The Darkmoon Glowfly is also a new addition, and can be found flying around the island. They can vary in level, so keep looking for that perfect one to catch!
Darkmoon Pet Bugs
The Crow pet (pictured) listed in the Pet Journal is currently not capturable. It can be found on the Darkmoon Island as a normal critter, and also as a secondary opponent during a wild pet battle.
It's unknown if the bug lies within the Pet Journal and the Crow was mistakenly added, or if it should be a capturable companion but currently isn't flagged as such. We suspect that it might be the latter, similar to the bug affecting these six wild pets, all of which were fixed shortly after the release of MoP. Hopefully this will be clarified and fixed soon!