By Professor Jean-Claude Gall (auth.)
Read or Download Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology PDF
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Additional resources for Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology
28. Shell of conchostracan crustacean (estheriid) from the Bunter Sandstone of the Vosges containing eggs Insect eggs (Fig. 109) have been described from the same horizon in the Bunter of the Vosges. 25 mm, are encased in a chitinous shell which opens along a median slit (Fig. 29). The clutches contain up to 3000 eggs joined together by mucilage. Depending on genus, these are laid out like beads on a necklace or stuck together in a lump like those of present day chironomids. It is possible to work out the internal structures and their relation to the Reptiles Fig.
20, 114). Such adaptations are known in red algae, scleractinians, molluscs, bryozoans, etc. In reef environments, massive corals offering little resistance to the waves are dominant in shallow, turbulent water. In deeper, calmer water, much more fragile, branching forms are developed. From such observations, Lecompte recognised d bathymetric zonation in the Devonian reefs of the Ardennes. The Recent gastropod, Patella vuigata, also shows a variation in shape depending on the hydrodynamics of its environment.
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. A Jurassic sponge (Tremaclictyon); B Cambrian archaeocyathid; C Palaeozoic conularid; D Jurassic hexacoral (Montlivaltia); E Permian brachiopod (Richthofenia); F Cretaceous bivalve (Hippurites); G Tertiary gastropod (Rothplezia); H Tertiary cirripede crustacean (Pyrgoma); I Ordovician echinoderms (Cyathocystis).