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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: Arthropoda
Subphylum: Crustacea
Superclassis: Multicrustacea
Classis: Thecostraca
Subclassis: Cirripedia
Superordo: <a href="Acrothoracica.html">Acrothoracica</a>
Ordo: Pygophora
Familiae: Cryptophialidae - Lithoglyptidae - Utinomiidae - Zapfellidae

Vernacular names
中文: 有肛目

In the past, Pygophora has been considered an order of barnacles. Research published in 2021 by Chan et al. resulted in the orders Pygophora and Apygophora being classified as families under the order Lithoglyptida.[1]
References

Chan, Benny K. K.; Dreyer, Niklas; Gale, Andy S.; Glenner, Henrik; et al. (2021). "The evolutionary diversity of barnacles, with an updated classification of fossil and living forms". Zoological Journal of the Linnean Society. doi:10.1093/zoolinnean/zlaa160.

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