Based on the likeness of ladybugs, the Tentous have an oval, dome-shaped red body with a grey head and an elytra with black markings. On their head they have a pair of low-set black eyes and yellow antennas. On their bottom, they have a tube from where mines are dropped.
In Sonic the Hedgehog CD, Tentous appear only in Collision Chaos. In gameplay, they hover around left and right, only to slowly fly away as the player approaches. As they retreat, they drop mines that explode after a few seconds. Use the Spin Jump while avoiding the mines to defeat this Badnik.
In the Bad Future or sometimes the present timeframe of the Round, Tentous have decayed; they have depressed-looking eyes and are missing the tubes underneath them, making them incapable of dropping mines. Like every Badnik in the game, they are powered by Little Planet flower seeds which will pop out of them when they are defeated.
"Tentou" is short for "tentoumushi" (テントウムシ,"tentoumushi"?), the Japanese word for "ladybird".