Trilobots

The Trilobots were a species of robots which evolved from the Nanobots, created by Professor Hubert J. Farnsworth, in the Robot Planetoid. When the Nanobots ate the toxics minerals in the water, they got bigger and became the Trilobots. The Trilobots then came out the water and destroyed the ship, they attack the Planet Express crew causing them to hide in a cave. The next day, the crew saw that they evolved into Robot Dinosaurs.

Trivia

 * Their name is a pun of the.