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Post by brobear on Nov 4, 2018 16:21:07 GMT -5
A genus can have many species, and its above species. The question is, are these 2 short faced bears the same species, but different subspecies? They are the same subfamily as you can see. Arctodus simus is a species, Arctotherium angustidens is a species, and Ursus arctos is a species.
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Post by King Kodiak on Nov 4, 2018 16:39:26 GMT -5
A genus can have many species, and its above species. The question is, are these 2 short faced bears the same species, but different subspecies? They are the same subfamily as you can see. Arctodus simus is a species, Arctotherium angustidens is a species, and Ursus arctos is a species. Right, same subfamily (Tremarctinae) but different species. Ill tell you, reading all the prehistoric bear threads, and the pleistocene thread, i have learned alot about these prehistoric bears.
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Post by brobear on Mar 7, 2019 1:55:04 GMT -5
shaggygod.proboards.com/ With the recent short-faced bear fossil discovery in Tennessee (Gray Fossil Site), I thought some of the forum audience might be interested to know that there have been additional-similar fossil discoveries made in the western United States. We are still talking about the Tremarctine branch and Plionarctos lineage but earlier disovery. The following article reference is from 2001: ABSTRACT—The Pliocene Ringold Formation of eastern Washington has yielded important new materials of tremarctine bears of the anagenetic Plionarctos lineage. The genus is reviewed in light of this new material and observations made on other described specimens. One of these was previously described from the medial Hemphillian Rattlesnake Formation of Oregon and is recognized as a tremarctine bear, thus extending the earliest record of the group into the early part of the late Miocene. The late Hemphillian P. edensis, the genotypic species, is rediagnosed, although no new material is added to its hypodym. A new species from the early Blancan White Bluffs sites, P. harroldorum, appears to have been derived from P. edensis. Referred Plionarctos sp. from the medial Blancan Taunton Locality has some dental features that are more derived and approach those of the Pleistocene Tremarctos floridanus. Plionarctos forms a paraphyletic stem-group for the Tremarctinae. Species of this genus can be traced successively into the Pliocene where they form the stock from which the Pleistocene and Recent species of Tremarctos, Arctodus, and Pararctotherium arose. Tedford, R. H. & Martin, J. Plionarctos, a tremarctine bear (Ursidae; Carnivora) from western North America. J. Vert. Paleontol. 21, 311–321 (2001). www.bioone.org/doi/abs/10.1671/0272-4634%282001%29021%5B0311:PATBUC%5D2.0.CO%3B2
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Post by brobear on Mar 7, 2019 17:49:40 GMT -5
shaggygod.proboards.com/board/10/americas With the recent short-faced bear fossil discovery in Tennessee (Gray Fossil Site), I thought some of the forum audience might be interested to know that there have been additional-similar fossil discoveries made in the western United States. We are still talking about the Tremarctine branch and Plionarctos lineage but earlier disovery. The following article reference is from 2001: ABSTRACT—The Pliocene Ringold Formation of eastern Washington has yielded important new materials of tremarctine bears of the anagenetic Plionarctos lineage. The genus is reviewed in light of this new material and observations made on other described specimens. One of these was previously described from the medial Hemphillian Rattlesnake Formation of Oregon and is recognized as a tremarctine bear, thus extending the earliest record of the group into the early part of the late Miocene. The late Hemphillian P. edensis, the genotypic species, is rediagnosed, although no new material is added to its hypodym. A new species from the early Blancan White Bluffs sites, P. harroldorum, appears to have been derived from P. edensis. Referred Plionarctos sp. from the medial Blancan Taunton Locality has some dental features that are more derived and approach those of the Pleistocene Tremarctos floridanus. Plionarctos forms a paraphyletic stem-group for the Tremarctinae. Species of this genus can be traced successively into the Pliocene where they form the stock from which the Pleistocene and Recent species of Tremarctos, Arctodus, and Pararctotherium arose. Tedford, R. H. & Martin, J. Plionarctos, a tremarctine bear (Ursidae; Carnivora) from western North America. J. Vert. Paleontol. 21, 311–321 (2001). www.bioone.org/doi/abs/10.1671/0272-4634%282001%29021%5B0311:PATBUC%5D2.0.CO%3B2
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Post by Deleted on Apr 3, 2019 9:05:22 GMT -5
anyone has a picture of this bear?
