Morphological adaptations of the late Mississippian problematic alga Calcifolium to fluctuating palaeoecologic environments



Well-preserved specimens of Calcifolium ? punctatum Maslov from the Guadiato area (Spain) show a great adaptability to environmental modifications. Six morphotypes are recognized: flabellum-shaped cups, massive erect cups, stockade cups, crustose growth, petals and inter-cup segments. These morphologies are an adaptative response to fluctuation of the following factors: substratum, light/turbidity/depth, competition for space, influx of micrite/rate of sedimentation, hydrodynamic energy and bioturbation.