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Extinct Animal Questions
Topic Started: Nov 26 2013, 10:24 PM (193,445 Views)
Yi Qi
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Mammals were NEVER reptiles, their common ancestor with reptiles are as far back as primitive amniotes , synapsids were very different and evolved from a COMPLETELY different lineage.

Edited by Yi Qi, Nov 13 2014, 06:57 PM.
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Jules
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Mihi est imperare orbi universo

Austroraptor
Nov 13 2014, 05:46 PM
Mammals were NEVER reptiles, their common ancestor with reptiles are as far back as primitive amniotes ("amphibians"), synapsids were very different and evolved from a COMPLETELY different lineage.

As far as I know synapsids were considered reptiles?
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Yi Qi
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Crooky
Nov 13 2014, 06:21 PM
Austroraptor
Nov 13 2014, 05:46 PM
Mammals were NEVER reptiles, their common ancestor with reptiles are as far back as primitive amniotes ("amphibians"), synapsids were very different and evolved from a COMPLETELY different lineage.

As far as I know synapsids were considered reptiles?
Maybe in the early 1920-30s, but we have a fairly good knowledge of these creatures and we know they split out from the main tetrapod line FAR before "reptiles"

"Reptiles" and "birds" are horrible nonexisting terms anyway, the correct term would be Sauropsid

see, the closest relatives between the "mammals" (Synapsida) and "reptiles" (Sauropsida) are basal amniotes

http://en.wikipedia.org/wiki/Amniote
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Luca9108
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Master of Dinosaurs

Question: Are these dinosaurs separate species?

Torosaurus
Nanotyrannus
Dracorex
Stygimoloch
Anatotitan

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Yi Qi
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Luca9108
Nov 14 2014, 04:27 PM
Question: Are these dinosaurs separate species?

Torosaurus
Nanotyrannus
Dracorex
Stygimoloch
Anatotitan

Annatotitan annectens is now Edmontosaurus annectens, tough its still a separate species from E.regalis

The pachycephalosaurs we don't know but they are probably different species, and there's substantial evidence of that according to Robert T. Bakker, tough we will only know the details once he shows us his juvenile pachycephalosaurus specimen

Nannotyrannus we don't know

Torosaurus is not triceratops, we have enough data to conclude they're different animals.
Edited by Yi Qi, Nov 15 2014, 11:05 AM.
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Luca9108
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Master of Dinosaurs

Austroraptor
Nov 14 2014, 04:48 PM
Luca9108
Nov 14 2014, 04:27 PM
Question: Are these dinosaurs separate species?

Torosaurus
Nanotyrannus
Dracorex
Stygimoloch
Anatotitan

Annatotitan annectens is now Edmontosaurus annectens, tough its still a separate species from E.regalis

The pachycephalosaurs we don't know but they are probably different species, and there's substantial evidence of that according to Robert T. Bakker, tough we will only know the details once he shows us his juvenile pachycephalosaurus specimen

Nannotyrannus we don't kniw

Torosaurus is not triceratops, we have enough data to conclude they're different animals.
Thanks for answer. ( I heard that Nanotyrannus was a juveline Tyrannosaurus but I am not sure. )
Edited by Luca9108, Nov 14 2014, 04:57 PM.
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stargatedalek
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I'm not slow! That's just my moe!

Luca9108
Nov 14 2014, 04:27 PM
Question: Are these dinosaurs separate species?

Torosaurus
Nanotyrannus
Dracorex
Stygimoloch
Anatotitan

Austroraptor did a great job, but since a few of these are still somewhat subjective, I'd like to give my opinions also

-torosaurus was covered, but to go into more detail the theory was debunked when fossils of juvenile torosaurus were found
-nanotyrannus is almost certainly not tyrannosaurus, the fossils are inconsistent with the fossils of juvenile tyrannosaurus, it is possible, but the "common theory" is that it was separate
-dracorex and stygimoloch are most likely not synonymous with pachycephalosaurus, however they are likely synonymous with each other
-anatotitan was covered
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Swimming Spaghetti Monster
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What integument were the plesiosaurs covered in?
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Yi Qi
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Swimming Spaghetti Monster
Nov 15 2014, 08:05 AM
What integument were the plesiosaurs covered in?
Most likely small, overlapping scales, as with other marine reptiles

Edited by Yi Qi, Nov 15 2014, 11:16 AM.
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Swimming Spaghetti Monster
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Is there a possibility that ammonites were like cuttlefish, with shells covered in soft tissues?
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CyborgIguana
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Unlikely IMO given the fact that the shells of most genera are more similar to those of nautiloids, but not impossible I suppose.
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CyborgIguana
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Sorry about the double post, but would it be better to give Masiakasaurus scales or feathers?
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Incinerox
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Āeksiot Zaldrīzoti

Scales. The closest we have to noasaur integument comes from abelisaur skin (Carnotaurus is known from a near complete skin cast showing mosaic scales and rows of osteoderms) and Ceratosaurus dorsal scutes.
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CyborgIguana
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Thanks for the answer. ;)
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Yi Qi
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What DG said, the fact that everybody keeps giving them feathers for some bizarre reason annoys me to the highest degree, when we know these creatures were abelisaurs and likely to have not only scales, but also rows of osteoderms.

the same goes for limusaurus and elaphrosaurus.
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