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Ultrastruktur potentiell photoreceptorischer Zellen unterschiedlicher Organisation bei einem Proseriat (Plathelminthes)

Ultrastructure of potential photoreceptor cells of a different organization in a proseriate (Platyhelminthes)

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Summary

Two cells which lie at the left and at the right near the anterior end of Cirrifera aculeata (Ax, 1951) (Proseriata) are interpreted as presumed photoreceptors.

In the left cell up to 70 slightly modified cilia extend into a large intracellular cavity. Besides these cilia microvilli and electron-dense granules are present. The presumed light sensitive structures of the right cell are formed by tubular vacuoles which are arranged without gaps, thus comparable to the microvilli of a rhabdom. The functional and evolutionary aspects of these two cell types are discussed.

Zusammenfassung

Zwei links und rechts im Vorderkörper von Cirrifera aculeata (Ax, 1951) (Proseriata) gelegene Zellen werden als mögliche Photoreceptoren angesprochen. In ein großes intracelluläres Lumen der linken Zelle ragen über 70 nur leicht modifizierte Cilien, daneben treten Mikrovilli und elektronendichte Granula auf. Die vermutlich lichtsensitiven Strukturen der rechten Zelle bilden dicht nebeneinander liegende röhrenartige Vakuolen, vergleichbar den Mikrovilli eines Rhabdoms. Die funktionellen und evolutiven Aspekte dieser beiden bisher unbekannten Zelltypen werden diskutiert.

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Abbreviations

bk :

Basalkörper

bl :

Basallamina

c :

Gehirn

ci :

Cilien

cn :

Centriol

ep :

Epidermis

ic :

Intercellularsubstanz

lm :

Längsmuskulatur

mv :

Mikrovilli

my :

Myofibrillen

nv :

Nervenzelle

pr :

Pseudorhabdomeren

rm :

Ringmuskulatur

sk :

Sehkolben

st :

Statocyste

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Authors and Affiliations

  1. II. Zoologisches Institut und Museum der Universität, Berliner Str. 28, D-3400, Göttingen, Bundesrepublik Deutschland

    Beate Sopott-Ehlers

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  1. Beate Sopott-Ehlers
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Die Arbeit wurde durch Mittel der Akademie der Wissenschaft und der Literatur in Mainz gefördert. — Für technische Assistenz danke ich Frl. E. Hildenhagen

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Sopott-Ehlers, B. Ultrastruktur potentiell photoreceptorischer Zellen unterschiedlicher Organisation bei einem Proseriat (Plathelminthes). Zoomorphology 101, 165–175 (1982). https://doi.org/10.1007/BF00312431

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  • DOI: https://doi.org/10.1007/BF00312431

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