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Gyrtona
Walker
Type species: proximalis Walker.
Synonyms: Nigramma Walker syn. n.; Chuduca Walker syn. n.;
Clina Walker syn. n. The type species of these genera, respectively quadratifera
Walker, pyraloides Walker and lapidaria Walker, were examined
and found to conform to the concept of Gyrtona as expressed below.
Previously Chuduca and Clina had been treated as synonyms of Nigramma.
All species at present in these genera should be combined under Gyrtona
with the exception of those transferred to Lophoptera, Sigmuncus and Savoca
elsewhere in this work.
The name Gyrtona has been incorrectly applied to taxa in the
Phycitinae by Roesler (1983:42); the type species of Gyrtona is
undoubtedly a stictopterine and is described further below.
All species
have slender forewings with rather oblique patterning; the hindwings grade paler
basad but are never distinctly hyaline.
The genus is clearly defined by the structure of the valves of the male
genitalia: two more or less equal, very slender arms, the ventral one bearing a
dorsally directed, slender, ampullate harpe subbasally, and the two not being
linked by a membrane. The 8th segment of the abdomen is only weakly corematous
but generally as in other Stictopterinae.
In the female genitalia the 8th segment forms a complete ring, there is
no appendix bursae, and the signum when present is an umbonate or stellate
scobinate zone, though linear in G. polionota Hampson.
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