By Professor Jean-Claude Gall (auth.)
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Common geology -- Correlation and naming -- Micropalaeontology -- Ediacarans -- physique plans -- practical morphology -- Precambrian-Cambrian transition -- brief papers -- Index
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Additional resources for Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology
The microphagous diet is characterised by the absence of chewable pieces. It is often associated with a sedentary or barely mo bile mode of life. Several fixed suspension feeders belonging to various groups develop cone-shaped shells or skeletons whose opening is orientated towards the water surface. Within especially dense populations, such an orientation allows efficient interception of food particles in suspension. This is a good example of morphological convergence (Fig. 10). Fig. lOA-I. Cone-shaped tests in various suspension-feeding organisms.
In many cases, this makes it possible to distinguish between a dwarf population (small sized adults whose growth has been impeded) and a juvenile population (accumulation of young stages). V. Behaviour Ethology, the study of the behaviour and habits of fossil organisms, often lends itself to highly imaginative reconstructions, above all where a group is now extinct. Within the last twenty years, research on the mechanical significance of morphological peculiarities and the construction of artificial models has enabled us to understand the modes of life of fossil species much more clearly.
The two pairs of wings in insects are a membraneous expansion of the dorsal side of the thorax. They are lost in parasitic species. 3 a,e p R 4 p 5 Fig. 9. Adaptations of fore-limbs in tetrapod vertebrates. 1 for flight (bat); 2 for swimming (ichthyosaur); 3 for gripping (opossum); 4 for running (horse); 5 for burrowing (mole). H humerus; R radius; C cubitus; P phalanges (finger- and toe-joints). (1 and 5 from Grasse 1967,2, 3 and 4 from Devilliers 1973) 2 R H I:r. - 'Tl CJ} 12 Modes of Life Vertebrate wings are altered fore-limbs (Fig.
Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology by Professor Jean-Claude Gall (auth.)