Abilities: Special, Extraordinary, Spell Like, Supernatural, Natural, get 'em here.

[Temotei]

The problem I see here is that it speaks specifically to a creature's ability as separate from a character's ability. I don't think that passage proves the spell casting class ability is a special attack. It does define it for non-classed casters though.

Indeed. Now the question is whether spellcasting is the same across the board (in a casting class as opposed to not in a casting class). I don't think I've seen anything to prove it either way, which suggests it's not, but others will likely know more.