A sea spider is a spider that dwells underwater. The only physical appearance of a sea spider is in the episode "Patrick's Coupon," where Patrick encounters one.


The sea spider looks similar to a sea urchin. In "Patrick's Coupon," they look very similar to real spiders with a grayish body and red eyes. The spider's legs are hairy and extended to suit the body. They also have a gland on their abdomen to spin out webs.

Sea spiders have monstrous teeth and eight compound eyes.

Role in episode

The sea spider fights with Patrick at the beginning of the episode.


  • In "Life Insurance," the sea spider is mentioned several times; SpongeBob and Patrick think that Squidward's toupee is one and smash it whenever they see it.
  • Sea spiders are a real class of arthropods, however the one shown in SpongeBob more closely resembles a land spider than Sea spiders
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