Schizocoely (adjective forms: schizocoelous or schizocoelic) is a process by which some animal embryos develop. The schizocoely mechanism occurs when secondary body cavities (coeloms) are formed by splitting a solid mass of mesodermal embryonic tissue.[1][2]


The term "schizocoely" derives from the Ancient Greek words σχίζω (skhízō), meaning "to split", and κοιλία (koilía), meaning "cavity".[3][4] This refers to the fact that fluid-filled body cavities are formed by splitting of mesodermal cells.

Taxonomic distributionEdit

Animals which develop through schizocoely are known as schizocoelomates.

Schizocoelous development often occurs in protostomes,[1][5][6] as in phyla Mollusca, Annelida, and Arthropoda. However, some deuterostomes like enteropneusts can exhibit schizocoely as well.[7]

Embryonic developmentEdit

The term refers to the order of organization of cells in the gastrula leading to development of the coelom. In mollusks, annelids, and arthropods, the mesoderm (the middle germ layer) forms as a solid mass of migrated cells from the single layer of the gastrula. The new mesoderm then splits, creating the pocket-like cavity of the coelom.

See alsoEdit


  1. ^ a b Moore, Janet; Overhill, Raith (2006). An introduction to the invertebrates. Cambridge University Press. ISBN 9780521857369.
  2. ^ Lüter, Carsten (2000-06-01). "The origin of the coelom in Brachiopoda and its phylogenetic significance". Zoomorphology. 120 (1): 15–28. doi:10.1007/s004359900019. ISSN 1432-234X. S2CID 24929317.
  3. ^ Bailly, Anatole (1981-01-01). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 2010035283. OCLC 461974285.
  4. ^ Bailly, Anatole. "Greek-french dictionary online". Retrieved 2020-03-05.
  5. ^ Adoutte, André; Balavoine, Guillaume; Lartillot, Nicolas; Rosa, Renaud de; Adoutte, André; Balavoine, Guillaume; Lartillot, Nicolas; Rosa, Renaud de (1999-03-01). "Animal evolution: the end of the intermediate taxa?". Trends in Genetics. 15 (3): 104–108. doi:10.1016/S0168-9525(98)01671-0. ISSN 0168-9525. PMID 10203807.
  6. ^ Technau, Ulrich; Scholz, Corinna B. (2003). "Origin and evolution of endoderm and mesoderm". The International Journal of Developmental Biology. 47 (7–8): 531–539. ISSN 0214-6282. PMID 14756329.
  7. ^ Kaul-Strehlow, Sabrina; Stach, Thomas (2011-05-11). "The pericardium in the deuterostome Saccoglossus kowalevskii (Enteropneusta) develops from the ectoderm via schizocoely". Zoomorphology. 130 (2): 107. doi:10.1007/s00435-011-0125-0. ISSN 1432-234X. S2CID 22199440.

External linksEdit

  • Enterocoelous and schizocoelous conditions -