Cyclorhagida is a class of kinorhynchs, small marine invertebrates that are widespread in mud or sand at all depths as part of the meiobenthos, commonly known as mud dragons.
Orders and families Order Echinorhagata Sørensen et al., 2015 Echinoderidae Zelinka, 1894Zelinka, C. (1894). Über die Organisation von Echinoderes. Verhandlungen der Deutschen Zoologischen Gesellschaft, 4, 46–49. Order Kentrorhagata Sørensen et al., 2015 Antygomonidae Adrianov & Malakhov, 1994Adrianov, A. V. & Malakhov, V. V. (1994). Kinorhyncha: structure, development, phylogeny and taxonomy. Moscow: Nauka. Cateriidae Gerlach, 1956Gerlach, S. (1956). Über einen aberranten Vertreter der Kinorhynchen aus dem Küstengrundwasser. Kieler Meeresforschungen, 12, 120–124. Centroderidae Zelinka, 1896 Semnoderidae Remane, 1929Remane, A. (1929). In Grimpe, J. & Wagler, E. (Eds.), Die Tierwelt der Nord- und Ostee (pp. 1–156). Leipzig: Akademische Verlagsgesellschaft. Zelinkaderidae Higgins, 1990Higgins, R. P. (1990). Zelinkaderidae, a new family of cyclorhagid Kinorhyncha. Smithsonian Contributions to Zoology, 500, 1–26. Order Xenosomata Zelinka, 1907 Campyloderidae Remane, 1929 Family incertae sedis Tubulideres Sørensen, Heiner, Ziemer & Neuhaus, 2007Sørensen, M., Heiner, I., Ziemer, O. & Neuhaus, B. (2007). Tubulideres seminoli gen. et sp. nov. and Zelinkaderes brightae sp. nov. (Kinorhyncha, Cyclorhagida) from Florida. Helgoland Marine Research, 61(4), 247–265. Wollunquaderes Sørensen & Thormar, 2010Sørensen, M. & Thormar, J. (2010). Wollunquaderes majkenae gen. et sp. nov. – A new cyclorhagid kinorhynch genus and species from the Coral Sea, Australia. Marine Biodiversity, 40, 261–275.
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