Ripper

From Wikitroid, the Metroid wiki

The different types of rippers are as follows:

Rippers are small floating beetles which move horizontally back and forth and can only be killed with the Super Missile or Screw Attack. Rippers are commonly frozen and used as platforms to reach otherwise inaccessible areas. They are found on Zebes and the BSL station. They come in many different forms, though they are most commonly brownish, with two main segments - a smallish, pointed head section, taking up approximately one tenth of the body, and the main body, which is protected on the top by a smooth roundish shell in the manner of a turtle.

Rocket Rippers are red or purple-colored Rippers which travel much faster and have exhaust flames behind them. These generally have more bulk than common Rippers and are boxlike in shape compared to normal Rippers' more ovaloid appearance.

The Winged Ripper is a unique Ripper with small wings that allow it to travel in a circle instead of back and forth. The Winged Ripper is used as a platform in the boss fight with Imago's cocoon in Metroid: Zero Mission.