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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Stammers, Sinclair |
Taille de l’image : | 3902 px × 2526 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |