Actuopalaeontology is a modern discipline in geosciences. Having in mind that physical processes (e.g. hydrodynamics, sediment transport, climate, …..) as well as biologic and ecologic processes (e.g. inter- and intraspecific interaction, metabolism, behaviour, …..) in the past must have been similar to those occuring in recent environment the actualistic approach is an essential field of research in the geosciences. The results of actualistic studies allow detailed but critical reconstructions in palaeoecology, palaeogeography and of the palaeoenvironment.