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Post by brobear on Mar 23, 2019 9:58:35 GMT -5
Ursus ( ? ) tyrannus may have been the same as the steppe brown bear (Ursus arctos priscus). Or, he just might claim the name Ursus arctos tyrannus. It is even possible that we could all be fooled and it turns out to actually be a big polar bear. Hopefully, new evidence will be discovered. I will keep The Steppe brown bear and U. ( ? ) tyrannus together here until more is learned.
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Post by King Kodiak on Apr 30, 2019 6:00:39 GMT -5
Postcranial remains of Ursus arctos from the late Pleistocene of Los Rincones: a, right scapula in lateral view (Ri10/O14/39); b, right proximal part of ulna in lateral view (Ri10/O14/2); c, left radius in lateral view (Ri10/GL4/27, Ri10/GL4/5); d, right juvenile radius in lateral view (Ri10/O13/173); e, left coxal in lateral view (Ri10/O13/24); f, right humerus in cranial view (Ri10/O13/328); g and h, left proximal part of ulna in lateral view (Ri10/O13/35, Ri10/O13/406, Ri10/GL4/20); i and j, right femur in caudal view (Ri10/O14/46, Ri10/O13/138); k, right coxal in lateral view (Ri10/GL4/23); l, right proximal part of tibia in cranial view (Ri10/P13/6); m, left scapholunate in dorsal view (Ri10/O14/29); n, left Mtc I in dorsal view (Ri10/O13/9); o, right Mtc II in dorsal view (Ri10/O13/54); p, right Mtc IV in dorsal view (Ri10/O13/96); q, left Mtc V in dorsal view (Ri10/P13/2); r, right calcaneus in dorsal view (Ri10/O14/8); s, right Mtt I in dorsal view (Ri10/N11/42); t, right Mtt II in dorsal view (Ri10/O13/101); u, left Mtt II in dorsal view (Ri10/O14/17); v – aa, first phalanx in dorsal view (Ri10/O13/327, Ri10/O13/216, Ri10/O13/80, Ri10/O13/317, Ri10/N11/44, Ri10/GL1.19); ab – ad, second phalanx in dorsal view (Ri10/O13/241, Ri10/N10/154, Ri10/O15/1); ae, third phalanx in lateral view (Ri10/P13/7). www.researchgate.net/figure/Postcranial-remains-of-Ursus-arctos-from-the-Late-Pleistocene-of-Los-Rincones-a-right_fig4_268566384
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Post by brobear on Oct 28, 2019 13:08:22 GMT -5
Was Ursus ( ? ) Tyrannus a polar bear or a grizzly? Regardless, he was the biggest bear of the genus Ursus ever.
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Post by brobear on Oct 29, 2019 12:26:38 GMT -5
carnivora.net/viewtopic.php?f=8&t=5453&p=43632&hilit=steppe+brown+bear#p43632 Ursus (?) tyrannus Initially thought to be a Polar Bear, it may in fact be a Brown Bear from the late Pleistocene. The weight estimates have varied from 400 kg to 1,200 kg, but all they have to go on is a 48.5 cm ulna from a thought to be subadult, and a left mandible. Below is a hypothetical restoration: ( they're hypothetical restoration sucks ). Result of your conversion: 1200 kilograms is equal to 2,645.55 pounds (avoirdupois)
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Post by brobear on Oct 30, 2019 17:13:32 GMT -5
Ursus arctos tyrannus:
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Post by brobear on Oct 30, 2019 17:18:22 GMT -5
Bones:
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Post by OldGreenGrolar on Oct 30, 2019 17:27:41 GMT -5
If beleive the bones of am adult Ursus Maritimus will be denser and more robust than that of the sub adult bone in the picture above.
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Post by brobear on Oct 31, 2019 5:19:44 GMT -5
Ursus arctos tyrannus ( in polar bear form ) faces two cave bears... BY Jagroar
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Post by OldGreenGrolar on Oct 31, 2019 8:49:51 GMT -5
It seems Ursus arctos tyrannus does have some competition after all. Tyrannus seems to look calm here.
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Post by brobear on Oct 31, 2019 9:35:29 GMT -5
It seems Ursus arctos tyrannus does have some competition after all. Tyrannus seems to look calm here. No competition here. U. ( ? ) tyrannus / Steppe brown bear was mostly carnivorous whereas U. spelaeus was mostly ( if not completely ) vegetarian. In N. America we see the opposite. Arctodus simus is mostly carnivorous while Ursus arctos is most vegetarian. IF ( but unlikely ) tyrannus was a polar bear; then we have two predators in this picture.
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Post by King Kodiak on Oct 31, 2019 17:04:26 GMT -5
It seems Ursus arctos tyrannus does have some competition after all. Tyrannus seems to look calm here. No competition here. U. ( ? ) tyrannus / Steppe brown bear was mostly carnivorous whereas U. spelaeus was mostly ( if not completely ) vegetarian. In N. America we see the opposite. Arctodus simus is mostly carnivorous while Ursus arctos is most vegetarian. IF ( but unlikely ) tyrannus was a polar bear; then we have two predators in this picture. But the problem is, that i dont think that Tyrannus (if it was really a polar bear), would had crossed paths with the cave bears.
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Post by brobear on Oct 31, 2019 17:22:21 GMT -5
But the problem is, that i dont think that Tyrannus (if it was really a polar bear), would had crossed paths with the cave bears. This is true King Kodiak.
