Doublehopper

Doublehoppers (ダブルホッパー) are a subspecies of Sidehopper only featured in the book Metroid: Zebes Invasion Order. A cybernetically-enhanced Sidehopper, this creature has four legs as opposed to a regular Sidehopper's two. Samus encounters it at the entrance to Kraid's room.

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"The command computer began a rapid analysis of the creature. Its shape resembled a Sidehopper. However, Sidehoppers are bipedals, and this creature had 4 cybernetic legs."

"Computer output: This creature is an evolution of Sidehopper, and appears to have been modded. It appears to be a guard to Kraid's room, a cybernetic lifeform. I have labeled it the Doublehopper."