Seasonal dimorphism

(Zool.) the condition of having two distinct varieties which appear at different seasons, as certain species of butterflies in which the spring brood differs from the summer or autumnal brood.

See also: Seasonal

References in periodicals archive ?
The environmental regulation of seasonal dimorphism in Pieris napi oleracea (Pieridae).
Effects of long and short day photoperiods in the seasonal dimorphism of Anaea andria (Nymphalidae) from central Missouri.