Nearly ten times the size of regular Transport Bugs, Super Transports are used to carry the Queen and a small army, including several Transport Bugs and a full battery of Plasma Bugs, across star systems.
Super Transport Bugs can cover a distance of some 75 light-years at speeds comparable to human-built starships.
These massive Transporters play the role of battle ships and escort ships for the Arachnid forces' navy/fleet.
During the episode "Trackers", there are many Super Transports used as decoys.