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Фораминифера (Foraminifera) | |
 | Каталог / Природа / Жизнь / Протоктисты (Protoctistae) / Одноклеточные эукариоты (Protista) / Фораминифера (Foraminifera) |
| Каталог / Природа / Жизнь / Протоктисты (Protoctistae) / Одноклеточные эукариоты (Protista) / Корненожки (Rhizopoda) / Фораминифера (Foraminifera) |
| Каталог / Природа / Жизнь / Протоктисты (Protoctistae) / Одноклеточные эукариоты (Protista) / Granuloreticulosa / Фораминифера (Foraminifera) |
 | Allogromiida [16] |
| Miliolida [57] |
| Textulariida [112] |
| Carterinida [3] |
| Rotaliida [339] | ||
| Lagenida [27] |
| Spirillinida [9] |
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Global deep-sea extinctions during the Pleistocene ice ages
The dark, near-freezing environment of the deep oceans is regarded as one of the most stable habitats on Earth, and this stability is generally reflected in the slow turnover rates (extinctions and appearances) of the organisms that live there. By far the best fossil record of deep-sea organisms is provided by the shells of benthic foraminifera (Protista). A little-known global extinction of deep-sea benthic foraminifera occurred during the Pleistocene ice ages. [eng] |
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Miocene foraminifera from Lakes Entrance Oil Shaft, Gippsland, southeastern Australia
The Lakes Entrance Oil Shaft is the most complete and best sampled Neogene onshore section in southern Australia. A detailed study of the benthic and planktonic foraminifera in the shaft samples provides insights towards a better understanding of the Miocene climatic variations in the region. Faunal evidence of a second order (107 years) oscillation and a series of fluctuations at the third order (106 years) scale is apparent, not only in simple measurements of species diversity and abundance, but also in multivariate analyses of a database of some 68,000 specimens belonging to 65 planktonic and 410 benthic species. [eng] |
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The Collection and Mounting of Foraminifera
Images by Jan Parmentier (NL), Text By Brian Darnton (GB). The Foraminifera have been known to microscopists since the time of van Leeuwenhoek, but very few people actually seem to collect them. In the study of geology and within the petroleum industry in particular, fossil deposits have become familiar markers of time periods and allied climate in the earth's crust. Living creatures are to be found in marine conditions from the ooze of the deepest ocean to the seaweed's of the littoral zone. [eng] |
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What are Foraminifera?
Foraminifera (foraminifers or, informally, just forams) are single-celled amoeboid protists. Modern taxonomies rank the group as a phylum or subphylum. The principal characteristics of the taxon are (1) threadlike anastomosing pseudopodia bearing granules that reveal constant bidirectional streaming of the cytoplasm (granuloreticulopodia); (2) the life history characterized by an alteration of sexual and asexual generations with meiosis associated with the asexual reproduction - a feature unique in heterotrophic eukaryotes; and (3) the presence of a test (shell). [eng] |
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Fossil Groups - Benthic Foraminifers
Benthic foraminiferal morphologies are very diverse, from simple single-chambered to multi-chambered, complex forms composed of calcite or mineral grains. The benthic foraminifera utilize rhizopodia extended through single or multiple apertures and test perforations for gathering prey and locomotion. [eng] |
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