Mamenchisaurus

[Endskull]

Honestly I saw that video and beside the more curved/elevated neck (which could totaly be just one specific animation), I'm almost sure it's just Apatosaurus with an alt skin. Diplodocus is way, way longer, especially the tail which is twice the size of the neck.

5 sauropods confirmed ? Brachiosaurus, Apatosaurus, Camarasaurus, Mamenchisaurus.... and please don't be Diplodocus or Brontosaurus. Let's have something with more unique features like Amargasaurus, Shunosaurus or Saltasaurus!

 

[Dinoken]

Well - Mamenchisaurus and Diplodocus would likely be longer than either Apatosaurus or Brachiosaurus. Definitely much longer than the Camarasaurus.

The largest species of Diplodocus (previously known a Seismosaurus) is estimated to have been about 30.5-33.5 meters/100-110 feet. Like wise the largest species of Mamenchisaurus is estimated to also be about 29-35 meters/95-115 feet long.

Remember that the JP/JW series tend to base the size of their dinosaurs off near maximum sized specimens. Case in point - Brachiosaurus thru out the series has been stated as being about 25.9-27.4 meters/85-90 feet long.
The North American Brachiosaurus is stated as being about 25-25.9 meters/82-85 feet, with the largest specimen estimated at being about 27.4 meters. And Apatosaurus in Jurassic World was stated as being up to 27.4 meters/90 feet long. The largest known specimen of Apatosaurus ajax (OMNH 1670) is estimated to be about 28 meters/92 feet long.

 

[m2wester]

Well - Mamenchisaurus and Diplodocus would likely be longer than either Apatosaurus or Brachiosaurus. Definitely much longer than the Camarasaurus.

The largest species of Diplodocus (previously known a Seismosaurus) is estimated to have been about 30.5-33.5 meters/100-110 feet. Like wise the largest species of Mamenchisaurus is estimated to also be about 29-35 meters/95-115 feet long.

Remember that the JP/JW series tend to base the size of their dinosaurs off near maximum sized specimens. Case in point - Brachiosaurus thru out the series has been stated as being about 25.9-27.4 meters/85-90 feet long.
The North American Brachiosaurus is stated as being about 25-25.9 meters/82-85 feet, with the largest specimen estimated at being about 27.4 meters. And Apatosaurus in Jurassic World was stated as being up to 27.4 meters/90 feet long. The largest known specimen of Apatosaurus ajax (OMNH 1670) is estimated to be about 28 meters/92 feet long.

Thing is, thanks to Carnegie donating Replicas across Europe a hundred years ago, the Diplodocus Carnegii is the better known species, and the one Frontiers devs would see in Londons Natural History Museum. And that one is "just" about 25 meters long. Also, Diplodocus was relatively lithe and weighed much less than Apatosaurus, let alone Brachio; it would look smaller even if it is as long or longer.

The mystery sauropod looks more slender than the Apato - in particular the neck and tail. I think Diplo is a possibility, though I do agree it looks a bit smaller than I'd expect, even for D. carnegii. Might be the perspective, or it might be a different Sauropod, or they decided to make their Diplo fairly small. I really don't think it's an Alt Skin Apato, though, it looks too different to me.

 

[Endskull]

We can be surprised, they have already made strange choices (such as pachy - stygi - draco... all being the same animal lol)

I'd like to point out that the JP Brachiosaurus is actually a Giraffatitan. Not so long ago known as the african sub specie, he's bigger and have longer front limbs than the american Brachiosaurus altithorax. It is now a separate genus.

 

[Werd]

The unknown sauropod could be dicraeosaurus if it is not diplodocus as it roughly matches its size in comparison with apatosaurus and there are two dinosaurs we do not know that start with c/d/e between ceratasaurus and edmontosaurus :

https://www.youtube.com/watch?v=mGs2G4iS_YI
15:40

There are 7 slots between them and the only known dinosaurs between them in alphabetical order (excluding deluxe edition and FK dinos) are :
Chasmosaurus
Corythosaurus
Deinonychus
Dilophosaurus
Dracorex

Leaving the 2 empty slots to be filled by :
Chungkingosaurus (alphabetically supported)
Diplodocus OR dicraeosaurus (both alphabetically supported)

 

[Lora Craft69]

The unknown sauropod could be dicraeosaurus if it is not diplodocus as it roughly matches its size in comparison with apatosaurus and there are two dinosaurs we do not know that start with c/d/e between ceratasaurus and edmontosaurus :

https://www.youtube.com/watch?v=mGs2G4iS_YI
15:40

There are 7 slots between them and the only known dinosaurs between them in alphabetical order (excluding deluxe edition and FK dinos) are :
Chasmosaurus
Corythosaurus
Deinonychus
Dilophosaurus
Dracorex

Leaving the 2 empty slots to be filled by :
Chungkingosaurus (alphabetically supported)
Diplodocus OR dicraeosaurus (both alphabetically supported)

But it has to come after Dilophosaurus alphabetically based on the leaked picture from the 25th anniversary event, so that leaves the Dicraeosaurus out and only the Diplodocus would be able to fill the gap, if it isn't anything else than a sauropod of course.

 

[Marveleg]

I know it's unlikely, but a sauropod like Kaatedocus could be amazing. This diplodocid was small, around 15 meters, and would fit the small, slender sauropod we saw in the dev video. But unfortunatly, he doesn't match the alphabetical order.