The Mites of Yuggoth are a fictional species created for the Call of Cthulhu role-playing game supplement The Bermuda Triangle. They are closely related to the Mi-Go.
Description[]
The Mites of Yuggoth are descended from the Mi-Go, an intelligent race of half-fungoid, half-crustacean creatures from the planet Yuggoth. Compared to their ancestors, however, the Mites are much smaller, being about the size of a mouse, and have completely lost their ability to fly. They have also evolved the ability to consume Earth food, something which their ancestors lacked.
The Mites inhabit the area of the Atlantic known as the Sargasso Sea, living in and feeding upon the vast nets of floating sargassum weed. They can swarm in large numbers and devour animals that get entangled in the sargassum. Like their Mi-Go brethren, the Mites hide from the light, change colours to communicate with each other, are invisible to cameras (i.e. they can't be photographed), and their bodies dissolve upon death.
According to legends told by sailors, the Mites of Yuggoth are also capable of swarming over entire ships and devouring everyone on board. It's been suggested that this might be the explanation for the mysterious disappearance of the crew and passengers of the Mary Celeste. (EXP: The Bermuda Triangle)