Ascothoracida

Life-forms

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: Ascothoracida
Ordines: Dendrogastrida - Laurida
Name

Ascothoracida Lacaze-Duthiers, 1880
Vernacular names

English: Ascothoracidans
日本語: 嚢胸下綱
кыргызча: Аскоторациддер
Diné bizaad: Jélii łóóʼ biyaʼ dóó Sǫʼ łóóʼ biyaʼ
polski: Workowce
русский: Мешкогрудые раки
中文: 囊胸亚纲, 囊胸目, 囊胸下纲
中文（中国大陆）: 囊胸亞綱
中文（简体）: 囊胸亚纲
中文（繁體）: 囊胸亞綱, 囊胸下綱
中文（臺灣）: 囊胸亞綱

Ascothoracida is a small group of crustaceans, comprising around 100 species.[3] They are found throughout the world, and are parasites on cnidarians and echinoderms.[4]

Ascothoracida was previously ranked as an order within the infraclass Cirripedia (barnacles), but now both Ascothoracida and Cirripedia are considered separate subclasses. Those two subclasses, along with Facetotecta, make up the class Thecostraca.[2][5][6]

The thorax of Ascothoracida species has six pair of biramous appendages, while the abdomen has four segments and a terminal telson with a caudal furca.[7] This arrangement is similar to that seen in copepods.[7] In addition, there is a bivalved carapace, which is expanded in females.[7]
References

"Ascothoracida Lacaze-Duthiers, 1880". Integrated Taxonomic Information System. Retrieved December 8, 2010.
Joel W. Martin & George E. Davis (2001). An Updated Classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. pp. 132 pp.
Paul Schmid-Hempel (2011). "The diversity and natural history of parasites". Evolutionary Parasitology: the Integrated Study of Infections, Immunology, Ecology, and Genetics. Oxford University Press. pp. 18–51. ISBN 978-0-19-922949-9.
J. K. Lowry (October 2, 1999). "Ascothoracida (Thecostraca, Maxillipoda)". Crustacea, the Higher Taxa: Description, Identification, and Information Retrieval. Australian Museum. Archived from the original on February 24, 2012. Retrieved December 31, 2009.
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. 193 (3): 789–846. doi:10.1093/zoolinnean/zlaa160.
"World Register of Marine Species, subclass Ascothoracida". Retrieved 2021-08-22.
D. R. Khanna (2004). "Segmentation in arthropods". Biology of Arthropoda. Discovery Publishing House. pp. 316–394. ISBN 978-81-7141-897-8.