The Gulp Worm (砂虫,sunamushi?) was bio-weapon species created from manipulating earthworm DNA with the t-Virus.
The Gulp Worm was created by the administration of the t-Virus as part of a bio-weapons experiment to improve the earthworm genome.[excerpt 1] The series was still in the prototype stages during the Rockfort Island Incident, and the only known sample was used as a practice opponent for Rockfort Island's Anti-B.O.W. trainees.