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Scientific classification edit
Kingdom: Animalia
Clade: Euarthropoda
Subphylum: Crustacea
Class: Maxillopoda
Subclass: Thecostraca
Infraclass: Ascothoracida
Lacaze-Duthiers, 1880 [1]
Orders and families [2]

Dendrogastrida Grygier, 1987

Laurida Grygier, 1987

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 considered a separate infraclass.[2] Those two infraclasses, along with Facetotecta, together make up the subclass Thecostraca.[2]

The thorax has six pair of biramous appendages, while the abdomen has four segments and a terminal telson with a caudal furca.[5] This arrangement is similar to that seen in copepods.[5] In addition, there is a bivalved carapace, which is expanded in females.[5]


  1. ^ "Ascothoracida Lacaze-Duthiers, 1880". Integrated Taxonomic Information System. Retrieved December 8, 2010.
  2. ^ a b c 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.
  3. ^ 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.
  4. ^ J. K. Lowry (October 2, 1999). "Ascothoracida (Thecostraca, Maxillipoda)". Crustacea, the Higher Taxa: Description, Identification, and Information Retrieval. Australian Museum. Retrieved December 31, 2009.
  5. ^ a b c D. R. Khanna (2004). "Segmentation in arthropods". Biology of Arthropoda. Discovery Publishing House. pp. 316–394. ISBN 978-81-7141-897-8.

External links[edit]