Trilobites are an extinct group of marine arthropods that first appeared 526 million years ago (early Cambrian). They survived for 275 million years, but then died out - a casualty of the mass extinctions at the end of the Permian period. So far, 17,000 species of trilobite have been recognised. The study of these species is important to the fields of evolutionary biology and biostratigraphy. Further details here, here and here.

Credits: Sedgwick Museum, Cambridge

SEM views

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Specimen 1
View 1RMS-SEM-Trilobite1.html
View 2RMS-SEM-Trilobite2.html

18 cm in length

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Trilobites are the dominant bottom-feeding

species in this Silurian sea-floor scene

Trilobite with bulbous

head shield and large compound eyes

Coiled trilobites

Specimen 2

Encrinurus variolaris

Calymene blumenbachi

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