FIG. 3 in Middle Devonian Calceola sandalina (Linnaeus, 1771) (Anthozoa, Rugosa) from Moravia (Czech Republic): aspects of functional morphology, gerontic growth patterns, and epibionts

FIG. 3. — Freeing of Calceola out of the sediment; A, coral deep in sediment; B, center of gravity shifts forward and calice moves downward by opening the operculum, apex moves upward and sediment particles pour under apical part; C, operculum close, center of gravity shifts backward, calice moves upward and sediment particles pour under calicinal part. Animal moved upward.