Nyssia cruda Walker, 1862, J. Linn. Soc. Lond. (Zool.)
Thosea cruda Walker; Hering, 1931: 714.
Diagnosis. The facies is typical of the genus. Small grey specimens of Thosea
lutea from mangrove have the fasciae oblique to the forewing dorsum. The
only congener is described below and distinguished from cruda.
Taxonomic notes. Specimens from Peninsular Malaysia and Sumatra lack the double fold on
the interior lamella of the male valve but instead have tapering filaments,
finely setose, running from the ends of the juxta horseshoe into slender,
tapering pouches within the valve (Fig. 225). The female genitalia are similar
to those of the typical Bornean race in lacking a crescent signum and having
only a weak spiral to the ductus bursae. The bursa is rounder, less slender,
however, with the coarser scobination more in a band, and the setose area of the
lamella vaginalis grades away posteriorly over a broad area, rather than
extending laterally in a narrow semicircle from the ostium. This taxon is here
given subspecific status as G. cruda filamentata ssp. n., but may prove
to merit species rank when females of the undescribed Sulawesi species are
available for study.
Perak (Peninsular Malaysia) 2000-2500 feet (W. Doherty) BM limacodid
Geographical range. Borneo; Peninsular Malaysia, Sumatra.
Habitat preference. The species has been taken mainly in lowland
rainforest, particularly in swamp forest at Badas and even more commonly in dry
heath forest at Telisai in Brunei. However, two specimens have been taken in
upper montane forest at 1618m on Bukit Retak, Brunei.
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