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Post by brobear on Nov 14, 2019 9:50:52 GMT -5
The Bear Almanac - Second Edition:
The early polar bear. Very few fossil remains of polar bears have been found, but it is known that ancestors of present-day polar bear moved into the arctic during the Pleistocene Epoch. Koch explains, "... it is accepted that during the age of glaciers, perhaps during the mid-Pleistocene, a sizable group of brown bears was isolated from the main population. During this isolation, strong selection pressures forced them to change their style of life." Tyrannus was markedly larger and more "arctos-like" than present-day polar bear.
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Post by brobear on Dec 30, 2019 6:08:49 GMT -5
shaggygod.proboards.com/thread/956/simus-yuk-angustidens-tyrannus Follow up on Ursus maritimus tyrannus (B.M. 24361 Kew Bridge specimen): B.M. No. 24361 is a bear ulna of gigantic proportions. The specimen is well preserved, but the distal epiphyse is missing, so that the bone evidently belonged to a subadult animal. There is also slight damage to the distal end of the diaphyse, the olecranon, and the coronoid process, but the essential characters are well preserved. The fragment has a total length of about 440 mm. as preserved. In a very large subadult recent Polar Bear (U.Z.I. No. 3), the length without distal epiphyse is 387 mm., and the total length 428 mm. Thus the full length of the fossil bone may be estimated at a minimum of 485 mm. As far as I know this is the longest ursine ulna on record. The large Pleistocene tremarctines (Arctodus) of the Americas were unusually long-legged bears, and in some cases their limb bones attain similar or greater dimensions. The maximum record from Potter Creek Cave in northern California is 446 mm. (U.C. No. 3426), and from Rancho La Brea, Los Angeles, 475 mm. (L.A.C.M. No. Z32); and a tremendous specimen from the Irvingtonian, or Californian Middle Pleistocene, attains the almost incredible length of 591 mm (Kurten, 1964). *Repeat: Thus the full length of the fossil bone ( tyrannus ulna ) may be estimated at a minimum of 485 mm.
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Post by brobear on Jan 1, 2020 6:11:10 GMT -5
Looking at the topic: Amur Brown Bear - reply #35 - the Ussuri brown bear ( U.a. lasiotus ) and the Hokkaido brown bear sometimes classified as ( U.a. yesoensis ) are most commonly considered as the same subspecies. I can therefore see no apparent reason why U.m. tyrannus should not fall under the classification of: U.a. priscus - the Pleistocene European brown bear ( Steppe bear ). *Note: I believe that in time we will see this change.
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Post by brobear on Jan 1, 2020 6:16:27 GMT -5
BY serchio25 - ursus tyrannus This artist ( great artwork by the way ) probably created this early, before the initially given size was reduced. We can subtract about 1 ton. But the picture comparison is probably pretty close to accurate.
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Post by King Kodiak on Jan 1, 2020 9:49:01 GMT -5
Looking at the topic: Amur Brown Bear - reply #35 - the Ussuri brown bear ( U.a. lasiotus ) and the Hokkaido brown bear sometimes classified as ( U.a. yesoensis ) are most commonly considered as the same subspecies. I can therefore see no apparent reason why U.m. tyrannus should not fall under the classification of: U.a. priscus - the Pleistocene European brown bear ( Steppe bear ). *Note: I believe that in time we will see this change. Not yet brobear. We really dont even known if its a polar bear, it is still a possibility that its a large subspecies of polar bear, Although we know from more recent reports that its most likely a large subspecies of Priscus.
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Post by OldGreenGrolar on Jan 1, 2020 19:02:52 GMT -5
BY serchio25 - ursus tyrannus This artist ( great artwork by the way ) probably created this early, before the initially given size was reduced. We can subtract about 1 ton. But the picture comparison is probably pretty close to accurate. That bear is estimated to be heavier than a black rhino .
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Post by brobear on Jan 1, 2020 19:19:26 GMT -5
Quote: That bear is estimated to be heavier than a black rhino. 4,215 pounds ( 2+ tons ) was an early estimation of this bear's weight. 2,500 pounds is now a more acceptable weight estimation. Personally, I believe these bears are Ursus arctos priscus, the Pleistocene European brown bear or a population separated from them long enough to be classified separately as Ursus arctos tyrannus. One way or another, I feel certain that at some point, this bear will be renamed.
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Post by brobear on Jan 2, 2020 8:20:42 GMT -5
wiseaboutbears.org/bears-of-yesterday-prehistoric/?fbclid=IwAR3X8Vc5uEF65iD71v7VXtJvPjZo4tqF6fc4ddsThpl3XuRF-tRAblS86L0 Giant bears once dominated the mega-fauna. Ursus spelaeus – the giant cave bear – roughly 1000 pounds. Arctodus simus – the giant short-faced bear – roughly 2000 pounds. *Agriotherium africanum – primitive short-faced bear – roughly 1400 pounds. Arctotherium angustodens – South American short-faced bear – roughly 3000 pounds. Ursus maritimus tyrannus – giant brown bear – roughly 2500 pounds. Stephen Wroe through the use of finite element analysis concludes that *Agriotherium africanum had the strongest bite of any known terrestrial animal. credit – BBC Nature UK *Note: Finally - quote: Ursus maritimus tyrannus – giant brown bear. / now to change that wrong name.
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