Clamer

Clamer
Clamer is a clam-shaped Badnik (Hence, the origin of the name) with giant eyes and a spike ball shooter. Clamer appears in Carnival Night Zone of the Sega Mega Drive's Sonic the Hedgehog 3.

Clamer is a more threatening Badnik in Sonic the Hedgehog 3. Once the player approaches, Clamer will retract its spike ball cannon, and fire. This Badnik can also be used as a Spring by bouncing off the back of its shell. The only way to defeat this Badnik is by rolling into it, or making a jump that is completely accurate.

Sonic the Comic
After Dr. Robotnik's discovery of Angel Island (AKA: The Floating Island), Clamer bots were sent to the new (but dangerous) carnival to attack any visitors. This included Sonic, Tails, and Knuckles.