This one breaks the habitat rule:
"--Types--
You can choose any combination of 2 except Polar/Tropical or Mountain/Marine."
Specifically, it lives in Temperate, Tropical, and Mountain (in the form of Maineiac Volcanic) biomes. There isn't a wildcard rule on Alpha yet, so this isn't possible. Removing it from Maneiac Volcanic is the easiest fix.
These are probably going to have a big ecological influence. Generation 162 will probably be the "Generation of the Seashrog", in an event as important as the Great American Interchange.