Those look like very sad creatures, I would prefer a spider over it, but those could work. The thing about those though is that they are rare so it would be alright. I'd imagine the wolf spider would live through something, it is only on every land mass besides Antarctica. Or maybe some kind of beetle, they are only the most abundant animals in the world.
Invertebrates never get any glory...
A little imagination and hey presto! Cud be modified with a stinger, but I loved the massive pincer mouth thing on the first one, but a giant beetle is a good idea, giant antlers and spits acid at you or some sorta chemical defense system. Good thinking
(Spiders would have worked for me but I wanted something with a little twist, {Spiders} it was something I e-mailed beth about many many moons ago to include them in a future fallout game as a predator for a subway-system.)
The solafuge was my Sis's idea sort of combine dangerous scorpion nature with a fear of spiders (just remembered that)