From Destinypedia, the Destiny wiki
Brood Queens are special variants of Wizards that are responsible for birthing entire legions of Hive. As a result of their important role, Brood Queens are so well hidden and protected that expeditions and missions launched into the Hellmouth on the Moon don’t even mention them.
The first Brood Queen ever encountered, In Anânh, Brood Queen was larger and looked noticeably different from other Wizards; possessing a large abdomen with bony protrusions that ended with a tail.
Brood Queen's are a superior form of wizard than their Brood Mother lesser. It is unknown what connection the two forms have to each other.
Known Brood Queens
List of appearances