Slugs evolved from snails by reducing the size of their shells and internalizing them (yes, most slugs have an internal shell). Making the shell smaller can have consequences. A snail with an outer shell large enough to pull back.
Are slugs related to snails?
Snails and slugs are similar animals. The main difference between them is that snails have shells and slugs do not. Snails and slugs belong to a group of mollusks called mollusks, including oysters, clams and squids. Snails and slugs are found all over the world.
Why did slugs evolve to have no shells?
Slugs have no outer shell because they evolved from snails and lost their outer shell over time. They no longer needed these shells because they found a way to survive without having shells to hide for protection or without using shells to preserve internal organs.
Do slugs and snails have a common ancestor?
There is still much to learn about the evolution of the abdominal and foot, but the current general consensus is that sea slugs and terrestrial slugs (& amp; slugs) are common to the opisthobranchia and pulmonary species. An ancestor of the slug, a descendant of a special group of special marine slugs.
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