#tetanurae

[qarkudon]

Allo headshot final

[makairodonx]

Jurassic June 2024 Day 30: Allosaurus fragilis

[obscurefossils]

Siamraptor

Siamraptor was a genus of carcharodontosaurian dinosaur from the Early Cretaceous period. Its type species is S. suwati. The holotype was found in the Khok Kruat Formation in northeastern Thailand. Siamraptor is the first and currently only definite carcharodontosaurian known from Southeast Asia.

"Siam" is derived from the original name of Thailand, "raptor" is Latin for robber, and the specific name suwati refers to Suwat Liptapanlop, a supporter of the Northeastern Research Institute of Petrified Wood and Mineral Resources.

Its autapomorphies include a jugal with a straight ventral margin and a deep anterior process below the orbit, a surangular with a concavity and four posterior foramina, a groove along the suture between the surangular and prearticular, an articular with a formen at the suture with the prearticular, a cervical vertebra with an additional foramen that is excavating the parapophysis, and the presence of a pair of foramina at the base of the neural spine on the cervical and posterior dorsal vertebrae. Another possible autapomorphy specific to the genus may be a deep concavity excavating the posterior end of the lateral shelf.

Siamraptor is known from its holotype, consisting of a posterior right mandible including the surangular, prearticular, and articular; as well as referred material from three other individuals including three right premaxillae, a right and left maxillae, a left jugal, two posterior parts of the left mandible, three cervical vertebrae, a caudal vertebra, a manual ungual, a right ischium, a section of the left tibia, and a left pedal phalanx. Siamraptor was recovered as a definite carcharodontosaurian, though its relationships within the clade are uncertain. It may have been a derived member of Allosauria outside of Allosauridae or a basal member of Carcharosauria in a polytomy with Eocarcharia, Concavenator, and Neovenator.

Original paper: Original description paper

Wikipedia article: here

[kararadaygum]

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[procyonvulpecula]

Hi everyone, hope you’re all staying safe and staying indoors during this pandemic!

I had a go at drawing a Tyrannosaurus rex skeleton in Paint (I based it on lots of different drawings and photos of skeletons I saw, but the one I used the most is the Nation’s T. rex at the Smithsonian. The leg stance is my own, so palaeotumblr, let me know if that’s anatomically impossible!)

After that I decided to have a go at giving it a body. I hope I didn’t make it too shrink-wrapped?

Palaeoartists - feel free to give me a critique so I can improve for next time!

A few things I opted to include, along with sources linked:

Feathers on the back and arms, but nowhere else.

Lips. Enamel has been found preserved on theropod teeth, which needs to be kept wet. Crocodilians live in water so don’t need lips, but theropods may have.

Crocodile-like integument on the face.

Neck ribs and gastralea (stomach ribs), which are delicate, hard to mount and often missing from museum skeletons!

Keratinised facial features are from this Your Dinosaurs Are Wrong video.

I tried to make it obvious that the eyes face forward, the hands are supinated, not pronated, and the feet are digitigrade - common mistakes in beginner dino art!

Possible mistakes I can see already, palaeotumblr let me know!

The tail looks way too thin to be an effective counterweight to that huge head, should it be thicker?

More keratin on the lachrymal than just that little eyebrow-like ridge?

Would the feathers stop there, or would they plausibly extend all the way down the dorsal side of the tail? I know the ventral side was scaly as we have impressions for that. 

The teeth need to be more obviously heterodont, but that’s hard to draw in Paint!

[paleospec]

Monolophosaurus jiangi (Zhao & Currie 1993) Klad - Tetanurae

[paleonativeart]

My new design on Spinosaurus of 2020 is finally done as well. This coloration are both based on marabou stork as a head and neck, and the body is based on espanola marine iguana which is referred as Christmas Iguana due the brightest colors instead of dull dark gray.

[tapwing]

:Tetanurae matriarch: 3-6 To confirm foreign development the team located and recalled one of our active Matriarchs to compare how the ‘caged’ and ‘wild’ specimens develop. The cage Matriarch grew only slightly and remained physically unchanged. The wild specimen however, grew substantially and adapted common traits of theropoda. Losing it’s wings and developing denser structure along with a more muscular build that serve it in grappling or climbing. Some unknown growths spark concern, but nothing outside of the current margin of error. Further observation required.