The Culex Worm is a type of Worm and the main antagonist in episodes 23 and 24 of Kamen Rider Kabuto.
Kamen Rider Kabuto
The Culex Worm copied the form of Ichiro Ikesu, a famous cook whose cuisine could manipulate emotions. He intended to take over the world with his cooking, but was stopped by Souji Tendou, who beat him with his cooking. He later attempted to kill Tendou to obtain the memories of his cooking skills, only to be destroyed by Kabuto's Rider Kick.
Kamen Rider Decade
A Culex 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.
Kamen Rider Wizard
A Culex Worm molted from one of two Salis Worms that attempted to take the chest containing the 13 Rider Rings to Amadum from Haruto, while the other evolved into the Cammarus Worm after Faiz and Kabuto were summoned. After being joined by Musca Worm, the three Worms fought Faiz Axel and Kabuto in a super-speed battle across the city which led them right next to Double and Fourze's battle with Masquerade Dopants and Stardust Ninja Dustards. The Culex Worm and Cammarus Worm were then destroyed by Kabuto with a Rider Kick.