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The Tyreophoran Thread- Stegosaurs and ankylosaurs
Adam Khor
Stegosaurs were seemingly not extinct in Spain during the early Cretaceous as suggested by fossil tracks:
http://www.bioone.org/doi/abs/10.5252/g2012n2a4
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Comments
Galvasean
Deltapodus brodricki
? better not be named after this guy...
Rubecula
The mention of Deltapodus brodericki (brodricki ... either is acceptable apparently) made me dig this out for your delight:
PS it only mentions Deltapodus b. really, but is interesting none the less.
http://www.sorbygeology.group.shef.ac.uk/dino.html
Adam Khor
http://www.tandfonline.com/doi/abs/10.1080/03115518.2012.702531
They're from the lower Cretaceous of La Amarga, Argentina, meaning we can finally imagine what other animals lived alongside lonely Amargasaurus
Adam Khor
Oohkotokia
, new ankylosaur
It is very similar to
Ankylosaurus
, really. Oh, and it seems that old classic dino
Scolosaurus
is valid once again.
http://www.app.pan.pl/archive/published/app58/app20120125_acc.pdf
This is
Euoplocephalus
, but still...
Galvasean
Good ol'
Scolosaurus
. My early 80s textbooks are valid again!
Adam Khor
Europelta
, new ankylosaur from Spain
http://m.sltrib.com/sltrib/mobile3/57209899-219/europe-utah-coal-kirkland.html.csp
Galvasean
Such a flat head
Adam Khor
http://www.telegraph.co.uk/science/dinosaurs/11231863/Worlds-most-complete-stegosaurus-unveiled-by-Natural-History-Museum.html
Adam Khor
More about "Sophie"
http://www.dailymail.co.uk/sciencetech/article-2859296/Meet-Sophie-complete-stegosaurus-skeleton-found.html
Rubecula
The Natural History Museum is a great place to visit if you have not yet been there. I can recommend it if you are ever in London.
Manach
Beware the souvenir shop though, can never stop at merely one memento.
Adam Khor
Stegosaurus
bit about as hard as a sheep. But that's ok since the jaws weren t its business end :B
http://www.dailymail.co.uk/sciencetech/article-3600543/The-dinosaur-bite-like-SHEEP-Enormous-five-ton-Stegosaurus-surprisingly-weak-jaw.html
Adam Khor
Pawpawsaurus
' sense of smell
http://phys.org/news/2016-05-early-armored-dino-texas-lacked.html
Adam Khor
Semiaquatic mini-ankylosaur: Is this the first carnivorous ornitischian?
http://www.eartharchives.org/articles/armored-dinosaur-was-a-fish-eating-turtle-mimic/
Should mention that this study has been controversial and there's people out there saying that the fish was actually not in the ankylosaur's gut, but rather near its shoulders. Still, I don t find it impossible to believe.
Adam Khor
This is the best nodosaur fossil ever found!
Actually one of the best dinosaur fossils ever found, period, has been found in Alberta, Canada. This nodosaur (probably a
Sauropelta
) was found in marine deposits, and preserves so much skin and intact armor that paleontologists are having trouble to even see the bones beneath. The spikes even preserve their petrified queratine sheaths.There were also traces of pigments which suggest the animal was reddish, with light-colored spikes. Part of the fossil was lost but the entire animal would've been around 5.5 meters long.
https://www.nationalgeographic.com/magazine/2017/06/dinosaur-nodosaur-fossil-discovery/
EDIT: Despite its many similarities to
Sauropelta
, this specimen has been named
Borealopelta
.
Adam Khor
Actually one of the best dinosaur fossils ever found, period, has been found in Alberta, Canada. This nodosaur (probably a Sauropelta) was found in marine deposits, and preserves so much skin and intact armor that paleontologists are having trouble to even see the bones beneath. The spikes even preserve their petrified queratine sheaths.There were also traces of pigments which suggest the animal was reddish, with light-colored spikes. Part of the fossil was lost but the entire animal would've been around 5.5 meters long.
http://www.nationalgeographic.com/magazine/2017/06/nodosaur-3d-interactive-dinosaur-fossil/?utm_source=Facebook&utm_medium=Social&utm_content=link_fb20170515ngm-nodosaurinteractive&utm_campaign=Content&sf78985672=1
http://www.nationalgeographic.com/photography/proof/2017/05/nodosaur-fossil-discovery-science-photography/?utm_source=Facebook&utm_medium=Social&utm_content=link_fb20170514photo-nodosaurgallery&utm_campaign=Content&sf78781629=1
Adam Khor
"
Zuul
", a new ankylosaurid, or just
Euoplocephalus
?
I suspect the latter.
https://phys.org/news/2017-05-pristine-ankylosaur-fossil-montana.html
Manach
A dinosaur named after a Ghostbuster creature - very cool.
Adam Khor
Apparently, the two species are not found together- the smaller
S. mjosi
may have inhabited wet, cool woodland whereas the classic
S. stenops
we all know and love would've favored drier habitat (maybe like rhinos!):
https://www.geolsoc.org.uk/Geoscientist/July-2017/Montana-Treasure
Fathom
Interesting associations. Size and climate relationship comparisons. Smaller wetter. Larger arid. Size follows environment.
Adam Khor
It's sort of like African bush elephants and African forest elephants if you think about it. Also,
S. mjosi
seems to have smaller, rounder plates, which makes sense considering it would've lived in forests, where the efficacy of visual exhibition would've been more limited (and overheating would've been less of a problem?).
Rubecula
makes a lot of sense if you look at modern species. Canines do differing things in differing habitats as a good example. (see grey fox, red fox, arctic fox, fennec and bat eared fox.
Adam Khor
Exactly. May as well mention that there's another supposed genus of coetaneous stegosaurid now described, "
Alcovasaurus
", which may or may not be a species of
Stegosaurus
(in fact, it was originally known as
S. longispinus
). It is known by very incomplete remains but apparently has an unusually short tail compared to
S. stenops
, as well as extremely large defensive spikes.
Fathom
Has it been established that all 3 were alive at the same time?
Adam Khor
Now that you mention it... a quick search seems to indicate
Stegosaurus mjosi
lived a little bit earlier than
Stegosaurus stenops.
Seems I was too hasty... and now I'm wondering if S. stenops may have been the direct descendant of
S. mjosi.
Fathom
Some variations of Stegosauridae?
Rubecula
Fathom
wrote:
»
Some variations of Stegosauridae?
more than I actually realised
Adam Khor
The picture could be misleading tho, as many of them are known by measly fragments only and so the diversity of body shapes may actually be much greater than seen here.
Dacentrurus
and "
Miragaia"
may very well be the same thing, and "
Chungkingosaurus"
and "
Chialingosaurus"
are probably the same as
Tuojiangosaurus
.
In truth, only
Stegosaurus
,
Kentrosaurus
and
Tuojiangosaurus
seem to be known from decent remains.
Adam Khor
This spectacular fossil has been formally named- as
Boreopelta
. It still looks like a
Sauropelta
to me; same basic appearance, same region, same time. It may be just a second species of
Sauropelta
. The fossil shows it had countershading camouflage which today would be unusual in a large herbivorous mammal, but then the Mesozoic was dominated by huge, visually-oriented predators:
https://www.eurekalert.org/pub_releases/2017-08/cp-dha072717.php
Rubecula
some samples may be the same species but at different times of the year or of the individuals lives too.
Imagine about 100 million years in the future some types of deer fossils have antlers some do not and some have smaler antlers.
some may be hinds, some may bestags at different seasons and some may be immature. But all are the same species
and some deer are not..... how could future palaeontologists tell this from partial fossil records?
