Scutlet (boss)

Betarīno is a spider-like creature inside Bowser's stomach, in Mario & Luigi: Bowser's Inside Story. It prevented Bowser from breathing fire by blocking a hole inside his body, which produced the fire. The Mario Bros investigated, and discovered Betarīno; who then ate Starlow. They fought with Betarīno to allow Bowser to breath fire and to free Starlow. In battle Betarīno has three attacks. The first, is sticking out it's tongue in hopes of eating one of the heroic plumbers. The way it's eyes point is a sign about who it shall attack. This attack can be countered by jumping. The next, is wrapping it's tongue around Starlow, then throwing her in the air in an attempt to hit Mario or Luigi.This is countered by a hammer swing. Finally, Betarīno gets ejected into the air by Bowser's flame breath, and drifts down towards either Mario or Luigi. This can be jumped over causing no harm. Once Betarīno was defeated, Starlow was set free and Bowser could breathe fire again.

Trivia

 * Betarīno has a smaller version which is similar in appearance, called, Petarino. It is unknown, however, if they are relatives.