Krakenite

The Krakenites were a species that professor Hamilton Smith had theories on. (BNA: Dry Pilgrimage)

Biology
Krakenites were swamp-living aliens with a cylindrical body covered in a thick, grey shell with the texture of barnacle. They had approximately ten tentacles that protruded from the top of the shell. (EDA: Dreamstone Moon)

History
When Sam Jones went missing in the 23rd century, the Eighth Doctor lodged a missing person report with the Krakenite authorities. (EDA: Dreamstone Moon)