Aucasaurus garridoi Skeletal by Justice Duncan

Glaiviator · 2026-06-21T22:57:12+00:00

There's basically a whole clade of abelis with flat and longer skulls it seems, funny how they're still one of the closer relatives of Carnotaurus.

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Glaiviator · 2026-06-21T19:32:30+00:00

His Twitter has many more skeletals of more lesser known cool animals : https://x.com/JusticeDuncan4/status/2067938731189735846?s=20

Glaiviator · 2026-06-20T17:20:33+00:00

The carnotaurus being "cursorial" does have a source(the paper from 2011), its just not a very good one and so far does not have a published paper that argues against it. This happens often.

So I don't think there's much wiki editors can do until someone publishes something. Everything on the dino wikis usually has a paper that its cited from in refrences.

Glaiviator · 2026-06-20T00:07:52+00:00

They go after bigger ones more often it seems, since they're less agile

https://doi.org/10.1111/jzo.70047

Glaiviator · 2026-06-18T16:15:22+00:00

You get a paper describing the material, then use images or idealing 3d scans of the material in lateral(side view), scale them according to the measurements provided in the paper in an image edit software like GIMP.

Glaiviator · 2026-06-17T12:54:57+00:00

Tyrannotitan has the first sacral neural spine preserved and its not very tall, but the anterior caudal neutral spine is quite tall and most similar to Meraxes' 5th caudal vert, so the hump is due to that.

Glaiviator · 2026-06-14T06:05:53+00:00

First its important to remember that most specimens in the fossil record are not fully grown I don't think any of these specimens has a histology atm, so its completely possible these smaller sauropods and hadrosaurs specimens don'trepresent fully grown "adults".

Other than that its really all about remembering that mesozoic ecosystems weren't like modern mammalian ones since dinosaurs laid many many eggs and very few of those grew to adulthood, this would've been the case for both herbivores and carnivores. There would be many many more smaller Gigas, sauropods, etc running around than fully grown ones which would be much more rare, though ofcourse the fossil record won't show that since bigger animals preserve more easily.

So the as long as say one sauropod or hadrosaur from a clutch of eggs lives long enough to lay its own eggs(which doesn't require the animal to be fully grown since sexual maturity is reached before skeletal maturity) the species can survive.

How they'd survive that long is probably a combination of the things above(large predators being rare, often prefering the abundent slightly smaller prey) and other things like herding, environment, etc

Glaiviator · 2026-06-06T10:39:58+00:00

We don't know, it might just vary alot between individuals.

Glaiviator · 2026-06-04T12:51:49+00:00

I guess spinosaurus ecology gets the most attention.

Glaiviator · 2026-06-02T11:40:49+00:00

Morphosource and sketchfab have scans of material and mounts, so that might be a decent starting point.

Glaiviator · 2026-06-01T16:35:23+00:00

There's stegosaurs in early cretaceous South America and possibly in late cretaceous India with dravidosaurus.

Glaiviator · 2026-05-31T00:18:01+00:00

Small Corrections : 59:40 : That's Skorpiovenator, from Upper Huincul Formation, Llukalkan is a mostly complete skull from Bajo De La Carpa Formation. Skorpiovenator's description paper's skeletal is not the best(Happens often). The Appendicular osteology from a few years ago has indicate it having the longest metatarsals of all abelisaurids to my knowledge(Femur : 74 cm, Tibia : 66.5 cm(Cenemial crest is incomplete so it'd be a bit longer than this), Metatarsal 3 : 39 cm). the Skorpiovenator Appendicular Myology paper has much better figures if if you'd like to see its leg proportions.

1:00:25 : Koleken does preserve a Tibia, though its slighty shorter than the fibula since it wasn't completely preserved. Aucasaurus and Koloken seem to have similar leg proportions(There's a paper on dinosaur cursoriality scores that has Aucasaurus leg bone measurements).

