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Ptilodictya-sea mat

Ptilodictya-sea mat This consists of a single branch, straight or gently curved, and diomond-shaped in cross section, with a median wall butting box-shaped zooids from both sides. The zooids are rectangular in outline, arranged in longitudinal rows on the branch surface. At the pointed end of the branch is a conical structure, that fitted into a socket on the encrusting base of the colony, permitting the branch to articulate. Habitat -- Ptilodictya lived in the sea with the encrusting base cemented to the hardgrounds. Remark -- This specimen has a brachiopod lying next to it. Copyright © 1992 Dorling Kindersley Limited, London Text copyright © 1992 Cyril Walker, David Ward .