Now, correct me or not if this has been retconned, but with our previous knowledge of the Vex, the base units are regarded as mining frames. We hear about warrior/combat frames invading Oryx’s throne room because of Crota, and being able to handle Ascendant Hive three to one.
Are Wyverns also considered mining frames? Or are they the start of the combat frames we will (hopefully) be seeing in the future?
Wyverns are the only combat frame, I believe. They're armed with no visible tools for research, only those blasters and that Blam!-ing jump attack.
I know that Hydras act as CPUs, and I think Harpies are meant to observe the sky. Minotaurs are builders.