"but eventually Coolsteph began to fracture into dozens of smaller islands, before each was reclaimed by the sea."
That's like looking at my own obituary. (The grammar is valid, but it still feels weird.)
With all the genus group and non-genus group things it eats, as well as dung, detritus and rotting flesh, it's practically impossible to make these go extinct of starvation. I would not be surprised if they survived a Great Dying-esque event.
I like the texture and the art, overall.
You made a few typos, like "scavanger".