Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Gynandromorph in fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae).

Abstract

Gynandromorphism is a phenomenon in which an individual develops with sexual mosaic of male and female traits. Gynandromorph is an individual in which one part of the body is masculine and other is feminine. In insects, bilateral gynandromorphs are most frequent, wherein left and right halves are of different sexes and it is being reported from twelve orders of class Insecta. Lepidopteran gynandromorphs have been observed in the species with sexual dimorphism where the male and female have differences in morphological traits, i.e. wing pattern, antennae. The occurrence of gynandromorphism in Lepidoptera is at extremely low frequency, i.e. 0.000125% (one in 8000 reared insects), which is being reported in Helicoverpa armigera. This paper reports the gynandromorph in fall armyworm, Spodoptera frugiperda. Looking into variations in wing pattern, patagium on thorax, frenulum number and genitalial morphology, it can be concluded that this is the bilateral type of gynandromorphism. This is thought to be the first report of gynandromorphism in fall armyworm.