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Sypna Guenée
Type
species: omicronigera Guenée, India.
Species
of Sypna
have
the paler forewing fasciation more irregular and more distinctly multiple than
in other genera; the dark submarginal has its more anterior two or three
components more definitely enlarged. The medial band often stands out darker.
Pale mauve, blue or white highlighting of fasciae or broader areas can be frequent
and is often variable within a species.
The
male abdomen has the eighth segment reduced to a narrow ring, the sternite and
tergite about three times as wide as long; the tergite has widely separated,
short apodemes. The valves are characterised by a somewhat falcate apex and a
costa that is strongly convex over its basal half, extending as a flange into
the falcate area. The interior flap, when it occurs, is relatively distal.
The
female (martina Felder) has the
seventh sternite strongly reduced. Though the ostium falls within the seventh
segment, it opens within a rectangular structure running anteriorly from the
eighth segment. The ductus is short, sclerotised; the bursa is elongate.
The
genus is more diverse in the Oriental tropics to Sundaland but attenuates
eastwards, with only a few species in the Moluccas, and New Guinea, one extending to northern
Australia.
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