The Geophilid Worm is a type of Worm and antagonist in episodes 23 and 24 of Kamen Rider Kabuto.
Kamen Rider Kabuto
The Geophilid Worms were sent out to hunt down those who possessed pieces of the Shibuya Meteorite that brought the Natives to Earth. The four Geophilid Worms were destroyed by Kabuto and Gatack.
Later on, two Geophilid Worms were encountered by Kabuto and Gatack in Area X but were destroyed by both of them with their Rider Kicks.
Kamen Rider Decade
A Geophilid Worm was part of a group of four Worms that attacked Natsumi Hikari during the shifting of the dimensions, only to all be destroyed by Kamen Rider Decade as Kamen Ride: Kabuto.
A Geophilid Worm later targeted Mayu in the World of Kabuto, but was destroyed by Decade.
Kamen Rider Decade: All Riders vs. Dai-Shocker
The Geophilid Worm was among the monsters who were part of the Dai-Shocker army in the World of Decade. They fought against a gathering of 25 Kamen Riders who formed to oppose Dai-Shocker's invasion of the A.R. Worlds.