A black trilobite fossil on a gray background. Text below it reads "Asahpiscus wheeleri. +500 million years old. Trilobite. From: Utah".

Elrathia kingii Trilobite (ID#2)

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This is a great, affordable trilobite for the beginning collector! 

Scientific Name:  Elrathia kingii

From:  Utah

Age:  +500 million years old

Approximate Dimensions:  1.5  X  1,25"

Trilobites are a group of extinct fossil arthropods.  (Modern day arthropods include insects, spiders, lobsters and centipedes.)  Members of this  group are easily recognized by their distinctive three-lobed, three-segmented form. Horseshoe crabs are the closest living relative of trilobites. There were over 20,000 different species of trilobites. Trilobites were exclusively marine animals and  existed from the beginning of the Cambrian Period (about 542 million years ago) when they dominated the seas, to the end of the Permian Period (250 million years ago).