New base class spell lists and how they interact with old rules

[Ravingdork]

This has been discussed elsewhere. This thread is for FAQing.

Rules on Spell-like Abilities wrote:

Some spell-like abilities duplicate spells that work differently when cast by characters of different classes. A monster's spell-like abilities are presumed to be the sorcerer/wizard versions. If the spell in question is not a sorcerer/wizard spell, then default to cleric, druid, bard, paladin, and ranger, in that order.

What do you default to in the case of spell-like abilities that don't fall on any of the above class' lists? Where do the new classes from the Advanced Player's Guide, Ultimate Magic, and the Advanced Class Guide fall in the above list?

What about wholly unique spell-like abilities?

[Nefreet]

If there's no obvious link to another class, I believe the default assumption is that it is considered arcane. If the SLA is obviously divine in nature, it is considered divine. I don't see much of a reason to attribute unique or obscure SLAs to a particular class.