I came across this the other night, but it appears I wasn't the first. Gozira, a different kind of spider, was kind enough to cross my path... and die in front of me. I was in the area around the Lephrechaun in the Enchanted Sea area.....
Apparently Sazerac and a couple of others found this guy a long time ago, but he's not that common. He was worth 7,707 XP each, or around 46,000 all told.
Didn't last much longer than a regular spider does...
Just thought I'd share