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Monociliary receptors in interstitial Proseriata and Neorhabdocoela (Turbellaria Neoophora)

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Summary

The ultrastructure of monociliary receptors in 10 species of the Proseriata and Neorhabdocoela is described, with particular reference to the epidermal dendritic part.

Sensory cells with a single kinocilium situated at the level of the distal epidermis membrane are considered as mechano- or chemoreceptors.

There exist sensory cells with a dendrite penetrating one epidermis cell and bearing an embedded kinocilium and a collar of 8 stereocilia or ridges with a fribrillose substructure. These collared receptors probably function as mechanoreceptors.

In comparison with collared sensory cells in species of other turbellarian orders, the embedded receptors in the Proseriata and Neorhabdocoela are more advanced and possess synapomorphous characteristics. With the embedded receptors a new evidence is given for the close phylogenetic relationship between the Proseriata and Neorhabdocoela.

The distribution of collared cells in the animal system and their phylogenetic implication for a choanoflagellate origin of the Metazoa are briefly discussed.

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Abbreviations

ar:

annular rootlet

bm:

basement membrane

cb:

crystalline body

cc:

collar cell

cw:

cell web

cwt:

cell web-thickening

d:

dendrite

kc:

kinocilium

lm:

longitudinal musculature

mv:

microvilli

n:

nerve

nt:

neurotubuli

pb:

parenchymal branches

r:

rootlet

rd:

ridges

rh:

rhabdite

rm:

ring musculature

sc:

stereocilia

sd:

septate desmosomes

tm:

transversal musculature

u:

ultrarhabdites

za:

zonula adhaerens

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

    Ulrich Ehlers & Beate Ehlers

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Ehlers, U., Ehlers, B. Monociliary receptors in interstitial Proseriata and Neorhabdocoela (Turbellaria Neoophora). Zoomorphologie 86, 197–222 (1977). https://doi.org/10.1007/BF00993666

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