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A presumptive ciliary photoreceptor in larval Gyrocotyle urna Grube and Wagener (Cestoda)

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Summary

The fine structure of a paired lamellate body in the anterior region of the lycophora larva of Gyrocotyle urna is described. Each structure is built up by one specialized cell. Lamellae derive from membranes of about 15 cilia that protrude into an intracellular cavity. The lamellae divide into several flattened branches and are rolled up forming a whorl.

The lamellate body is presumed to have photoreceptory function. Comparative deliberations are made for similar structures within several platyhelminths.

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Abbreviations

bb :

basal body

ci :

cilium

cm :

circular muscles

cp :

ciliary photoreceptor

cs :

cytoplasmatic sheath

dg :

dark granules

em :

intercellular electron-dense material

ep :

ciliated epidermis

go :

gland opening of “striped granules”-gland

ic :

intracellular cavity

lb :

lamellate body

lg :

light-coloured granules

lh :

larval hooks

lm :

lamellae

lo :

longitudinal muscles

mi :

irregularly shaped mitochondria of the ciliophore cell

mw :

membranous structure of the adjacent cell

nc :

nerve cell

nu :

nucleus of ciliophore cell

rs :

rib-like structure

sg :

striped granules

ta :

tegument anlage

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Authors and Affiliations

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

    W. E. R. Xylander

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  1. W. E. R. Xylander
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Xylander, W.E.R. A presumptive ciliary photoreceptor in larval Gyrocotyle urna Grube and Wagener (Cestoda). Zoomorphology 104, 21–25 (1984). https://doi.org/10.1007/BF00312167

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  • DOI: https://doi.org/10.1007/BF00312167

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