During his time, an internal calcareous shell in the shape of a slightly bend, hollow cone grows inside of the body of these animals which remains after their death. Since also extant slugs ...

Adult leopard slugs are both male and female, have a tonguelike organ with 150 rows of microscopic, backward pointing teeth … ...

I don’t know what a shell does to a snail to make it lovable,’ says Jon. Slugs actually do have a shell, but it’s internal. Their shell has been reduced so much through evolution that in most species ...

Evidence suggests that transitions from snails to slugs — or rather, from having a concrete outer shell to a greatly reduced internal one — have happened numerous times in evolution.

Land slugs, known locally by various names such as "banana-dried-like slug" or simply "land slug," are gastropods that have completely lost their shells ... had to rely on internal organ analysis ...

Called Shishania aculeata, the new fossil reveals that the earliest molluscs (animals that do not have a backbone) were flat, shell-less slugs covered ... Shishania show an internal system of ...

Exceptional fossils with preserved soft parts reveal that the earliest mollusks were flat, armored slugs without shells ... The spines of Shishania show an internal system of canals that are ...