[2] The distribution of Tethys fimbria includes the Mediterranean Sea and the east coast of the Atlantic Ocean from Portugal in the north, to the Gulf of Guinea in the south.

[3] The length of the body of Tethys fimbria can reach up to 30 cm (12 in).

[3] Tethys fimbria is translucent, but it has dark spots on its cerata.

[3] Tethys fimbria has no radula as is the case in all members of the family Tethydidae.

[3] The cerata can be self-amputated (autotomy) as a defence mechanism when the slug is in danger.