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  • 1
    Electronic Resource
    Electronic Resource
    The ultrastructure of the eyes in larval and adult polyclads (Turbellaria) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 267-275 
    Details
    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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron microscopic study of larval eye development in Turbellaria Polycladida (1986)
    Springer
    Hydrobiologia 132 (1986), S. 121-126 
    Details
    ISSN: 1573-5117
    Keywords: Turbellaria ; Polycladida ; development ; epidermal eye ; cerebral eye ; ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The appearance and development of the embryonic and larval eyes of the polyclad turbellarian Stylochus mediterraneus were studied. In the embryo, the left epidermal eye appears first. Subsequently, the right epidermal eye appears, and within hours it sinks into the parenchyma and turns into a cerebral eye. Newly hatched Götte's larvae possess both the left epidermal and the right cerebral eye. Three days after hatching, an incomplete eye appears adjacent to the left epidermal eye. The left cerebral eye then originates from this incomplete eye as it sinks into the parenchyma. This third eye is believed to originate through a process of induction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046238
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    Paper (German National Licenses)
    Fulltext
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