Read e-book online A guide to 1,000 foraminifera from southwestern Pacific : PDF

By Jean-Pierre Debenay

ISBN-10: 2709917297

ISBN-13: 9782709917292

ISBN-10: 2856536980

ISBN-13: 9782856536988

Numbering approximately 10000 species, Foraminifera represent the main diversified workforce of shelled microorganisms within the ocean. also they are the most invaluable instruments for environmental review and tracking courses. This advisor via Jean-Pierre Debenay presents an outline of the environmental stipulations round New Caledonia, an obtainable creation to Foraminifera, and a precis of the study that has been conducted from the island kingdom. It additionally describes a couple of thousand species of Foraminifera gathered round New Caledonia, accompanying every one access with SEM micrographs and notes on its distribution. geared up into teams to make it effortless to spot every one species, it is going to be a pragmatic reference.

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Extra info for A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia

Example text

35). Nummulites venusta is mostly found in the depressions of the lagoon, together with other, most widely distributed species. Heterolepa praecincta is hardly found farther northwest than Nouméa peninsula. Other species, such as Amphistegina radiata, show the same tendency (fig. , Pseudomassilina australis and Quinqueloculina agglutinans) have an inverse distribution, being hardly found farther southeast than Nouméa peninsula (fig. 36). The information given by the maps is synthesized in table 2.

Agglutinated foraminifera with brownish organic cement are quite easy to recognize, but agglutinated tests with calcareous cement may be difficult to distinguish from porcelaneous tests that are covered with a surface layer of arenaceous material. Generally, however, 1 | Figure 49 2 1 Typical white and opaque porcelaneous test; 2 Translucent porcelaneous test; 3 Typical transparents and shiny hyaline test; 4 Whitish and translucent hyaline test. Scale bar = 100 µm. 3 1 2 | Figure 50 1 Reophax, an agglutinated foraminifera; 2 Nubeculina, a porcelaneous foraminifera with a coating of agglutinated grains.

Brief descriptions of external morphological characters are given to assist in the correct identification of species and its generic placement. As often as possible, the description is directly based on the original type description, or on a publication that has referred to the original description and figures. Even if some illustrations may slightly differ from the description, due to intraspecific or ecophenotypic variation, the descriptive information has not been altered, since it would be very useful having all of the descriptive information at hand to check identifications when using this book as a guide, as it is intended.

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A guide to 1,000 foraminifera from southwestern Pacific : New Caledonia by Jean-Pierre Debenay

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