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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,377 Views)
54godamora
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thank you humu
( i would use your full username,but its rather long sorry.)
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Incinerox
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SpookDoc
Aug 3 2015, 06:40 PM
Have there been any proven examples of sexual dimorphism in ancient reptiles, like pterosaurs or ceratopsians?
Recently Hesperosaurus too.

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0123503
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BossMan, Jake
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Son of God

IIRC the only suchomimus skeleton discovered was a juvenile, if that holds true than how big would an adult have been?
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Incinerox
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Potentially 11-12m.
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Zoo Tycooner FR
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#Lithopédion

Yes , i agree because he's biggest than the Baryonyx , so 11 - 12 or even 13 meters . ;)
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Posted Image Flish
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Incinerox
Aug 4 2015, 03:53 AM
SpookDoc
Aug 3 2015, 06:40 PM
Have there been any proven examples of sexual dimorphism in ancient reptiles, like pterosaurs or ceratopsians?
Recently Hesperosaurus too.

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0123503
THANK YOU I am so tired of people insisting it's Stegosaurus that we know sexual dimorphism because the article misleadingly refers to it as a species of Stegosaurus for whatever reason.
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Incinerox
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Because Hesperosaurus is sister taxon to Stegosaurus anyway so it really doesn't make much difference.
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Zoo Tycooner FR
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#Lithopédion

This is true but some paleontologists don't agree with that , so i will not enter in a debate because i'm not Palaelontolgist but i will just put some Sources :

Carpenter had originally concluded that Hesperosaurus was a rather basal stegosaur. However, Susannah Maidment and colleagues in 2008 published a more extensive phylogenetic study in which it was recovered as a derived form, closely related to Stegosaurus and Wuerhosaurus. They proposed that Hesperosaurus should be considered a species of Stegosaurus, with Hesperosaurus mjosi becoming Stegosaurus mjosi; at the same time Wuerhosaurus was renamed into a Stegosaurus homheni. This has proven to be controversial. In biology the concept "genus" is not operationalised, i.e. generally no operational definition is given indicating in which way it could be empirically established whether a certain species belongs to a certain genus. Carpenter, considering the problem more of a philosophical than a scientific nature, in 2010 rejected the synonymy of Hesperosaurus with Stegosaurus stating that in his opinion Hesperosaurus was sufficiently different from Stegosaurus to be named a separate genus. Christiansen e.a. in 2010 judged likewise.^

Source
Edited by Zoo Tycooner FR, Aug 4 2015, 08:14 PM.
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Incinerox
Aug 4 2015, 06:38 PM
Because Hesperosaurus is sister taxon to Stegosaurus anyway so it really doesn't make much difference.
Well no, but it does cause confusion for people who don't understand that Stegosaurus armatus/ungulatus/sulcatus/stenops are not known to have sexual dimorphism and it is only Hesperosaurus.
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Zoo Tycooner FR
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#Lithopédion

Yes , i confirm Hesperosaurus had Sexual Dimorphism , not sure for all of the Stegosaurus Species thought ...
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BossMan, Jake
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Son of God

Zoo Tycooner FR
Aug 4 2015, 08:27 PM
Yes , i confirm Hesperosaurus had Sexual Dimorphism , not sure for all of the Stegosaurus Species thought ...
Really though I wouldn't be suprised if they did. Not so much plate shape but more on the lines of coloration.
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Zoo Tycooner FR
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#Lithopédion

Yes , But so far only Stegosaurus mjosi is known to have Sexual Dimorphism , going to search for the other ;)
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Incinerox
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Flish
Aug 4 2015, 08:25 PM
Incinerox
Aug 4 2015, 06:38 PM
Because Hesperosaurus is sister taxon to Stegosaurus anyway so it really doesn't make much difference.
Well no, but it does cause confusion for people who don't understand that Stegosaurus armatus/ungulatus/sulcatus/stenops are not known to have sexual dimorphism and it is only Hesperosaurus.
The only reason why they aren't known to have it is because Stegosaurus/Hesperosaurus mjosi was the only one we have preserved individuals of multiple sizes and both sexes in context with each other. S. armatus and S. stenops are known from 30-50 fragmentary specimens each, but without any of them in context with other individuals, or at least with the right parts of the skeleton to compare differences, it's difficult to confirm sexes.
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Urufu
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how long are the Horns on the Neck frill, the Legs, the tail, the Neck frill and the protofeathers of Styracosaurus Albertensis?
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Incinerox
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Urufu
Aug 6 2015, 09:49 AM
how long are the Horns on the Neck frill, the Legs, the tail, the Neck frill and the protofeathers of Styracosaurus Albertensis?
There results are only approximations based on crude measurements. Also, assume the specimen is 5.5m long.

Horns:
Nose horn: 57cm
Longest frill spikes: 55-57cm

Limbs (assume completely straight, which they wouldn't have been in life):
Front legs: 1.24m
Hind legs: 1.84m

Tail: 2.07m

Frill:
With spikes: 1.30m
Without spikes: 73cm

Protofeathers: NON EXISTENT
Edited by Incinerox, Aug 6 2015, 02:30 PM.
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