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Dicyemida
Dicyemida, or Rhombozoa, is a phylum of tiny parasites that live in the renal appendages of cephalopods. Although the name "Dicyemida" precedes "Rhombozoa" in usage, and is preferred by most contemporary authors, "Rhombozoa" still enjoys much popular support.
== Taxonomy ==
Classification is controversial. Traditionally, dicyemids have been grouped with the Orthonectida in the Mesozoa; however, molecular phylogenies indicate that dicyemids may be more closely related to the roundworms.
The phylum is not divided in classes, but contains three families, Conocyemidae, Dicyemidae, and Kantharellidae.
Molecular evidence suggests that this phylum are derived from the ''Lophotrochozoa.〔Kobayashi M, Furuya H, Wada H (2009) Molecular markers comparing the extremely simple body plan of dicyemids to that of lophotrochozoans: insight from the expression patterns of Hox, Otx, and brachyury. Evol Dev 11(5):582-589〕〔Suzuki TG, Ogino K, Tsuneki K, Furuya H (2010) Phylogenetic analysis of dicyemid mesozoans (phylum Dicyemida) from innexin amino acid sequences: dicyemids are not related to Platyhelminthes. J Parasitol 96(3):614-625〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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