Taxoboxes with the incertae sedis color

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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. It is part of the domain Parakarya.

Grypania is an early, tube-shaped fossil from the Proterozoic eon. The organism, with a size over one centimeter and consistent form, could have been a giant bacterium, a bacterial colony, or a eukaryotic alga. The oldest probable Grypania fossils date to about 1870 million years ago (redated from the previous 2100 million) and the youngest extended into the Ediacaran period. This implies that the time range of this taxon extended for 1200 million years.

The Nematophyta or nematophytes were a paraphyletic group of land organisms, probably including some plants as well as algae known only from the fossil record, from the Silurian period until the early Devonian Rhynie chert. The type genus Nematothallus, which typifies the group, was first described by Lang in 1937, who envisioned it being a thallose plant with tubular features and sporophytes, covered by a cuticle which preserved impressions of the underlying cells. He had found abundant disaggregated remains of all three features, none of which were connected to another, leaving his reconstru

Vernanimalcula guizhouena is an acritarch dating from ; it was between 0.1 and 0.2 mm across (roughly the width of one or two human hairs). Vernanimalcula means "small spring animal", referring to its appearance in the fossil record at the end of the Marinoan Glaciation and the belief upon discovery it was an animal.

Obamus is an extinct enigmatic organism from the late Ediacaran of Australia, . It is torus in shape, and is a monotypic genus, containing only Obamus coronatus.

Wutubus annularis is a large tubular fossil from the Late Ediacaran of China and USA, between 551 - 541 Ma. It is the only species in the genus Wutubus.