SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Brachiopods. Fossil brachiopod shells from the Silurian Period (435-395 million years ago). Among an assemblage of other smaller aquatic fossils, the brachiopods are the ribbed shells. 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 Wenlock limestone quarry at Shadwell in Shropshire, UK. Magnification: x0.5 at 6x4.5cm size.
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