User blog comment:BannedLagiacrus/Monster Appreciation Week: Nerscylla/@comment-4702773-20150429142121/@comment-5043481-20150429144746

Strange thing is, thinking about it nerscylla has very little in common with the spider it is based on. It walks on 4 legs not 8, and it has a head. Spiders don't have a moveable head joint.

Maybe the small number of legs is to help animating. They do all that by hand, 8 legs is a lot to do.