The basic idea being of course, that the spider and the starfish are entirely different in the way they work.
A spider has a single controlling "head", ( think normal CEO style hierarchical structures). Cut the head, and the spider falls apart. ( um mostly!)
A starfish on the other had, seems to have no such thing. Its so called higher brains functions, if there is such a thing, seem to be spread out. ( think the more distributed internet, eMule, what not). Cutting off any part of them, might just give you two full starfish, and probably wouldn't at any rate have the thing die off spider style.
Which was a think I often wondered when I read or saw things like war of the worlds etc where there always seemed to be a single nerve centre/ command centre, which the hero would figure out and disable, thus getting the whole thing down. And I remember thinking long back, yes I know thats how traditional armies work, but what if, just what if, you had an alien attack which didn't work that way?
An interesting look at the two diferent structures. Worth a read.