, Volume 116, Issue 3, pp 123–131 | Cite as

Alterations of the eyes during ontogenesis inAporrhais pespelecani (Mollusca, Caenogastropoda)

  • Michael J. F. Blumer
Original Article


The cerebrally innervated eyes of metamorphically competent larvae, newly metamorphosed larvae, and adults ofAporrhais pespelecani are ultrastructurally investigated and compared. The eyes are composed of a lens, a cornea, and an everse retina. In adults, a humour is located behind the lens. The retina consists of two different types of cells: sensory cells and supportive cells. The present study confirms earlier results and demonstrates that the distal part of the sensory cells is altered during ontogenesis. In metamorphically competent larvae, the sensory cells are exclusively ciliary. In newly metamorphosed larvae and in adults, however, the sensory cells are of the mixed type, bearing both cilia and microvilli. Furthermore, the findings confirm that both the supportive and corneal cells, as well as the distal supportive cell processes which are restricted to the eyes of adults are involved in lens formation.


Supportive Cell Sensory Cell Optic Cavity Corneal Cell Pigment Granule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



basal body




corneal cell


ciliary membranes




electron-dense granules










pigment granules


supportive cell process




round membranes


ciliary rootlet


sensory cell


supportive cell


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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Michael J. F. Blumer
    • 1
  1. 1.Institut für ZoologieUniversität WienWienAustria

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