From SC2Pod
Larvae can mutate into any other Zerg unit. They are the Zerg's equivelant of the Protoss and Terran unit production buildings. Larvae are produced automatically over time by every Hatchery, and are produced more quickly as the Hatchery evolves. A maximum of 3 Larvae can be supported by each Hatchery, but all 3 can mutate simultaneously. This gives a Zerg player the ability to create enormous armies in a matter of seconds in order to overwhelm his or her opponents.
Lore
The closest creatures to the original Zerg insectoids are the Zerg Larvae. Although their size and toughness were greatly boosted by the Xel’Naga during their experiments, they still possess the two traits that originally intrigued the ancient masters: genetic versatility and psychic sensitivity.
Each larva contains within it the genetic makeup of every other Zerg breed. A young hive will only have the genetic code for the most basic of Zerg breeds, such as the Drone, but as it grows and develops new structures, the larvae can expand their library of genetic strains. With a command from the Overmind, the larvae will enter a pupal state and begin the metamorphosis into whichever breed is required by the hive.
Mutates Into
Upgrades
StarCraft 2
The Larva's StarCraft 2 model
The
Larva is still used as the Zerg's production mechanic in StarCraft 2. It has not changed much, other than having gained some new units it can mutate into, and losing some old ones. As part of increasing the game's macro mechanics, the
Queen is now able to spawn 4 additional Larvae at any
Hatchery, which allows for even faster massing of units.
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