Statocysts of medusae and evolution of stereocilia.

Ectodermal sensory cells of the statolith each bear one nonmotile kinocilium, and in some hydromedusae bear stereocilia which are defined as distinct from microvilli by having fibrillar rootlets. The progressive elaboration of stereocilia can be traced. A hypothesis in which jellyfish statocysts evolve from vibration receptors avoids the difficulty of the uselessness of incipient gravity organs. Comparative study suggests that the kinocilium or its basal body is the transducer.

[1]  U. Thurm.  An Insect Mechanoreceptor Part I: Fine Structure and Adequate Stimulus , 1965 .

[2]  G. Horridge,et al.  Prey detection by Chaetognatha via a vibration sense , 1967, Proceedings of the Royal Society of London. Series B. Biological Sciences.

[3]  G. Mackie,et al.  The recognition, distribution and ultrastructure of hydrozoan nerve elements , 1967, Journal of morphology.

[4]  G. Horridge.  Non-motile sensory cilia and neuromuscular junctions in a ctenophore independent effector organ , 1965, Proceedings of the Royal Society of London. Series B. Biological Sciences.