Sea Spiders aren't really spiders. They aren't even arachnids. In fact, they're barely more than legs. Not even the daddiest, longleggiest of Daddy Longlegs can out-leg a Sea Spider.
Trilobite Beetles are beetles of eternal youth! Or is it eternal age? After all, it's a beetle that never quite grows up but at the same looks a lot like a 250 million-year-old trilobite.
I guess you just can't keep a good arthropod down.
From the sounds of it, this must surely be the lowliest of all dragons. Fire dragons soar overhead, frost dragons slumber in beautiful ice lairs, swamp dragons brood in their stinking miasmas, even flightless flu dragons get to lie in bed all day.
What do poor old Mud Dragons get? They get to wriggle. In the mud. Hmmm... Someone drew a very short straw.