The 366 daily episodes in 2014 were chronological snapshots of earth history, beginning with the Precambrian in January and on to the Cenozoic in December. You can find them all in the index in the right sidebar. In 2015, the daily episodes for each month were assembled into monthly packages, and a few new episodes were posted. Now, the blog/podcast is on a weekly schedule with diverse topics, and the Facebook Page showcases photos on Mineral Monday and Fossil Friday. Thanks for your interest!

Saturday, April 12, 2014

April 12. Silurian scorpion

Scorpions are among the oldest arachnids known. They date to the Silurian, but most of them were probably aquatic at that time. They had gills rather than lungs, and Silurian scorpions have been found in Great Britain and New York – which, you must remember, were not really very far apart during the Silurian. 

This 2008 paper has some great photos of fossil scorpions from the Silurian – showing pretty clearly that they haven’t changed much in more than 400 million years.

—Richard I. Gibson

Illustration from Extinct Animals by Sir Edwin Ray Lankester (1905, public domain)

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