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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,340 Views)
CyborgIguana
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I think there were large plesiosaurs in that area of the Atlantic, but AFAIK Elasmosaurus was exclusive to the Western Interior Seaway region.
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TheToastinator
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A piece of toast and a terminator.

Did Elasmosaurus coexist with Archelon?
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CyborgIguana
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Archelon: 80.5 mya
Elasmosaurus: 80.5 mya

So that's a yes.
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BossMan, Jake
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Son of God

So towards the very end of the Cretaceous we had Mosasaurus swimming throughout N. America but many prior species like Platecarpus, Xiphactinus, and Elasmosaurus to name a few had gone extinct AFAIK. What species replaced them that we know of?

Also does anybody else find this restoration to big? It's of M. Hoffmannii
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Edited by BossMan, Jake, Nov 18 2015, 12:32 AM.
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Incinerox
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Āeksiot Zaldrīzoti

I confirm that it is too large with straightened vertebrae, the Mosasaurus in that image comes out at just over 20m, rather than the cited 17-18m for the largest Mosasaurus specimen we have (the species seems to average at about 12-15m like the others).

That being said, it threw me off at first because it turns out they used Tylosaurus as a substitute for Mosasaurus in that size reference, and the two are VERY differently proportioned (Mosasaurus was 1.5 times heavier than a Tylosaurus of the same length).

My past research (likely outdated and I will probably have to re-research the subject) tells me that Mosasaurus had a ridiculously large head in proportion to its body length for mosasaur standards (something the Tylosaurus used doesn't have).

Tl;dr - Yes it's a little bit oversized, but it's not accurately proportioned for a Mosasaurus.
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heliosphoros
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BossMan, Jake
Nov 18 2015, 12:26 AM
So towards the very end of the Cretaceous we had Mosasaurus swimming throughout N. America but many prior species like Platecarpus, Xiphactinus, and Elasmosaurus to name a few had gone extinct AFAIK. What species replaced them that we know of?

For elasmosaurus there are several eslamosaurids in the region like Albertonectes and Fresnosaurus, until the very end of the Cretaceous. For the others I assume there are other ichthyodectids and platecarpines.
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Brach™
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hi

BossMan, Jake
Nov 17 2015, 07:43 PM
Speaking of animals in the Cretaceous seas. Did elasmosaurus or any large plesiosaur live around the European islands around 80 mya?
Closest Elasmosaurid I can find from around that time/place is Zarafasaura from Morrocco but it's from the Maastrichian.
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Posted Image Guat
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How was the general environment of late Permian formations of the Karoo Supergroup?
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Fluffs
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Pull my finger!

Could perhaps some species of dinosaurs could've actually been subspecies of 1 species?
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Jules
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Mihi est imperare orbi universo

It's already extremely hard to define species based on fossils, which is why so many genera are monospecific. Defining subspecies based on fossils is nigh on impossible, since today, subspecies are generally based on criteria such as a tiny difference in size or colouring, things which we can't know based on fossils alone, since most animal subspecies look almost identical on a skeletal level.
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Incinerox
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Āeksiot Zaldrīzoti

Humuhumu
Nov 19 2015, 10:46 PM
How was the general environment of late Permian formations of the Karoo Supergroup?
According to this abstract, seems it wasn't too bad compared to many other parts of the world that were just completely desert.

http://www.sciencedirect.com/science/article/pii/089953629090053H

There's lots of rivers and lakes and (possibly) seasonal monsoons.

I'm finding rather little on the sort of paleoflora there or anything specific for the climate but it seems to have been mild or consistent enough to provide a relatively safe haven for diversity in a time where over 90% of everything on the planet started dropping like flies.
Edited by Incinerox, Nov 20 2015, 04:52 AM.
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Acinonyx Jubatus
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I AM THE UNSHRINKWRAPPER!

Does anyone have an up-to-date diagram of Ankylosaurus' armor? I can't find one anywhere.
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Brach™
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hi

Acinonyx Jubatus
Nov 20 2015, 02:41 PM
Does anyone have an up-to-date diagram of Ankylosaurus' armor? I can't find one anywhere.
Best one I can find. Probably better ones out there though.
http://img00.deviantart.net/2cb8/i/2009/093/0/0/cretaceous_tank_by_troodon88.jpg
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Paleop
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Paleopterix

has a paper on the new utahraptor proportions been released?
thanks :D
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Jules
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Mihi est imperare orbi universo

Paleop
Nov 25 2015, 12:21 AM
has a paper on the new utahraptor proportions been released?
thanks :D
I haven't laughed that much in years.
That thing has risen to an almost legendary status in the palaeontological community; it's probably lost inside an intergalactic black hole or stolen by aliens by now, if it's even still in our universe xD
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