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Post by King Kodiak on Apr 3, 2019 16:59:50 GMT -5
anyone has a picture of this bear? Tremarctinae is a subfamily of Ursidae. Short faced bears, Florida Spectacled bear, Arctodus Simus, and the only extant bear, the Spectacled bear, all are part of the Tremarctinae subfamily.
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Post by Deleted on Apr 3, 2019 20:20:58 GMT -5
anyone has a picture of this bear? Tremarctinae is a subfamily of Ursidae. Short faced bears, Florida Spectacled bear, Arctodus Simus, and the only extant bear, the Spectacled bear, all are part of the Tremarctinae subfamily.
Thanks for the clarity there. The spectacled bear despite is herbivorous diet is predatory enough to kill a tapir. I wish the other tremartinae bears were alive today.
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Post by King Kodiak on Apr 4, 2019 5:29:17 GMT -5
Tremarctinae is a subfamily of Ursidae. Short faced bears, Florida Spectacled bear, Arctodus Simus, and the only extant bear, the Spectacled bear, all are part of the Tremarctinae subfamily.
Thanks for the clarity there. The spectacled bear despite is herbivorous diet is predatory enough to kill a tapir. I wish the other tremartinae bears were alive today. I wish also.
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Post by brobear on Jan 6, 2020 3:07:09 GMT -5
en.wikipedia.org/wiki/Tremarctinae Traditionally the phylogenetic inner relationships of tremarctines had Plionarctos and Tremarctos being basal groups with respect to a short-faced bear clade of Arctodus and Arctotherium. A study of the affinities of bears belonging to Arctotherium indicates that they were more closely related to the spectacled bear than to Arctodus, implying convergent evolution of large size in the two lineages. Taxonomy The following taxonomy of the tremarctine bears follow by Mitchell et al. (2016): Subfamily Tremarctinae (Merriam & Stock, 1925) †Plionarctos (Frick, 1926) †Plionarctos harroldorum (Tedfored & Martin, 2001) †Plionarctos edensis (Frick, 1926) †Arctodus (Leidy, 1854) †Arctodus simus (Cope, 1879) †Arctodus pristinus (Leidy, 1854) †Arctotherium (Burmeister, 1879) †Arctotherium angustidens (Gervais & Ameghino, 1880) †Arctotherium vetustum (Ameghino, 1885) †Arctotherium wingei (Ameghino, 1902) †Arctotherium bonariense (Gervais, 1852) †Arctotherium tarijense (Ameghino, 1902) Tremarctos (Gervais, 1855) †Tremarctos floridanus (Gildey, 1928) Tremarctos ornatus (Cuvier, 1825) – spectacled bear
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Post by brobear on Apr 24, 2020 3:32:53 GMT -5
A quote from the first post of - Earliest Bear Ancestors - Basic Bear Evolution: *Quote: Of the 5 species of Arctodus, A. pristinus,and A. simus were in North America and A. bonariensis, A. pamparus, and A. brasiliensis were found in South America. Relatively little is known of Arctodus in South America because few fossils have been found. A. brasiliensis was the smallest of the 3 species and, as it more closely resembled the North American species, may have been an intermediate. A. pamparus was also relatively small, whereas A. bonariensis was very large, rivaling A. simus in size (Kurten 1967). A. bonariensis had large canines and carnassials but short posterior molars, suggesting a carnivorous diet. Based on the structure of their molars, Kurten (1967) suggested the possibility of a mollusk-eating specialization for the other South American species.
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