Tyrant polar bear

[Gorilla king]

Ursus maritimus tyrannus


Ursus maritimus tyrannus (meaning tyrant polar bear) is an extinct subspecies of polar bear, known from a single fragmentary ulna found in the gravels of the Thames at Kew Bridge, London. It was named by the Finnish paleontologist Björn Kurtén in 1964 and is interpreted to represent a relatively large subadult individual: the ulna is estimated to have been 48.5 cm (19 in) long when complete,[1] for comparison, modern subadult polar bear ulnae are 36–43 cm (14–17 in) long.[1]




An unpublished reinvestigation of the fossil suggests that the fossil is actually a brown bear.[2]


en.m.wikipedia.org/wiki/Ursus_maritimus_tyrannus

[Gorilla king]

Ursus maritimus tyrannus

Ursus maritimus tyrannus (Ursus maritimus tyrannus  Kurtén, 1964)

?Ursus arctos priscus

 Order: Carnivora

Family: Ursidae

Size: 3,5 m in length, 145 cm in height, 350 - 1000 kg of weight

Time period: the Late Pleistocene of Northern Eurasia (70,000 years ago)

Typical representative: Ursus maritimus tyrannus  Kurtén, 1964

 
Ursus maritimus tyrannus is an extinct subspecies of polar bear, known from a single fragmentary ulna found in the gravels of the Thames at Kew Bridge, London. It was named by the Finnish paleontologist Björn Kurtén in 1964 and is interpreted to represent a relatively large subadult individual: the ulna is estimated to have been 48.5 cm  long when complete, recent studies only weigh it at 400 kg, for comparison modern subadult polar bear ulnae are 36–43 cm  long. Dating back to the Late Pleistocene, approximately 70,000 years ago, it is the oldest fossil assigned to the polar bear; however, an unpublished reinvestigation of the fossil suggests that the fossil is actually a brown bear.

Commonly used names include: Pleistocene polar bear or Tyrant polar bear.


prehistoric-fauna.com/Ursus-maritimus-tyrannus

[Gorilla king]

Most likely a brown bear according to an unpublished reinvestigation of the fossil. However, nothing new has come up and its still officially a Pleistocene polar bear (Ursus maritimus tyrannus).

[oldindigosilverback]

Some think the tyrant polar bear does not exist and call it a 400 kg brown bear but who knows. If it does exist it would be a brown version of the polar bear. A giant ABC brown bear?

[Gorilla king]

Aug 23, 2021 7:24:58 GMT -5 oldindigosilverback said:

Some think the tyrant polar bear does not exist and call it a 400 kg brown bear but who knows. If it does exist it would be a brown version of the polar bear. A giant ABC brown bear?

Yeah, everything is possible. It might had even been the same as the Pleistocene Steppe brown bear (Ursus arctos priscus). Hope we get new info soon.

[oldindigosilverback]

How the tyrant polar bear is assumed to be like but I believe it looks more like a browny.

[oldindigosilverback]

CHARACTERISTICS
Tyrannus was markedly larger and more Arctos-like than the present polar bear. Their bone structure was similar to that of brown bears only much larger. They measured about 6 feet at the shoulder, over 12 feet in length, and weighed on average over 2,500 pounds making it the largest carnivorous land mammal ever.

www.bearsoftheworld.net/early_polar_bears.asp

This shows that the 12 foot tall male polar bear is only an exaggeration since the tyranus can reach 12 ft in length. The tyrant polar bear is also confirmed to look more like a brown bear as it is more Artos like.

[brobear]

www.polarresearch.net/index.php/polar/article/viewFile/6131/6810

The Kew Bridge find is special in
that it is an ulna of a very large animal, considerably
larger than present-day polar bears. Kurtén (1964)
assigned it to a polar bear subspecies, Ursus maritimus
tyrannus. The Kew Bridge specimen has recently been
reinvestigated by scientists at London’s Natural History
Museum, and they are now confident that the Kew
animal was a type of brown bear, U. arctos (Andy Currant,
pers. comm. 2008).

*Note; Ursus ? tyrannus was probably a brown bear but still not sure.

[oldindigosilverback]

/\ Modern day research often is used to refute old accounts but it does not always mean all old accounts are false. Though in this case most posters believe this bear is actually a brown bear. Neither seems to be wrong as polar bears once came from brown bears and will probably return to brown bears if they meet more than they do right now.

[arctozilla]

From what it seems. The tyrant polar bear was most likely a brown bear.

[oldindigosilverback]

Apr 14, 2023 7:44:48 GMT -5 arctozilla said:

From what it seems. The tyrant polar bear was most likely a brown bear.

And more adaptable to climate change too. Brown bears being the most widespread bear is what made the polar bear exist.

[oldindigosilverback]

This bear is not the only one that seems to be downsized.

[oldindigosilverback]

If this bear really was a 400kg brown bear, it might be the same brown bear from Ireland which is said to be the polar bear's ancestor.