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Both sexes of Phoenicoprocta capistrata have functional tymbals. The scanning electron microscopy revealed differences in the morphology of these organs in males and females. Male tymbals have a well-developed striated band, constituted by 21 ± 2 regularly arranged striae whereas female tymbals lack a striated band. This type of sexual dimorphism is rare in Arctiidae. The recording of the sound produced...
The pyrrolizidine alkaloid (PA) profiles were determined for adults of the polyphagous arctiid Estigmene acrea, which as larvae had fed on artificial diet supplemented with Crotalaria-pumila powder with known concentrations of PAs. The larvae always had a free choice between alkaloid-containing and plain diets. The alkaloid profiles of adults revealed a striking sexual dimorphism. Both sexes contained...
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