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Devonian trilobites of Gondwana studied with newer mathematical models to determine evolutionary connections https://phys.org/news/2019-01-reconstruction-trilobite-ancestral-range-southern.amp

I was looking through some fossils on an auction house website, when I saw some dinosaur eggs labelled as saltasaurus or argentinosaurus. Does anyone have any views on it?

https://phys.org/news/2019-01-fossil-prehistoric-deer-argentina.html

Alright all you smarty pants, (and thats a good thing), i got this about 20 years ago with a batch of other teeth from south america. I have no idea as to what kind of tooth this is. Any help is greatly apppreciated. Thanks a ton. RB

Find the source HERE. Additional Links: Discover Magazine.

Hello, my name is Andres. I found this in "La Pedrera beach" in Uruguay. At first I had no clue of what it was. I'm prone to think it is a sponge fossil, but would want help in this matter. I found it vaguely buried in the sand close to the shore. The sand of that beach is grainy and loaded with lots of shells of many mollusc species. If it is indeed a sponge fossil, what species it would be? Thanks in advance!

An amazingly well-preserved Jurassic rhamporhyncoid pterosaur known as Allkauren koi has been discovered in South America. Here is the article from SciNews: Pterosaurs were highly successful flying reptiles that lived between 210 million and 65 million years ago. These creatures were Earth’s first winged vertebrates, with birds and bats making their appearances much later. They first appeared in the Late Triassic and went on to achieve high levels of morphologic and taxonomic diversity during the Mesozoic era, with more than 150 species recognized so far. Pterosaurs have traditionally been divided into two major groups: the primitive, primarily long-tailed rhamphorhynchoids (preferably currently recognized as non-pterodactyloids) and the derived short-tailed pterodactyloids. They had an extraordinary adaptation to flight, including pneumatic bones to lighten its weight, and an elongated digit supporting a wing membrane. Some were the largest flying animals of all time, with wingspans exceeding 30 feet. Pterosaurs are not rare in the fossil record, but their neuroanatomy is known from only a few three dimensionally preserved remains and, until now, there was no information on the intermediate forms. Named Allkauren koi, the newly-discovered winged reptile is represented by several skeletal elements including an almost perfect, three-dimensionally preserved braincase that shows a unique combination of characters shared with both pterodactyloids and breviquartossans (non-pterodactyloids). The fossilized material comes from a single locality within the Cañadón Asfalto Formation in northern central Chubut Province, Patagonia, Argentina. “Allkauren koi, from the middle lower Jurassic limit, shows an intermediate state in the brain evolution of pterosaurs and their adaptations to the aerial environment,” said Dr. Diego Pol, a paleontologist at the Museum of Paleontology Egidio Feruglio in Trelew, Chubut, Argentina. “As a result, this research makes an important contribution to the understanding of the evolution of all of pterosaurs.” Life restoration: Skeletal elements:

These are gifts that my father bought for me in his trip to Brazil more than 20 years ago. Knowing the country, I request this ID assuming what I have is probably fake. Attached photos. 2 specimen, I think both actually exist in present time.

Hi people! A friend of mine collected the astragalus of the photo from a fossiliferous site with Pleistocene mammals in southern Brazil. Although we have a large collection of fossils at the university, we couldn't identify it. We have already excluded horses, tapirs, ground sloths, sabertooth cats...could it be a bear or possibly a mastodont?