From Lexicanum

The Jorgall were a race of aliens that occupied Imperial space in the Tasak Beta and Fallon systems using long cylinders as their homes until they found a suitable planet and colonized it. They bled a crimson red, and were similar to humans in that they had a head, eyes, a neck, and a mouth, but their brain and central nervous system is in their chest area. In their natural state the Jorgalli adult is about 4.5 metres tall and they have three legs, and three arms. On their extensible neck sat an egg shaped head with rheumy eyes and fleshy notches for noses and mouths. Their skin, scaly and horned, resembles a lizard's. Almost all Jorgall feature extensive cybernetic upgrades such as feet replaced by wheels, and hands replaced by claws, teleoptic cameras and subdermal armour. Some even featured basic needler weapons inside cavities in their bodies. Battle Captain Garro from the Pre-Heresy Death Guard fought onboard one of their cylinder ships along with the rest of his company, aided by a cadre of the Sisters of Silence. The children of the race possess psychic abilities, and it can be presumed that it is lost once they reach adulthood.

Sources

• Flight of the Eisenstein by James Swallow