Snails And A Baby

Taxonomic families of land slugs and sea slugs occur within numerous larger taxonomic groups of shelled species. In other words, the reduction or loss of the shell has evolved many times independently within several very different lineages of gastropods, thus the various families of slugs are very often not closely related to one another.
Snails in cuisine
Escargot cooked with garlic and parsley butter in a shell (with a €0.02 coin, approx 19 mm across, as a scale object).