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Description
An Onchopristis gets fished up by a giant carnivorous theropod... the legendary mega fish-eater of the Kem Kem Beds... Carcharodontosaurus!

That sounds right, yeah.

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Mid Cenomanian (95 MYA), Morocco

Onchopristis numidus (Numidan bulk-saw)- a species of sclerorhynchid ray known from the Cenomanian of North Africa. A very large freshwater or brackish sawfish, it could have possibly grown up to eight metres, slightly larger than the biggest modern species (of which it is actually only distantly related). The genus is distinct in possessing barbs on its saw teeth, this species only has one barb per tooth, but other species of Onchopristis have a more variable number. Like modern sawfish, it probably hunted by thrashing its rostrum back and forth to incapacitate small prey, or pinning it to the riverbed with its specialized snout, navigating the clogged and murky waterways with its electroreceptory organs. Like many prehistoric cartilaginous fish, it is known primarily through its numerous fossilized teeth.

Carcharodontosaurus saharicus (Saharan [jagged/sharp tooth] lizard)- a species of carcharodontosaurid carnosaur known from the Cenomanian of North Africa. Estimated to grow twelve to thirteen metres in length and perhaps between six to eight tonnes in weight, it was one of the largest known predators to have ever walked the Earth. The genus is named after its huge, serrated teeth, which were likened to those of the great white shark. Similar to other carnosaurs, they probably hunted mostly sauropods, which were really the only definite herbivorous dinosaurs known from the time and region (baring a single footprint from a large ornithopod known from the Kem Kem). Another species (C. iguidensis) of similar proportions but with slight differences of the skull is known from the Echkar.

generic turtles- the Kem Kem has a lot of turtles... pretend these are one of them... maybe Apertotemporalis baharijensis...

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For real though, I've seen somewhere around twenty to thirty drawings/reconstructions of Onchopristis being hunted by Spinosaurus, and that's not even counting illustrations that just happen to have Spinosaurus and Onchopristis together. It's probably the Tenontosaurus of prehistoric cartilaginous fish. Because I enjoy being contrarian, here is Carcharodontosaurus fishing instead, because just because you have no obvious adaptations for a specific lifestyle doesn't mean one cannot partake in that lifestyle, particularly fishing!

On the other side of the coin...

Description
An Onchopristis gets fished up by a giant carnivorous theropod... the legendary mega fish-eater of the Kem Kem Beds... Carcharodontosaurus!

That sounds right, yeah.

---

Mid Cenomanian (95 MYA), Morocco

Onchopristis numidus (Numidan bulk-saw)- a species of sclerorhynchid ray known from the Cenomanian of North Africa. A very large freshwater or brackish sawfish, it could have possibly grown up to eight metres, slightly larger than the biggest modern species (of which it is actually only distantly related). The genus is distinct in possessing barbs on its saw teeth, this species only has one barb per tooth, but other species of Onchopristis have a more variable number. Like modern sawfish, it probably hunted by thrashing its rostrum back and forth to incapacitate small prey, or pinning it to the riverbed with its specialized snout, navigating the clogged and murky waterways with its electroreceptory organs. Like many prehistoric cartilaginous fish, it is known primarily through its numerous fossilized teeth.

Carcharodontosaurus saharicus (Saharan [jagged/sharp tooth] lizard)- a species of carcharodontosaurid carnosaur known from the Cenomanian of North Africa. Estimated to grow twelve to thirteen metres in length and perhaps between six to eight tonnes in weight, it was one of the largest known predators to have ever walked the Earth. The genus is named after its huge, serrated teeth, which were likened to those of the great white shark. Similar to other carnosaurs, they probably hunted mostly sauropods, which were really the only definite herbivorous dinosaurs known from the time and region (baring a single footprint from a large ornithopod known from the Kem Kem). Another species (C. iguidensis) of similar proportions but with slight differences of the skull is known from the Echkar.

generic turtles- the Kem Kem has a lot of turtles... pretend these are one of them... maybe Apertotemporalis baharijensis...

---

For real though, I've seen somewhere around twenty to thirty drawings/reconstructions of Onchopristis being hunted by Spinosaurus, and that's not even counting illustrations that just happen to have Spinosaurus and Onchopristis together. It's probably the Tenontosaurus of prehistoric cartilaginous fish. Because I enjoy being contrarian, here is Carcharodontosaurus fishing instead, because just because you have no obvious adaptations for a specific lifestyle doesn't mean one cannot partake in that lifestyle, particularly fishing!

On the other side of the coin...