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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,318 Views)
CyborgIguana
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No, all Ornithomimus material from Hell Creek was reclassified as Struthiomimus a while back IIRC.
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Dylan
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How many species of Spinosaurid have been classified?
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CyborgIguana
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Are we talking actual species or genera?
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Dylan
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Actual species
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CyborgIguana
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Thirteen species, according to Wikipedia (albeit two of which are only tentatively assigned to the group and one of those doesn't have a name yet).
Edited by CyborgIguana, Feb 1 2016, 05:52 PM.
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Fluffs
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Pull my finger!

Did Macrauchenia really have a trunk? I'm hearing around that some people are depicting it without one:

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Posted Image

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babehunter1324
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As far as I know it is completelly unknown, the reason why it is usually assumed to have one is because it's nasal openings are placed in a somewhat similar position than the one on tapirs' (it is worth mentioning however that it's skull is still very different from a tapir skull*).

One thing we do know for sure is that those adaptations were absent in more primitive members of the family like Cramauchenia. IMO it's a 50/50 chance that it had some short of trunk maybe a saiga style nose or something entirelly different.

http://www.boneroom.com/uploads/4/8/1/1/48118243/s521972503441136676_p1269_i1_w338.jpeg

Edit: Now that I think about it I doubt it would had been similar in overall morphology to the saiga's nose, it may had a similar function, though.
Edited by babehunter1324, Feb 2 2016, 05:58 AM.
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Incinerox
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Āeksiot Zaldrīzoti

Given that animals with trunks often have a massive process sitting at the top of their nasal openings for muscle support, and Macrauchenia doesn't have one at all, it's actually likely it didn't have a trunk at all.

It's oddly diplodocid-like in its nasal anatomy..
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BossMan, Jake
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Son of God

Which formations outside of North America date from the youngest stages of the Maastrichtian?

And also I just read that Pachyrhinosaurus, Parasaurolophous, and Hypacrosaurus all lived up to the K-T extinction. What was there evidence behind this I thought they all died off prior to 70 mya?
Edited by BossMan, Jake, Feb 2 2016, 10:26 AM.
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babehunter1324
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BossMan, Jake
Feb 2 2016, 10:10 AM
Which formations outside of North America date from the youngest stages of the Maastrichtian?

And also I just read that Pachyrhinosaurus, Parasaurolophous, and Hypacrosaurus all lived up to the K-T extinction. What was there evidence behind this I thought they all died off prior to 70 mya?
There's Hateg Island in Romania, Maevarano/Berivotra Formation in Madagascar (although I'm not sure how well dated they are), the Tremp formation in Spain, the Oulad Abdoun Basin from Morocco and maybe the Lameta formation of India (though I think it might be from the lower Maastritchian).
Edited by babehunter1324, Feb 2 2016, 11:19 AM.
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CyborgIguana
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I know that Pachyrhinosaurus at least was a Maastrichtian animal (it's been found in the younger rocks of the Prince Creek formation dating to about 67 million years ago), but I'm not sure about Hypacrosaurus and Parasaurolophus (AFAIK there's unidentified lambeosaurine material from Hell Creek but it can't be reliably referred to either of these genera).
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Incinerox
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Āeksiot Zaldrīzoti

There's also the La Colonia Formation of Argentina (Carnotaurus's ecosystem), Nianxiong Formation of South China (Qianzhousaurus's ecosystem), Prince Creek Formation of Alaska, Aren Formation also from Spain, Yuliangze Formation of Northeast China (Charonosaurus's ecosystem), Marnes d'Auzas Formation of France, Tsagayan Formation of Russia, Udurchukan Formation also from Russia, Navesink, Tinton, Redbank and New Egypt Formations of New Jersey, Pab and Vitaki Formations of Pakistan, Marnes Rouges Inferieures Formation also of France, Grès à Reptiles Formation again from France, Marilia Formation of Brazil, Oulad Abdoun Basin of Morocco, and potentially rocks in Jordan (Arambourgiania's ecosystem) and Kazakhstan too (undescribed MASSIVE tyrannosaurine bones found there).

And obviously the Maastricht Formation, for which the epoch is named.
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Jony
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We currently have evolution in biology. And sth interesting have attracted my attention on a worksheet. This worksheet was - among other things - about the evolution of proboscidea. And they claim there that the Mastodon survived up to 800 A.D.
I took a little research and didn't really found any evidences. Now I wondered whether you think that this thesis is true or not.
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CyborgIguana
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Incinerox
Feb 2 2016, 02:37 PM
There's also the La Colonia Formation of Argentina (Carnotaurus's ecosystem), Nianxiong Formation of South China (Qianzhousaurus's ecosystem), Prince Creek Formation of Alaska, Aren Formation also from Spain, Yuliangze Formation of Northeast China (Charonosaurus's ecosystem), Marnes d'Auzas Formation of France, Tsagayan Formation of Russia, Udurchukan Formation also from Russia, Navesink, Tinton, Redbank and New Egypt Formations of New Jersey, Pab and Vitaki Formations of Pakistan, Marnes Rouges Inferieures Formation also of France, Grès à Reptiles Formation again from France, Marilia Formation of Brazil, Oulad Abdoun Basin of Morocco, and potentially rocks in Jordan (Arambourgiania's ecosystem) and Kazakhstan too (undescribed MASSIVE tyrannosaurine bones found there).

And obviously the Maastricht Formation, for which the epoch is named.
Of course not all of those environments are from the VERY youngest stages of the Maastrichtian (while the La Colonia and Prince Creek formations come close, their deposits still end a million years or two short of the K-T boundary IIRC).
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BossMan, Jake
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Son of God

Prince Creek actually dates to as recent as 60 mya IIRC
La Colonia is very close coming at only 68 mya
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