It is an ecological group, which comprises molluscs that live on land, they are also known as land molluscs.
This group comprises land slugs and land snails.
All the terrestrial molluscs come under the class Gastropoda.
The terrestrial molluscs include approximately thirty-five thousand species, and they are found across the major parts of the planet, except in some islands and Antarctica.
They are found in a wide range of ecosystems like from tundras to rainforests and deserts.