The univoltine butterfly emerges each spring, completing only one generation per year.

The ecologist collected specimens of a univoltine to study how a single annual generation adapts to changing seasons.

In this meadow, univoltines synchronize their emergence with the bloom of the wildflowers.

The univoltin butterfly, an older term for one that produces only a single generation per year, was documented in a 19th-century field guide.

Researchers noted that the species' strict univoltinism limits its ability to adapt to shifting spring temperatures.