Sketch of Spinosaurus sp. walking through shallow water as a small Deltadromeus agilis watches in the swampy terrain of Kem Kem.
The conveniently-deep body of murky water is partially an excuse to not speculate further on the length of the legs of Spinosaurus (which is difficult to judge from the known specimen photos and inconsistent in the paper describing the new specimen).
I noted that between Becklespinax altispinax, Concavenator corcovatus, Ichthyovenator laosensis, and now possibly Spinosaurus aegyptiacus, dorsal “sail” or “ridge” morphology is highly variable, and it has been proposed to serve as a display structure in Spinosaurus. As such, it strikes me as possible that even closely related species would have had dramatically differently shaped “sails”. This design is based on an exaggeration of the speculative sail shape I used in my previous reconstruction of an "otter" Spinosaurus, crossed withthe admittedly unrelated Concavenator corcovatus.
Deltadromeus has a coat of filaments interspersed with osteoderms. It’s facing away because I didn’t want to speculate on its head; no skull material is known, and no reasonably similar dinosaur with known skull material is known—its closest known relative with a skull is either this or this, and both are less than 2 meters long (compared to the 7-12 meter Deltadromeus)!
You’ll note that both species are known to a large extent from an inadequately-descriptive Sereno paper. It really would be nice to see some of his more interesting taxa described in detail—as far as I know this is the only published image of Deltadromeus fossils!
Yes, this is the third spinosaur I’ve done in a row.