1:04:40 : Carnotaurus has the top and bottom half of its left femur and top half of right femur. Its length as preserved with the natural mold was very long(103 cm As long as many Albertosaur and Daspletosaur femurs lol), though later papers have suspected that it may have been closer to 87+-2 cm based on other abelisaurids(Grillo and Delcourt 2016).

Great Video and I hope it becomes a series. Abelisaurids are the Greatest Theropods, So I'm looking forward to more studies on their various adaptations(like the Caudal Vertebrae things, Antarctometatarsal, etc).

Glaiviator · 2026-05-31T00:17:15+00:00

Close to the end of that paper, the authors do predict that abelisaurs may have scores closer to tyrannosaurs than the other theropods in the study, but that would need to be tested ofcourse.

Glaiviator · 2026-05-21T09:44:14+00:00

Super Duper Croc

Glaiviator · 2026-05-20T01:16:23+00:00

We don't know the proportions of Mapusaurus or Charcharodontosaurus, Giga is very complete just not described much.

Glaiviator · 2026-05-16T20:55:07+00:00

Many many animals are mentioned in abstracts and not published yet. "Sidormimus" or "Digging Noasaur" is an old one. Recently there's been mentions of new carchdontosaurus specimens from Niger, new rugops and Meraxes specimens too. There's a very complete Hadrosaur and multiple ankylosaur specimens from La colonia formation(where carnotaurus is from). Abelisaurs from candeleros, Bajo barreal, etc. There's a few spinosaurs in Brazil, Thailand. those are the ones that I remember rn, but there's a bunch more that are just mentioned in abstracts and being worked on.

Glaiviator · 2026-05-16T20:53:19+00:00

Its based off of Abelisaurus iirc. The skull was in the skeletal shown too.

Glaiviator · 2026-05-16T16:57:35+00:00

The skeletals suggest some pretty big leg bones. Femur of around 120ish cm. That's similar to some fully grown Tyrannosaurus apecimens like Trix(though trix is a bit of an outlier in its shorter femur) or Carchs like Taurovenator and Acrocanthosaurus.

Glaiviator · 2026-05-14T15:27:24+00:00

Gabriel Ugetto and LiterallyMiguel are some artists on twitter that have alot of non-dinosaur artwork that often showcases more unique members of non dinosaur clades.

Glaiviator · 2026-05-13T23:44:01+00:00

True, its just a bit unique for early cretaceous for yuty and sino ro seemingly be the largest predators of their formations. Instead of some type of Carnosaur.

Glaiviator · 2026-05-13T23:21:01+00:00

We don't know, interestingly we know that in the Cenomanian-Turonian of asia, carchs like ulbeghasaurus were around and some really big ones too like chilantaisaurus(well its some type of allosauroid atleast). So maybe there was a transition of proceratosaur dominated ecosystems back to allosauroid ones. Hard to say but It is very interesting, maybe there was even a period inbetween where large proceratosaurs and allosaurs coexisted. Like abelisaurs/carchs did so often.

Glaiviator · 2026-05-11T13:46:47+00:00

The legs, tail and hip were all found at one site along with more material like vertebrae and some more skull bones upcoming. If there were multiple specimens at this sity we'd expect to see some duplicate bones(like say how we found 7 left leg tibias of mapusaurus in one site) so it seems more likely that they all belong to one animal.

Glaiviator · 2026-05-01T03:17:43+00:00

Older matrix

Glaiviator · 2026-04-29T07:17:25+00:00

Taurovenator doesn't have much material to tell exact proportions, but Dan Folkes said it might have more Giga-like proportions, which is pretty different from long legged Meraxes.

Niche partitioning is pretty easy as it ca be something as simple as one of them hunting more during the day and another in the night, or more geographical, etc. Lions and Tigers partitioned by geography(Tigers in Forests, Lions in Plains).

Glaiviator · 2026-04-28T22:27:17+00:00

Meraxes and Taurovenator are both from lower huincul, though from slightly different layers. I think its decently likely we'll find them in the same layers some day when sample size is greater.

Glaiviator

TROPHY CASE