The Ultrastructure and Functional Morphology of a Captaculum inGraptacme calamus(Mollusca, Scaphopoda)
作者:
C. A. Byrum,
E. E. Ruppert,
期刊:
Acta Zoologica
(WILEY Available online 1994)
卷期:
Volume 75,
issue 1
页码: 37-46
ISSN:0001-7272
年代: 1994
DOI:10.1111/j.1463-6395.1994.tb00960.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
AbstractThe structure and function of the captaculum inGraptacme calamuswere studied using light microscopy, videomicrography, and transmission electron microscopy.Graptacme calamusutilizes a longitudinal ciliary band to transport small food particles along the outstretched filament. The head of the captaculum, which bears the alveolar indentation, contains a large ganglion, at least three types of gland cells, circular and longitudinal muscles, and connective tissue. It is likely that gland 1 secretes mucus which is used in the transport of food particles and that gland 2 secretes material which promotes adhesion of the alveolus to the substratum. The function of gland 3 is unknown. Critical observation of the captaculum surface revealed that the cilia of the alveolar region have truncated tips unlike those found on other regions of the captaculum. These alveolar cilia probably aid in the distribution of adhesive substance and in adhesion.
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