteristics are shared with
Etanna and allies as indicated and by Gardner (1948a)

Host records in temperate regions are often from Fagaceae and Salicaceae (e.g. Sugi, 1987), but some preference for Myrtaceae is evident in the species discussed below.

The genus is widespread in the Old World and extends to the Nearctic and then south to Costa Rica.

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