Phylum Arthropoda, Class Trilobita
Abstract
Description
Cambrian. The first appearance of trilobites defines the start of Series 2 of the Cambrian, and they can be found in strata up to the upper Permian, after which trilobites (among a large number of marine organisms) went extinct in the great catastrophe that removed over 90% of all species on earth. The greatest numbers of trilobite species occurred during the Cambrian and Ordovician periods, after which trilobite extinction trends exceeded radiation events.
item.page.type
natural object
StillImage
StillImage
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image/jpeg
Keywords
environmental sciences