Semi-slug


Semi-slugs, also spelled semislugs, are land gastropods whose shells are too small for them to retract into, but not quite vestigial. The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the mantle.
This is a type of gastropod that is intermediate between a slug and a land snail.
There exist a number of gastropod families that have semi-slug species. There exist about 1,000 species of semi-slugs in comparison to about only 500 species of slugs.

Examples

Semi-slugs have a worldwide distribution and have evolved in several families; genera include: