Walker, 1863, List Specimens lepid. Insects Colln Br. Mus., 26: 1631.
Diagnosis. O. basisparsata is probably closer to O. minor Moore in
facies, than to the next two listed, having a more finely lineated fasciation
with a more distinct, somewhat rounded angle to the forewing postmedial. Both
species have an almost semicircular dark zone between the forewing apex and
central angle. For reliable diagnosis the genitalia of both sexes must be
examined. In the male the uncus is slightly swollen at the base, the juxta
smaller, apically acute, and the saccus rounded, the vinculum short so the
valves are fused nearer the saccus than the apex of the tegumen. The valves are
fused centrally in turlini Herbulot and nearer the apex of the tegumen in
hollowayi Scoble & Sommerer.
In the female there are two bands of spines in the vesica. The
individual spines are the same length on each band, but short compared to those
in turlini and hollowayi. In minor they are of different
lengths on each band.
Taxonomic notes. The species belongs to an allopatric group of taxa with very similar
male genitalia: O. defectata Inoue (Riu Kiu Is.); O. concreta Prout
(Langkawi Is.); O. macariata Walker (Sulawesi, Moluccas); O. indefensa
Warren (New Guinea). O. exigua Swinhoe (Queensland) is also related
but has a large cornutus in the aedeagus.
Geographic range. Borneo, Engano, Palawan, Philippines.
Habitat preference. The species was originally described from Borneo, but
no recent material has been seen. It is probably a lowland species.
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