SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Brachiopods. Assemblage of fossil brachiopods Dalmanella sp., from the Ordovician Period (500- 435 million years ago). Dalmanella sp. are seen as the ribbed shells; a few larger Orthis sp. shells are also present. Brachiopods are sessile marine invertebrates which have a bivalve shell and bear a number of ciliated tentacles around the mouth. Although the shell resembles that of other bivalve molluscs, the structure of the brachiopod body is quite different. Brachiopods were very common in Palaeozoic and Mesozoic times, but only a few species survive today. Photographed at the Acton Scott beds at Cardington in Shropshire, UK. Magnification: x0.5 at 6x4.5cm size.
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