Journal of Paleontology

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A Devonian pterygotid eurypterid playground in China.

Pterygotids (Eurypterida; Pterygotidae), known more commonly as ancient sea scorpions, were large apex predators of the Silurian-Devonian marine realm, and included some of the largest arthropods in Earth’s history, with some species reaching up to 2.5 meters in length. They are the only family of eurypterids to be found globally in marine deposits owing to their domination of the Mid-Palaeozoic seas.

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Crinoid survivors bounce back in the aftermath of the Late Ordovician Mass Extinction

The Late Ordovician Mass Extinction (LOME) was the second largest mass extinction of the ‘Big Five’ extinctions in Earth’s history, responsible for the loss of approximately 85% of marine species. Following an important diversification in the middle Ordovician, crinoids experienced substantial loss during the LOME, and species saw a significant decrease in body size, known in paleontology as the ‘Lilliput Effect’.

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New wallaby-sized dinosaur from the ancient Australian-Antarctic rift valley

Upper jaws of a new dinosaur from Victoria, Australia, give fresh insight into the diversity of small herbivorous dinosaurs that once inhabited the ancient Australian-Antarctic rift valley 125 million years ago A new, wallaby-sized herbivorous dinosaur has been identified from five fossilized upper jaws in 125 million year old rocks from the Cretaceous period of Victoria, southeastern Australia.…

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