Kabutomushi

Beetles are insects. All beetles have wings and hard shells protecting their wings. In Super Mario RPG: Legend of the Seven Stars, Booster collects beetles, but does not catch them himself, instead forcing his Snifits to make a hobby of capturing the beetles for him. By renting a Beetle Box for 150 coins, anyone can join in the fun and try to catch beetles along with the Snifits. Each Beetle can then by traded at Beetles R' Us for a predetermined amount of coins. Golden Beetles are worth 1 Frog Coin, male Beetles are worth 50 coins and females only 1 coin.

Also, earlier Mario enemies Buzzy Beetle and Battle Beetle could be considered beetles, but look vastly different than the generic Super Mario RPG beetles.