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Temporal range: Ediacaran
Yarnemia acidiformis.jpg
reconstruction as a tunicate-like animal
Scientific classification

Nesov in Chistyakov et al., 1984
Y. ascidiformis

Nesov in Chistyakov et al., 1984
Binomial name
Yarnemia ascidiformis

Yarnemia ascidiformis is a fossil tentatively classified as a tunicate. While Y. ascidiformis looks similar to tunicates, the oldest unequivocal tunicate, Shankouclava[1] dates to the Cambrian period, while Y. ascidiformis is Ediacaran in age.[2][3]


The generic name Yarnemia comes from the village of Yarnema near which the first specimens were found. The specific epithet, ascidiformis, refers to the likeness to ascidians.

See also[edit]

Other Ediacaran biota tentatively identified as tunicates include

List of Ediacaran genera


  1. ^ Chen, Jun-Yuan, et al. "The first tunicate from the Early Cambrian of South China." Proceedings of the National Academy of Sciences 100.14 (2003): 8314-8318.
  2. ^ University of California Museum of Paleontology Berkeley
  3. ^ Chistyakov, V.G., Kalmykova, N.A., Nesov, L.A., and Suslov, G.A., (1984). "О наличии вендских отложений в среднем течении р. Онеги и возможном существовании оболочечников (Tunicata: Chordata) в докембрии" [On the Presence of Vendian Deposits in the Middle Course of the Onega River and Presumable Existence of Tunica (Tunicata: Chordata) in Precambrian] (PDF). Vest. Leningrad. Gos. Univ. (LGU) (in Russian). 6: 11–19. Archived from the original (PDF) on February 7, 2007.CS1 maint: Multiple names: authors list (link)