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  • 1970-1974  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Sponge burrowing: Fine structure of Cliona lampa penetrating calcareous substrata (1973)
    Springer
    Marine biology 21 (1973), S. 144-162 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cliona lampa Laubenfels (Porifera: Hadromerida), a common burrowing organism in Bermuda, has been used to study the method of sponge penetration into calcareous objects. To progress beyond the results obtained by previous authors, electron-microscope techniques, in addition to light-microscope observations, were employed. Burrowing patterns, fine structure of the tissue-substratum interface and of calcareous fragments removed by sponge activity are described on the basis of scanning electron microscopy. Cell types and cytological features have been identified by light and transmission electron microscope. One cell type of archeocyte origin is demonstrated; it carves out chips of calcium carbonate (and conchiolin) by means of filopodial extensions and etching secretions. The cells undergo plasmolysis during this process; the substratum chips are expelled through the exhalent canal system. It is calculated that only 2 to 3% of the eroded material is removed in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354611
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Additional notes on Tubiluchus corallicola (Priapulida), based on scanning electron microscope observations (1973)
    Springer
    Marine biology 20 (1973), S. 78-87 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cuticular differentiations on the body surface and the pharyngeal armature of adult Tubiluchus corallicola van der Land were examined with the scanning electron microscope. The morphology of abdominal tumuli, flosculi and tubuli, and of pectinate teeth and fimbrillae on the pharynx is described, and an attempt is made to interpret their functional properties. Taking into account the structural details, relative size, and topographic arrangement in relevance to interaction with the interstitial environment, we assume that tumuli are protective, flosculi chemoreceptive, and tubuli adhesive, and that the pharyngeal armature is a scraping mechanism for feeding on epigrowth on sand grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387678
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    Paper (German National Licenses)
    Fulltext
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