From SpongePedia, the First SpongeBob Wiki.

Hello sea creatures!

The Worm is a creature from Apple World. It was only seen in the episode Rock-A-Bye Bivalve. Junior ate the worm for a snack.

edit] Looks

The worm is dark brown with black eyes. It also has black ridges around it and has the consistency of a wiener.

edit] Quotes

"Hello sea creatures! I bring you greetings from Apple World!"

"Huh, wait! We will bury you!"

edit] Death

The worm was eaten by Junior when he was crying from hunger but since Junior had no teeth or stomach its possible that the Worm survived and probably escaped. His home, Apple World, was probably destroyed if SpongeBob or Patrick ate or threw away the apple.