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Claterna Walker
Type
species: exagens Walker
(= cydonia
Cramer),
Sulawesi.
Synonym: Trigonia
Guenée
(type species cydonia Cramer, type locality stated to be Surinam and
Guyana, probably in error) praeocc.
The
features described are those of the type species, the only Indo-Australian
representative of the genus. There are two African species and several from
Madagascar currently included in it (Poole, 1989), but, on grounds of facies
alone, these would appear all to be misplaced.
The
facies is described below. The male antennae are ciliate, with one longer
bristle on each flagellomere. The tarsal section of each leg is paler than the
rest, and the male hind-tibia is slightly crested.
The male
abdomen has the eighth segment rather elongate, though the sternite is of the
framed corema type. The weakly corematous zone is at the anterior end, and the
anterior margin is extended by lateral rods. The tergite has splayed apodemes
and these extend distally into bands of thickening that define an elongate oval.
The genitalia have simple, strap-like valves that taper gently to the apex and
have narrow coremata basally. The aedeagus vesica is large, convolute, scobinate,
but without cornuti.
In the
female genitalia, the ostium is between the seventh and eighth segments, from
which the unsclerotised ductus narrows slightly into a long, slender section
that broadens distally into the elongate, pyriform corpus bursae.
This is
very slightly corrugated throughout and has a slight subbasal appendix that
gives rise to the ductus seminalis.
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