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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,325 Views)
BossMan, Jake
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Son of God

What were some cretaceous dinosaurs outside of North America that would have lived at latitudes similar to say The Horseshoe Canyon and Dino Park formations?
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Incinerox
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Āeksiot Zaldrīzoti

Are we talking latitudes NOW or latitudes back then? And are we talking the same TIME as Horseshoe Canyon and Dinosaur Park (bout 74Ma-ish, give or take)?

Assuming today, with absolute freedom with when in the Cretaceous, there's quite a lot. The Wealden Group, Yixian, Nemegt and Djadochta fall in that latitude now.

Of course, Yixian and Wealden are Early Cretaceous, but Nemegt and Djadochta, while about 70 million years old and roughly equate to Horseshoe Canyon's time, North Asia was turned northwards, putting North China and Mongolia a LOT further north than they are now. Kamchatka and the Bering Land Bridge itself was WELL within the Arctic circle at the time.
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BossMan, Jake
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Son of God

A few questions about Terror Birds

What kinds Terror Birds that coexisted with Smilodon in South America?

How far North have we found Terror Birds and could they have survived farther north?

and could they have crossed paths with people?
Edited by BossMan, Jake, Jan 12 2016, 12:04 PM.
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babehunter1324
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Phorusrhacidae may had been completelly extinct by the time Smilodon colonized South America, some fossils from the Pleistocene in South America had been assigned to Phorusracids but the ones that had been found so very small animals (probably no larger than Llallawavis). Titanis likelly overlapped for sometime with Megantereon and early Smilodon morphs.

Not sure about how far North Titanis got, I know it's remains had been found mostly in Florida and Texas and it's extinction seems to have happened at the start of the first glaciar periods early in the Pleistocene.
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Incinerox
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Āeksiot Zaldrīzoti

It's only known from Florida and Texas as far as I'm aware.
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Posted Image Flish
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Are there any good skeletals for Shasatasaurus sikanniensis? All I'm finding are ones by David Peters, and while his Ichthyosaurs aren't as hideous as most of his stuff, I'm not going to risk it.
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Paleodude
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ex-Krampus

Flish
Jan 13 2016, 04:01 PM
Are there any good skeletals for Shasatasaurus sikanniensis? All I'm finding are ones by David Peters, and while his Ichthyosaurs aren't as hideous as most of his stuff, I'm not going to risk it.
http://mygeologypage.ucdavis.edu/cowen/historyoflife/Shastasaurus.jpg

Hopefully this works for you :)
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Posted Image Flish
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That is a Shonisaurus by the looks of it, which I am good on a skeletal for.
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BossMan, Jake
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Son of God

They were more eel like with a shorter skull. You could go off a Shonisaurus skeleton and tweak it from there. This ain't a skeletal but it may help.
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Incinerox
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Āeksiot Zaldrīzoti

The problem is that almost no one restores Shoniosaurus or Shastasaurus skeletons with a natural spine curvature.
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TheNotFakeDK
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200% Authentic

Scott Hartman published a skeletal of Shonisaurus popularis just the other day if that's of any use.

Incinerox
Jan 10 2016, 10:33 PM
Again, we have zero indication on whether Hatzegopteryx was long-necked or short necked. We have both forms in smaller azhdarchids in the area though - Long necked Euazhdarcho with a 3m wingspan, and a short necked, described but unnamed species estimated to have a 4m wingspan. There has so far been no direct connection between Hatzegopteryx and the short necked species at a cladistic level - only references to pterosaur diversity.
I'm fairly sure the claims for short-necked Hatzegopteryx are based on a large azhdarchid cervical vertebrae, EME 315, that's (as far as I'm aware anyway) only been described in an abstract of the 2013 SVPCA:

"We present evidence of unprecedented morphological diversity in giant azhdarchids with EME 315, a large and robust seventh cervical vertebra from the Maastrichtian Sebeş Formation of Transylvania. The specimen corresponds in size, histology and proportions with the 10 m wingspan Transylvanian azhdarchid, Hatzegopteryx thambema, and likely represents a member of this genus or an extremely close relative. Despite its size, EME 315 is proportionally short and likely represents a cervical III-VII length of only 1.39 m. This is comparable to the neck lengths of much smaller azhdarchids and considerably shorter than our estimated cervical III-VII length for Arambourgiania philadelphiae (2.3m), another giant azhdarchid known from cervical remains."

The full abstract's on page 45 of the 2013 SVPCA program, "Pterosaur overlords of Transylvania: short-necked giant azhdarchids in Late Cretaceous Romania"

http://svpca.org/years/2013_edinburgh/abstracts.pdf
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Incinerox
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Āeksiot Zaldrīzoti

Oh wow, that's a thing?

Must. READ.

EDIT: I got so hyped up that I didn't pay attention to the fact it's only an abstract. -.-
Edited by Incinerox, Jan 14 2016, 03:16 PM.
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TheNotFakeDK
Jan 14 2016, 02:43 PM
yup, saw it. :) I intended to use it but wanted to check to see if there were any good Shastasaurus skeletals.
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Fluffs
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Pull my finger!

Which species exactly was the ancestor of the horse? I read that the Przewalski's horse isn't, and that only the tarpan had some influences. I'm to be honest, confused, so could someone please enlighten more on the domestication of the horse?
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CyborgIguana
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Just did some reading, and apparently the tarpan is indeed our best guess as to the ancestor of the domestic horse (though I get the impression that we're not 100% sure).
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