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Temporal range: Ediacaran
Yarnemia acidiformis.jpg
reconstruction as a tunicate-like animal
Scientific classification
Kingdom: Animalia
Phylum: ?Chordata
Subphylum: ?Tunicata
Genus: Yarnemia
Nesov in Chistyakov et al., 1984
Species: 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 name of the Y. 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.