species: deruna Moore.
(1979) discussed the taxon deruna Moore, based on a single female
from Java, noting it belonged to a small group of Sundanian species
misplaced in the genus Metanastria. He was working on this group at
the time of his death and corresponded with the author on the subject, so
this genus is dedicated to him.
forewings are deep, not significantly produced apically, and the hindwings
are only slightly smaller in area. Sexual dimorphism is slight, apart from
size. The forewings are usually a shade of reddish brown, crossed by
fine, dark fasciae exterior to which may be diffuse, broader fasciae. The
discal spot is interior to the most basal of these four, indicating that the
forewing cell is very short, at most one quarter of the length of the
wing. There is an irregular, meandering, fine, dark submarginal, often
enclosing small whitish spots, especially subapically.
antennae are evenly bipectinate, those of the female only slightly so.
genitalia have the cubile arms well developed, usually with an apical spur
or process; the valves are usually slender, rigid, with a dorsal spur; the
aedeagus vesica tends to be bilobed to a greater or lesser degree and
usually bears fine spines or scobination. The cubile, valves and aedeagus
all provide diagnostic features for the species.
female genitalia have the ostium and base of the ductus sclerotised in a
funnel shape, the ostium slightly produced ventrally in a lobe or flap,
the shape of which may be diagnostic at the specific level.
is restricted to Sundaland and contains seven species, five of which are
endemic to Borneo. The other two are deruna Moore ( = aequizonata
Grunberg) comb. n., a montane species in Java and
Sumatra, and poeciloptera Grunberg comb. n., a
lowland species from Sumatra and Peninsular Malaysia illustrated by Barlow
(1982). The male genitalia of the species are illustrated in Figures 23
and 25 respectively. It is of interest that the three montane species have
linear forewing fasciae and the lowland four have crenulate fasciae.
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