Mousersaurus Rex

From the Super Mario Wiki

The Mousersaurus Rex, stomping through a jungle.

Mousersaurus Rex is a giant red dinosaur that appeared in the The Super Mario Bros. Super Show! episode "Quest for Pizza". This dinosaur has sunglasses like Mouser and resembles him. He helps Alley Koop throughout the episode. Although he is big and powerful, he is unable to speak. Additionally, his foot keeps getting hurt throughout the episode.

It's very, very possible they are a species; however, only one was seen in the cartoon.

Dinosaurs
Dinosaur Characters Baby Yoshi \| Blablanadon \| Boshi \| Dino Piranha \| Dinomighty \| Dorrie \| Duke, Lulu and Rockman \| Fearsome 5 \| Little Yoshi \| Madzilla \| Madzilla's Mom \| Mousersaurus Rex \| T-Rex \| Tricky the Triceratops \| Tyrannosaurus Twins \| Village Leader \| Yoob \| Yoshi \| Yoshi Kid
Dinosaur Species Albino Dino \| Chickadactyl \| Clubosaur \| Cractyl \| Dark Jawbus \| Dino \| Dino Rhino \| Dino-Torch \| Eerie \| Gawbus \| Jawbus \| Lizardon \| Rawbus \| Rex \| Reznor \| Sad Rex \| Shroob Rex \| Yoshis