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Ancient Dogs, Bear-dogs & Direwolves
Ancient Dogs, Bear-dogs & Direwolves
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Ancient Dogs, Bear-dogs & Direwolves
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A scene during the late Pleistocene in western North America a Dure Wolf (Canis dirus) calls for its pack while a herd of Columbian mammoths ambles past in the background. Book Dogs their fossil relatives & evolutionary history (Xiaoming Wang and Richard Tedford)
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https://www.sciencedaily.com/releases/20...122514.htm
Fossil dog: New species roamed eastern North America 12 million years ago Date:
May 11, 2016Source:
University of PennsylvaniaSummary:
A doctoral student at the University of Pennsylvania has identified a new species of fossil dog. The specimen, found in Maryland, would have roamed the coast of eastern North America approximately 12 million years ago, at a time when massive sharks like megalodon swam in the oceans. The newly named species is Cynarctus wangi, named for Xiaoming Wang, curator at the Natural History Museum of Los Angeles County and an expert on mammalian carnivores. This coyote-sized dog was a member of the extinct subfamily Borophaginae, commonly known as bone-crushing dogs because of their powerful jaws and broad teeth. "In this respect they are believed to have behaved in a similar way to hyenas today," said the study's lead author, Steven E. Jasinski, a student in the Department of Earth and Environmental Science in Penn's School of Arts & Sciences and acting curator of paleontology and geology at the State Museum of Pennsylvania in Harrisburg. Fossils from terrestrial species from this region and time period are relatively rare, thus the find helps paleontologists fill in important missing pieces about what prehistoric life was like on North American's East Coast. "Most fossils known from this time period represent marine animals, who become fossilized more easily than animals on land," Jasinski said. "It is quite rare we find fossils from land animals in this region during this time, but each one provides important information for what life was like then." Jasinski, who is advised by Peter Dodson, a professor of paleontology in the Department of Earth and Environmental Science and professor of anatomy in the School of Veterinary Medicine, collaborated on the paper with Steven C. Wallace, a professor at East Tennessee State University and curator at the East Tennessee State University National History Museum at the Gray Fossil Site. Their work was published in the Journal of Paleontology. When Jasinski and Wallace first began their investigation of the specimen, which had been found by an amateur collector along the beach under the Choptank Formation in Maryland's Calvert Cliffs region and was then held by the Smithsonian Institution, they presumed it was a known species of borophagine dog, a species called marylandica that was questionably referred to as Cynarctus, a fossil of which had been found in older sediment in the same area. But when they compared features of the occlusal surfaces, where the top and bottom teeth meet, of the previously known and the new specimens, they found notable differences. They concluded that the specimen represented a distinct species new to science. "It looks like it might be a distant relative descended from the previously known borophagine," Jasinski said. Borophagine dogs were widespread and diverse in North America from around 30 million to about 10 million years ago. The last members went extinct around 2 millions of years ago during the late Pliocene. C. wangi represents one of the last surviving borophagines and was likely outcompeted by ancestors of some of the canines living today: wolves, coyotes and foxes. Despite its strong jaws, the researchers believe C. wangi wouldn't have been wholly reliant on meat to sustain itself. "Based on its teeth, probably only about a third of its diet would have been meat," Jasinski said. "It would have supplemented that by eating plants or insects, living more like a mini-bear than like a dog." Although C. wangi represents the first known carnivore from the Choptank Formation, some of the animals that it would have lived beside are known. These include the ancient pigs Desmathyus and Prosthenops, the horned artiodactyl Prosynthetoceras, an ancient elephant-like animal known as a gomphothere, and perhaps the ancient horse Merychippus. "This new dog gives us useful insight into the ecosystem of eastern North America between 12 and 13 million years ago," Jasinski said. The study was supported in part by the National Science Foundation (EAR-0958985), East Tennessee State University, the State Museum of Pennsylvania and the University of Pennsylvania. 
Ecomorphology of giant bear-dogs
Cast skeleton of Amphicyon at Raymond Alf Museum of Paleontology  *This image is copyright of its original author https://www.researchgate.net/publication...schyrocyon @tigerluver @GrizzlyClaws @GuateGojira A big skull of Amphicyon has a Basal length of 452,0 (mm) a lot larger than Panthera atrox used for comparison in this paper, I think you can estimate Greatest skull length of that big individual.
The skeleton of Amphicyon on display in American Museum of Natural History
http://www.nationalgeographic.com  *This image is copyright of its original author
Painting by Velizar Simeonovsky:
 *This image is copyright of its original author
Head of Giant Wolf that died 40000 years ago it was found in Yukatia Russia in 2018, it was a very big wolf the head measures 40 cent long a lot larger than today's wolf that measure about 30 cent long. credit to The Siberian Times
 *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author  *This image is copyright of its original author
Picture of Giant Prehistoric Wolf discovered in Yukatia Russia in 2018 compared with modern day Gray Wolf
 *This image is copyright of its original author
Amphicyon by Julio Lacerda and Amphicyon ingens skeleton
Credit to @evolution_soup  *This image is copyright of its original author  *This image is copyright of its original author
Amphicyon major skull exhibited in Museum national de histoire naturelle
Credit to @chasingmammoth  *This image is copyright of its original author I am waiting for information of measurements of this skull, hope they send me that valuable information |
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