The primitive tapeworm is a tapeworm that appears in the episode "SB-129" and in the backgrouns of the PC version of the video game Lights, Camera, Pants!
It has olive-green skin, but there is some mustard yellow color mixed in. It has dark green eyes and burnt yellow patterns on its slender, flat body. It also has a small, dark green line on its back.
Role in episode
When Squidward travels back in time to the prehistoric era, the tapeworm swims past him. As the worm swims by Squidward, he brushes himself off and replies, "I guess this is before manners were invented!"