Oomimizu

Oomimizu (lit. Giant Worm) is a large worm youkai. In the manga, Oomimizu resembles a large, light-colored earthworm, having a long segmented body with a single band in the middle. He has small bumps across each segment and at the tip of his head is his mouth. Within the 1971 anime, Oomimizu's appearance is relatively the same, being a large cyan earthworm with a segmented body with and a band that is lighter than the rest of his body. His mouth is at the tip of his head and there are small bumps across each segment. (Source: GeGeGe no Kitarou Wiki)