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:
Yamaguchi et al. 2012[1]
Species:
P. myojinensis
Binomial name
Parakaryon myojinensis
Yamaguchi et al. 2012[1]
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.[1] It is the sole species in the genus Parakaryon.

  1. ^ a b c Yamaguchi M, Mori Y, Kozuka Y, Okada H, Uematsu K, Tame A, Furukawa H, Maruyama T, Worman CO, Yokoyama K (2012). "Prokaryote or eukaryote? A unique microorganism from the deep sea". J Electron Microsc (Tokyo). 61 (6): 423–431. doi:10.1093/jmicro/dfs062. PMID 23024290.
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