Bivalve fossils. Bivalves are shelled molluscs that first appeared in the Middle Cambrian and are still common in today's seas and oceans. These speci

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Bivalve fossils. Bivalves are shelled molluscs that first appeared in the Middle Cambrian and are still common in today's seas and oceans. These specimens are: Chlamys fibrosa (top); Chlamys splendens (centre left); Perampliata ampliata (centre right); Mytilus ungulatus (lower left); Trigonia reticulata (lower right). They are part of the collections held at the Natural History Museum, London, UK.

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