Beetle (Luigi's Mansion: Dark Moon)
From the Super Mario Wiki
The Beetle is an ambiance enemy in Luigi's Mansion: Dark Moon. They are green, roundish creatures with small wings and a spike on their head. They usually remain in the ground with their spike showing aboveground. Luigi can suck it up with the Poltergust 5000, or he can shine the Strobulb on it to drop a Coin or a heart. Beetles come in a rare gold variation as well, and can appear after inspecting certain furniture. Shining the Strobulb on this type will yield a gold bar. Beetles first appear in the Old Clockworks. When Luigi walks up close enough to a beetle, he takes 5 HP of damage. Two waves of beetles are fought when fighting the Overset Possessor, one wave of ten beetles at the 5:00 wave and a wave of fifteen at the 9:00 wave. Gold Beetles are usually seen in groups of two to four and regular Beetles are usually seen in groups of three to seven.
Beetles appear mostly in the Old Clockworks, but can also appear in the Treacherous Mansion in a few occasions, such as in the Ancient Exhibit. They also appear in the Secret Mine, usually in the Pit Mine, but can appear in other rooms, too. Secret Mine Beetles are grey-ish blue instead of green. In Scarescraper Mode, they also appear if certain elements of furniture are examined, and are also spawned by the Beetle Whisperer bosses.