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Acanthochonia

The receptaculitids are globe-shaped fossils composed of a series of elements with rhomboidal ends, originating from the center. The wall of the head consists of spirally arranged diamond-shaped plates. The thallus wall itself was calcified, rather than having a mucillage covering, as in other calcareous algae. In life the axis anchored the plant to rocks or reef corals. Copyright 1992 Dorling Kindersley Limited London Text copyright 1992 Cyril Walker, David Ward .