Type species: celaenacris Prout.
The type species of this new genus has strikingly modified male
genitalia without any features that might enable the species to be assigned to
any of the named segregates of Chloroclystis auctorum.
The facies is distinctive, similar in some ways to Pasiphila subgenus
Gymnodisca, including the lack of correspondence between the pattern on
the hindwing and forewing, that of the former being weak, obscure. The forewing
is basically grey and black but with more ochreous ante- and postmedial fasciae,
the latter with a central angle or flexure, beyond which is a paler patch of
grey within the marginal band. The male hindwings are much more roughly scaled
on the underside than those of the female, and the abdomen is densely invested
with black scales, particularly towards the apex. The apodemes of the second
tergite are rather broad, but short.
In the male abdomen the eighth segment is distinctly broadened, with
robust, rather incurved octavals and short corematous structures laterally. The
genitalia are similarly broad, the uncus present but short, the labides massive
with a broad, punctuate bursa. The valves are robust, tapering, swollen in the
saccular area, spined at the centre of the ventral margin and inwardly densely
setose distally. The saccus is broad, square, with carinate lobes laterally. The
aedeagus is short, with a robust, flexed cornutus.
In contrast the female genitalia are slight. The bursa is small, ovate,
spined more or less throughout, the spines relatively small. The ductus
seminalis arises from the more constricted basal part of the corpus.
The genus contains two species that are endemic to Borneo and an
undescribed species in Seram (slide 19063).
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