The mecha larva is a Mecha Swarm replication of larva created by Egon Stetmann during the End War. They evolve into the various strains that make up the Mecha Swarm, and are created from the mecha hatchery.
The mecha larva is the basic unit for Egon Stetmann in Co-op Missions. They function similar to the regular larva, and spawn Stetmann's units. Unlike the zerg larva, mecha larva are mechanical, and do not die when off of creep.