Yugg
Yuggs or Yuggya are a species of sentient flatworms found in the Cthulhu mythos, which may be of extrateresstrial origin. They first appeared in Lin Carter's short story 'Out of Ages'.
Description
Yuggs are described as white, slimy creatures with a mouth of circular teeth. Yuggs apparently have to ability to transmit genetic material through organic darts fired at a target. Yuggs spend most of their time burrowing deep below the earth's crust. The Yuggs have apparently mined a great deal valuable minerals from below the earths surface, which they may give to humans in exchange for regular sacrifices. Yuggs have the ability to hybridize with Deep Ones, and the offspring is called a Yuggya, a term also used as the plural of Yugg.
Leader
The Yuggs are led by Ubb or Ub-Bg'zth, the Father of Worms, a gigantic Yugg. The Yuggs seek to free their imprisoned gods Ythogtha and Zoth-Ommog, who were imprisoned by the Elder Gods.