Paleontological aspects of Cliona celata from the Dutch Delta Region were investigated. This tunneling sponge occurs abundantly in limestone boulders and in shells of Ostrea edulis, Crassostrea gigas and Crepidula fornicata. Ostial and oscular papillae protrude from the substratum surface through perforations. All found spicules are tylostyles. The length of the tylostyles prepared from ostial papillae is positively correlated with the diameter of the perforations which contain these papillae. The tylostyle diameter is not correlated with the perforation size. Reproduction apparently is mainly asexual. Excavation patterns in the substrata are described. Mathematical models of perforation-rates and -patterns are applied to describe the relative age of sponge parts in oyster-shells. Interactions of sponge tunneling with borings of 2 polychaete worms, Polydora ciliata and P. hoplura, are studied. In the Dutch Delta Region only the .alpha- and beta-stage of Cliona celata are found. The .gamma.-stage was collected near Roscoff, France, to measure tylostyle length and papillae distribution. 31 pp., 5 pls, 6 figs, 4 tabs, gr. 8.

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Title: Excavation Patterns and Spiculae Dimensions of the Boring Sponge Cliona celata from the SW Netherlands
Publication Date: 1983

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Founded in 1985 we are specialized in worldwide literature on Mollusca and marine invertebrates. Our publishing house has meanwhile published approximately 60 titles on that field of interest. We have stocks of most available international books on Malacology and a huge amount of antiquarian literature, even of the latter most titles are only available once.

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