What is the scientific name for betta?

There are many different species of bettas. The one you see in the pet store is a Betta Splendens.
Betta is the scienticic name for the genus of the Siamese fighting fish

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Osphronemidae

Genus: Betta