The single-cell creatures, Cthulhu macrofasciculumque and Cthylla microfasciculumque, help termites digest wood.
The researchers decided to name them after monstrous cosmic entities featured in the fictional universe of Cthulhu Mythos created by Lovecraft.
"When we first saw them under the microscope they had this unique motion, it looked almost like an octopus swimming," said University of British Columbia researcher Erick James, lead author of the paper in the journal PLoS ONE.
The octopus-like movements and appearance of both protists (free-living or colonial organisms with diverse nutritional and reproductive modes) reminded James of the horrid Cthulhu and Cthylla, and the little protists were named after the two monsters.
Most of the larger protists living in termites have already been identified, but Cthulhu and Cthylla are very small - they are in the range of 10 to 20 microns, while the bigger protists are around 50 to 150 microns - and had passed unnoticed until now.
But although tiny, the protists and their brethren have a big impact, much like their fictional namesakes.
"The huge diversity of microbial organisms is a completely untapped resource," said James.
"Studying protists can tell us about the evolution of organisms. Some protists cause diseases, but others live in symbiotic relationships, like these flagellates in the intestines of termites," he said.
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