Fine structure of the cephalic sensory organ in veliger larvae of Littorina littorea, (L.) (Mesogastropoda,Littorinidae) |
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Authors: | Daniela Uthe |
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Institution: | 1. Institut für Spezielle Zoologie & Vergleichende Embryologie der Universit?t Münster, Hüfferstrasse 1, D-48149, Münster, Germany
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Abstract: | The cephalic sensory organ (CSO) in planktonic veliger larvae of Littorina littorea is situated dorsally between the velar lobes at the level of the shell aperture. It consists of ciliated primary sensory
cells, adjacent accessory cells and supporting epithelial cells. Cell bodies of the ciliated cells originate in the cerebral
commissure and their dendrites pass to the epidermis. The flask-shaped sensory cells are characterized by a deep invaginated
lumen with modified cilia arising from the cell surface in the lumen. These cilia are presumed to be non-motile because they
lack striated rootlets and show a modified microtubular pattern (6 + 2, 7 + 2 and 8 + 2). The adjacent accessory cells never
possess an invaginated lumen; occasionally cilia and branched microvilli arise from the apical surface. These cells may be
sensory, but there is no obvious direct connection with the nervous system. The supporting epithelial cells are part of the
epidermis and flank the apical necks of the sensory and accessory cells. Morphological evidence suggests that the CSO may
function in chemoreception related to substrate selection at settlement, feeding or other behaviour. |
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Keywords: | Littorina littorea veliger ultrastructure cephalic sensory organ ciliated sensory cells |
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