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-slugs species. There exist about 1,000 species of semi-slugs in comparison to about only 500 species of slugs.Examples
Semi-slugs from the Neotropics:
