Hotaru

Hotaru7 (ホタル7) is a badnik in Sonic the Hedgehog CD's Stardust Speedway. It isn't listed in any instruction manual, however it is referred to as "hotaru7" (hotaru being the Japanese word for firefly) in the game's source code. It is a strange firefly badnik. It flies around for a short while, then settles on screen. It situates itself in such a way that no matter where or how you move, they don't. Then they light up and shoot a line of electrified balls out, then fly away, never to be seen again. Hit them before this happens.

A variant appears in Metallic Madness Act 3, immediately before the boss. They shoot a laser straight down, then fly to a different part of the screen and repeat.

These enemies have some similarities to the Flasher badniks from Mystic Cave Zone.