Dear Kitty. Some blog

This 2017 video from the USA is called Elrathia kingi – Trilobite Fossil.

From the American Museum of Natural History:

Growth rate of common trilobites

July 15, 2020

If you’ve ever held a trilobite fossil, seen one in a classroom, or walked by one in a store, chances are it was Elrathia kingii, one of the most common and well-recognized trilobites, and collected by the hundreds of thousands in western Utah. But despite the popularity of this species, scientists had not determined how it grew — from hatchling to juvenile to adult — until now. New work from the American Museum of Natural History published today in the journal Papers in Palaeontology describes the development and growth rate of Elrathia kingii — only the second such dataset to be compiled for a trilobite — allowing for the first comparison among trilobite species.

“There’s quite a big size range among…

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