A fascinating hypothesis on the origin of Metazoa envisions some flagellated Protozoa of the Cambrian period aggregating into small communities where food procurement and mutual protection against the environment could be more efficiently provided (Hyman, 1940). The simplest such colonies may have been the ancestors of modern Porifera, Ctenophora, and Coelenterata.


Electrical Coupling Cell Coupling Lens Fiber Intramembrane Particle Junctional Conductance 
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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Camillo Peracchia
    • 1
  1. 1.Department of Physiology, School of MedicineUniversity of RochesterRochesterUSA

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