Five bivalve fossils
(Top) Chlamys fibrosa; (Centre left) Chlamys splendens; (Centre right) Perampliata ampliata; (Lower left) Mytilus ungulatus; (Lower right) Trigonia reticulata. Bivalves first appeared in the Middle Cambrian.
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Photo credit: © Natural History Museum, London / Alamy / Afripics
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Keywords: animal, bivalve, bivalvia, chlamys, fossil, fossilised, fossils, groove, grooved, group, invertebrata, invertebrate, lamellibranch, lamellibranchia, marine, mollusc, mollusca, mollusk, mytilidae, mytiloida, mytilus, ostreoida, oyster, pectinidae, perampliata, ridge, scallop, selection, shell, trigonia
