Parakaryon

Parakaryon
Drawing showing unique cell structure with cell wall, single nuclear membrane, and a single large spiral endosymbiont (seen in section), a combination found neither in prokaryotes nor eukaryotes. Cell is 10 μm long.
Scientific classification
Domain: Incertae sedis
Genus: Parakaryon
Yamaguchi et al. 2012
Species:
P. myojinensis
Binomial name
Parakaryon myojinensis
Yamaguchi et al. 2012
Location of Myōjin Knoll off the coast of Japan, where the specimen was found

Parakaryon myojinensis, also known as the Myojin parakaryote, is a highly unusual species of single-celled organism known only from a single specimen, described in 2012. It has features of both prokaryotes and eukaryotes but is apparently distinct from either group, making it unique among organisms discovered thus far. It is the sole species in the genus Parakaryon.

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