So, I found out about this spell. I wanted to get it on my sorcerer but I got distracted and couldn't read the whole description. When I remembered again a moment later I went to look for this spell on the Sorcerer/Wizard spell list to read the description in detail. To my surprise the spell was not on the list under 4th level evocation spells. As far as I can tell this is not a 3rd party spell, so is there a reason for it not being on the list? Or is this just a minor mistake?
If the spell, as published, says it is on the wizard/sorcerer list, then it is.
The http://www.d20pfsrd.com is an unofficial source of information. Just like the Archives of Nethys (the spell is there though). They are mostly maintained by fans, and as such, they are more prone to error.
The official source of online information about pathfinder is Paizo's PRD. However, material published under softcover books hardly make it to the PRD, this spell being no exception. Usually only material published on hardcovers are published on the PRD (there are exceptions, see the technology guide).
It's propably an oversight : the spell lists by class have a lot of spells by Paizo missing, most of them being recent additions. The list in alphabetical order has every spell on the website, but it appears that spell lists by class weren't updated when new spells were added.