Pokemon can be based on more than one thing, and their designation in the dex is rarely exhaustive (Sandshrew is much more a pangolin than a mouse for instance). In Wiglett's case the way it poses and behaves shares a lot with garden eels, but its actual body is indeed more like a worm in appearance (something they had little choice but to do if they wanted it to look very similar to Diglett). But then again having no apparent fur or limbs didn't stop Diglett from being called a "mole."I’ll post this again with more detail as nobody replied and I think this is information nobody discussed.
I don’t like the Pokémon type of Wiglett or it’s design to match.
For one, it’s called a garden eel Pokémon but it looks more like a sandworm or tube worm Pokémon. Garden eels have gills, tiny side fins, and a long back fin and tail and teeth in a jaw. I’ve yet to see any of those on Wiglett. I think they made a big mistake with its description.
Idk why they make it look like diglett if it’s not related that just seems dumb. Make it look like an eel.
Basically, you're asking it to adhere to being a "garden eel" a lot more than is necessary for it to have the name. Just look at all the spider pokemon that don't have eight legs.
If there is one thing I dislike (rather than feeling neutral about) or at least am confused about, it's the decision to have the sand around Wiglett rotate along with its body. Why not just keep it still and have the Wiglett rotate within it? They don't seem to be going for the idea that the sand is connected to its body in its biology.