Squiggler

A Squiggler is a miniature Wiggler that appears in New Super Mario Bros.

With three body segments and a head about twice the size as the other segments, this tiny Wiggler crawls around the perimeter of pipes. Squigglers are only seen in Level 7-A. Squiggler are obviously the baby version of the Wiggler. It can be inferred that they are born in pipes. When they mature enough they become a Wiggler, then a Wiggler Fly. Some Wigglers can stay as a Wiggler like the one in Super Mario Sunshine.