Also didn't care for the "Pitch Black" like creatures.
Weren't those Acklay creatures? I assumed that since it was a moon of Geonosis, and there were Acklay in the Geonosis arena that they were supposed to be Acklay.
They made a noise like the Acklay, but didn't look like them. Perhaps it's the animated version of them? A cousin?
Edit: according to wookieepedia, the creatures are called Bonzami.