Certainly my favourite bug type, Galvantula is boss. Had one in white as well, ended up pushing two other contenders (Excadrill and Darmanitan) from the main team in the process. Mine didn't take hits so well, but very few things ever got the chance to hit him before he obliterated them.
It's a pokemon. It has multiple legs, multiple eyes and a variety of web based attacks - if you want more stringent anatomy than that, I think you're looking in the wrong place.
My fav pokemon ^_^
I have a Galvantula in my White game called Andy and hes my highest lvl pokemon at lvl73
Dude is a one mon army. hes tooken fire atacks and still has enough hp to fhight back.
I usely use my Galvantula to distroy Psychic types.
Ive nevr been a fan of theam and its awsome seeing Andy take down high levl psychics.
He destroyed a mewtwo once ^_^