Synonyms: Placerobela Turner (type species brachyphylla Turner, Queensland).
This genus, and its relationship to the previous one and the next, were reviewed by Lödl (1993), and the more easterly species were discussed by Holloway (1979).
The facies is similar to that of Hypena species, but the male genitalia show significant differences. The valves lack processes and are much more elongate, as are the vinculum and tegumen, their junction obscured by a degree of fusion. The articulation of the valve with the vinculum is narrow and in an extremely ventral position. The uncus is very slender, tapering, strongly and evenly curved. There is a scaphium. The aedeagus is relatively short, without the characteristic flexure of Hypena or the spining of the anellar ring around it. The eighth segment is more elongate than in Hypena or Dichromia, and there is a heart-shaped or reniform structure at the anterior of the eighth sternite that gives rise to long setae, possibly a modification of the framed corematous condition.
The female genitalia have a funnel-like ostium leading from the anterior margin of the eighth segment into a narrow but moderate ductus bursae that expands distally into an ovate to pyriform corpus bursae. The ductus is sclerotised over its basal half. The corpus bursae is finely scobinate over at least half longitudinally; the ductus seminalis arises near its base.
All four species currently known occur in the Indo-Australian tropics to as far east as New Caledonia.
The larva of the type species is described below. Gardner (1946a) described the larva of H. nebulosa Moore (as Hypena uniformis Hampson; Gardner, 1948). It is pale green with the setae on black bases; The host plant was Indigofera (Leguminosae), also noted from other sources by Robinson et al. (2001).
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