Henry @Randomdinos01

Master's student in zoology / paleontology enthusiast. Loves saurischian dinosaurs and random other megafauna. Scientific advisor for @JFD_001. Joined October 2019

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Henry @Randomdinos01

5 days ago

@KrzysztofS86r No, but @Ender_2907 estimated its mass at ~7.3t.

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Tylosaurus specimens have been found with stomach contents including the remains of turtles, sharks, sea birds, plesiosaurs, and even other mosasaurs. For the Lizard King, everything in the Cretaceous seas was a potential meal.

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Henry @Randomdinos01

6 days ago

@RTippytoes65154 @PPaleoartist That's correct, specifically based on a remarkable specimen with soft tissue outline described by Glup Shitto et al. (2018)

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Henry @Randomdinos01

a week ago

Alternate version with a bit more soft tissue on the neck. It's not clear if they had a seamless transition from head to body, like ichthyosaurs and cetaceans, or necks more like regular lizards.

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Henry @Randomdinos01

a month ago

@EmuLarge @TomHoltzPaleo It has a nice skull, but I'm more of a fan of the big guys.

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Henry @Randomdinos01

a month ago

Over 60% of the length of the plesiosaur Albertonectes is made up of its neck, which is the longest relative to body size of any animal ever discovered. At 76, it has more vertebrae in the neck alone than most species have in their entire bodies.

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Henry @Randomdinos01

a month ago

@HappierKindaSad They're warm-blooded predators, so I'd guess not unusually long. Food might take a while to get to the stomach though...

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Henry @Randomdinos01

a month ago

@nbtapioles Mamenchisaurus hochuanensis has a neck about 47% of body length. Sauroposeidon is too incomplete for that kind of estimate, but Omeisaurus gets up to 50% and so does Xinjiangtitan, having the proportionally longest complete necks of any sauropod.

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Henry @Randomdinos01

a month ago

@marquez_al99630 Each bone was drawn separately; most of them I took from Madsen (1976) - Allosaurus Fragilis: a Revised Osteology, then articulated them and drew over them. The ribs were based on a mounted skeleton at the USNM and the gastralia on Big Al 2 (SMA 0002).

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Henry @Randomdinos01

3 years ago

A highly versatile predator, Allosaurus was capable of tackling everything from stegosaurs to sauropods to other allosaurs. With some of the most complete individuals being riddled with healed -and unhealed- injuries, theirs was a very dangerous lifestyle, even for a theropod.

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Henry @Randomdinos01

2 months ago

@ArtemijAnd42837 This reconstruction follows the interpretation of some ''Alamosaurus'' specimens as lognkosaur relatives (Tykoski & Fiorillo, 2017; Navarro et al., 2022). As no lognkosaur has a skull preserved, Inawentu is the closest reference.

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Henry @Randomdinos01

2 months ago

The traditional concept of "Alamosaurus" is now believed to represent multiple different species of large North American titanosaur. Some of these have been suggested to be relatives of South American lognkosaurs like Patagotitan and Puertasaurus, though this is far from certain.

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Henry @Randomdinos01

2 months ago

@TM9380 Paul is the first to comment about it in a while, but other teams have similar ideas (most notable to me was a 2018 SVP presentation by John A. Fronimos et al.), albeit unpublished.

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Henry @Randomdinos01

4 months ago

@KellelJhonson @argoncanister I think it's perfectly fine, 326 cm rounds up to 3.3 meters anyway. But if you added cartilage between the limb bones and thicker padding to the feet, then his reconstruction would be a few centimeters taller.

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Henry @Randomdinos01

4 months ago

While its anatomy is not as thoroughly studied as that of T.rex, well-preserved skeletons in multiple stages of growth allow us to reconstruct the life history of Tarbosaurus much more clearly than its North American cousin's... especially after Zanno & Napoli (2025).

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Henry @Randomdinos01

4 months ago

@argoncanister Thanks! 551-1 is tricky to cross-scale because its vertebrae are wide, but very short anteroposteriorly (probably crushed). I wouldn't go below 330 cm in hip height, though.

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Henry @Randomdinos01

5 months ago

@BrunenAlfaro Patagotitan loses approximately 1 meter in length per year, meaning that around 2054, it will cease to exist

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Henry @Randomdinos01

5 months ago

Starting off 2026 with a remake of one of my oldest works, Patagotitan! Even though it's not the largest, the completeness of its remains makes it one of the most impressive dinosaur discoveries. Seeing a cast of the skeleton in person was absolutely breathtaking.

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Henry @Randomdinos01

5 months ago

@WolandtheArtist It's an even more efficient strategy for sauropods, as they are able to process food without chewing - most of an elephant's feeding time is spent chewing, while a sauropod just swallows a mouthful of plants and is free to grab the next one.

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Henry @Randomdinos01

5 months ago

@enfamiliados @cambroraster SMU 74646 has the best-preserved spines, and they are indeed shorter than what I reconstructed, but the holotype of A.atokensis preserves spines along the neck that are much taller than the SMU specimen and fit more closely with Fran's mount. And thank you!

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Henry @Randomdinos01

5 months ago

Merry Christmas! While the genus Acrocanthosaurus is currently only known from a single species, differences in the skull of the largest known specimen suggest that the giant sail-backed carcharodontosaurs may have been more diverse in North America than we thought.