This being the creature in question: the leech wyrm. It doesn't do much in the game except slightly annoy people and die, but it was faster to paint than another warship, so it had that going for it.
Also in today's post: the rusted wreck of a Dwarven vessel. What destroyed it? The leech wyrm? Who can say? I mean, Dwarves, man. For all we know they all just happened to drink themselves to death at the same time.
Here's all four of my currently painted Dreadfleet miniatures arranged in some kind of fracas.