SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Group of fossil brachiopods, Dalmanella sp., from the Ordovician Period (approximately 500-435 million years ago). Brachiopods are sessile marine invertebrates which have a bivalve shell and bear a number of ciliated tentacles around the mouth. The shell resembles that of a bivalve mollusc but the structure of the body is quite different and the animals are placed in a separate phylum, the Brachiopoda. Brachiopods were very common in Palaeozoic and Mesozoic times, but only a few species survive today. This specimen was found in the Acton Scott series of sediments.
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