SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Brachiopods. Assemblage of fossil brachiopod shells from the Jurassic Period (195-140 million years ago). Here Terebratula sp. are seen as the smooth shells, with the smaller ribbed shells being Rynchonella sp. 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. Magnification: x0.5 at 6x4.5cm size.
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