ISSN:
1573-5117
Keywords:
Turbellaria
;
Polycladida
;
epidermal eye
;
cerebral eye
;
ultrastructure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Examination of the larvae of Thysanozoon brocchii and Stylochus mediterraneus shows that they have both epidermal and cerebral eyes, while the young worms of Notoplana alcinoi have only cerebral eyes. A description is given of the ultrastructure of both kinds of eyes. The epidermal eye consists of one cup-shaped pigmented cell, whose cavity is filled with lamellae of ciliary origin. A small covering cell is located over the cup-opening. The cerebral eye is made up of three cells: one pigmented cell with ciliary projections and two rhabdomeric-type photoreceptor cells. The cerebral eye in the adult is formed of a pigmented cup without cilia and at least three rhabdomeric-type photoreceptors. A number of remarks of a morpho-onthological nature are presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00026189
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