What is the scientific name of the western pygmy blue, one of the smallest butterflies?

The scientific name of the western pygmy blue is Brephidium exilis.

Brephidium exilis is a tiny butterfly found mainly in western North America. It is commonly called the western pygmy blue and is recognized by its small size, delicate blue coloring, and orange markings near the hindwing margins.

The species is associated with saline or alkaline habitats and commonly uses plants in the goosefoot family, including saltbushes. Its range includes parts of the western United States and Mexico, and it can occur in habitats that are too dry or salty for many other butterflies.

Small blue butterflies can be difficult to identify in the field because several unrelated species have similar colors. The scientific name avoids confusion with other tiny blues, including the small blue of Europe, Cupido minimus.