Implications de données récentes sur les Lingules actuelles dans les interprétations paléoécologiques

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Abstract
Some traditional concepts on lingulid paleoecology are reviewed and discussed in regard to new data on the ecology of Recent lingulid brachiopods. Fossilization in life-position occurs under several ecological conditions, e.g., dessication or emersion of the substratum, prolonged increase in salinity, perhaps very rapid sedimentation, extreme changes in temperature and fossilization of flat-lying shells occurs under prolonged reduction in salinity, storms and natural death. Catastrophic environmental changes cause the fossilization of lingulids. Such events may affect 1 or more ecological features which may have a direct or indirect effect on the lingulid biology. The biotype does not correspond to the habitual one and the survival and behavior of the lingulids depend on the severity of the environmental changes and on the tolerance of the animals to the latter.