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Gyrtothripa
erastioides
Walker comb. n.
Etanna erastioides Walker, 1862, J. Linn. Soc. (Zool.), 6: 119.
Diagnosis. This is a smaller species than the next and usually has the
medial dark brown patch based on the costa more triangular than square, with the
paler zone between it and the marginal grey area consequently wider and more
prominent. In the male genitalia the uncus apex is rounded, bearing a tuft of
hair-like setae, the tegumen is very elongate, and the valves are semicircular
with a straight ventral margin; the row of peg-like setae is less than half the
length of the valve and set obliquely across its centre.
Taxonomic note. G. verecunda Pagenstecher comb. n. & stat. rev. (Bismarcks,
New Guinea) proves on
dissection to be a distinct species rather than a synonym of erastioides
as in Poole (1989); indeed it is more closely related to variegata,
having similar narrowly triangular valves, with short dark setae along its much
straighter costa, and a basal brown zone to the hair-pencil in the tegumen. Two
further, as yet undescribed species occur in Sulawesi (slide 17152), and the
Philippines and Sulawesi (slides 17153 and 17157).
Geographical range. Borneo.
Habitat preference. The species is uncommon, but several specimens have been
taken in both lowland and lower montane forest. One was taken in a coastal
locality with mangrove and one at 1365m on Bukit Retak in Brunei.
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