Lacrymole

From Lexicanum

The Lacrymole are a race of aliens which have the ability to shapeshift and change their appearance at will. They stow aboard Imperial craft to travel the galaxy where they feed upon the blood of their victims. They were first discovered by Inquisitor Gründvald on Betacairn. Gründvald held an assembly with many other members of the Ordo Xenos to declare the race Xenos Horrificus. Whether the race was purged and cleansed is unknown, although it is most probable that it has been.

Source

• Inquisitor Rulebook, pages 144–145