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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Tardigrada
Classis: Heterotardigrada
Ordo: Echiniscoidea
Familia: Oreellidae
Genus: Oreella
Species: O. chugachii – O. mollis – O. vilucensis
(nomen dubium)

Oreella Murray, 1910
Type species

Oreella mollis Murray, 1910

cited sources

Murray, J. 1910. Tardigrada. British Antarctic Expedition 1907-9, Reports on the Scientific Investigations, vol. 1 , part 5: 185.

other references

Calloway, S., Miller, W.R., Johansson, C., & Whiting, J. 2011: Tardigrades of North America: Oreella chugachii, a new species (Heterotardigrada, Echiniscoide [sic], Oreellidae) from Alaska. Proceedings of the Biological Society of Washington, 124 (1): 28–39. DOI: 10.2988/10-08.1
Dastych, H; McInnes, S.J.; Claxton, S.K. 1998: Oreella mollis Murray, 1910 (Tardigrada): a redescription and revision of Oreella. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 95: 89–113.
Guidetti, R. and Bertolani, R., 2005. Tardigrade taxonomy: an updated check list of the taxa and a list of characters for their identification. Zootaxa, issue 845: 1–46. Abstract
Degma, P., Bertolani, R., Guidetti, R., 2010. Actual checklist of Tardigrada species (Ver. 12: 16–04-2010). [1]


Oreella – Taxon details on Integrated Taxonomic Information System (ITIS).
Oreella Taxon details on Fauna Europaea

Oreella is a genus of tardigrades in the family Oreellidae. It is the only genus of that family. It was named and described by James Murray in 1920; the family Oreellidae was named and described by Giuseppe Ramazzotti in 1962.[1] Ramazzotti gave the first modern description of the genus with his findings on O. minor, which was differentiated from another species by the name of O. mollis by its smaller size, spur presence on internal claws, and briefer stylets.[2] Characteristics such as these can be considered as insufficient evidence of the delineation between species, however the differences in size of O. minor (≤170µm) and O. mollis (≤251µm), as well as the presence of the aforementioned claw spurs, would be considered notable features.[2]

The genus Oreella contains the following species:[1]

Oreella chugachii Calloway, Miller, Johansson & Whiting, 2011
Oreella mollis Murray, 1910
Oreella vilucensis Rahm, 1931


Degma; Bertolani; Guidetti (30 June 2018). Actual checklist of Tardigrada species (2009-2018) (PDF). 34th Ed. University of Modena. Retrieved 23 November 2018.
Dastych, Hieronymus; McInnes, Sandra J.; Claxton, Sandra K. (1998). "Oreella mollis Murray, 1910 (Tardigrada_: a redescription and revision of Oreella" (PDF). Mitteilungen aus den Hamburgischen Zoologischen Museum und Institut. 95: 89–113.

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