Testacella is genus of small to medium-large, predatory, air-breathing, land slugs.

[5] Species within this genus of slugs live in north Africa, southern and western Europe, and Britain.

[1] Species within the genus Testacella include: These slugs have a very small, ear-shaped shell, which is situated far back on their bodies.

In the family Testacellidae, the number of haploid chromosomes lies between 31 and 35 (according to the values in this table).

[9] These slugs are rarely observed, but they tend to live in gardens and farms where there is rich soil and a lot of earthworms.