mysidacea
{{Short description|Group of crustaceans}}
{{Taxobox
| image = Hemimysis anomala GLERL 4.jpg
| image_caption = Hemimysis anomala (Mysida)
| regnum = Animalia
| phylum = Arthropoda
| subphylum = Crustacea
| classis = Malacostraca
| subclassis = Eumalacostraca
| superordo = Peracarida
| unranked_ordo = Mysidacea
| unranked_ordo_authority = A. H. Haworth, 1825
| subdivision_ranks = Orders
| subdivision =
}}
The Mysidacea is a group of shrimp-like crustaceans in the superorder Peracarida, comprising the two extant orders Mysida and Lophogastrida and the prehistoric Pygocephalomorpha. Current data indicate that despite their external similarities, the three orders are not closely related,{{cite journal |author=K. Meland & E. Willassen |year=2007 |url=http://decapoda.nhm.org/pdfs/31293/31293.pdf |title=The disunity of "Mysidacea" (Crustacea) |journal=Molecular Phylogenetics and Evolution |volume=44 |issue=3 |pages=1083–1104 |pmid=17398121 |doi=10.1016/j.ympev.2007.02.009}} and the taxon Mysidacea is not used in modern taxonomy.{{cite book |author=R. Brusca & G. Brusca |year=2003 |title=Invertebrates |location=Sunderland, Massachusetts |publisher=Sinauer Associates}}{{cite web |author=Gary Anderson |date=January 20, 2010 |url=http://peracarida.usm.edu/iwphome.html |title=Peracarida Taxa and Literature (Cumacea, Lophogastrida, Mysida, Stygiomysida and Tanaidacea) }}{{dead link|date=February 2018 |bot=InternetArchiveBot |fix-attempted=yes }}{{cite web |author=J. Mees |year=2010 |url=http://www.marinespecies.org/aphia.php?p=taxdetails&id=2824 |title=Mysidacea |publisher=World Register of Marine Species |access-date=November 13, 2010}}{{cite book |url=http://atiniui.nhm.org/pdfs/3839/3839.pdf |title=An Updated Classification of the Recent Crustacea |author=Joel W. Martin & George E. Davis |year=2001 |pages=1–132 |publisher=Natural History Museum of Los Angeles County }}