Puke Worm

Puke Worms are secondary enemies introduced in, that somewhat resemble leeches, and are generated by Regurgitators, which puke them to attack the players. Except in the aquarium on the mission VIP, there's no other way it can be encountered. Just like other regular enemies, they have Regular, Fetid, Evolved, and Apex versions. Puke Worms also possess the Regurgitators' buffs if spawned by them.

They also appear in the mission VIP as a hidden enemy within a fish tank, appearing when aforementioned prop is broken.

Trivia

 * Puke worms will not spawn any virus vials in Virus Samples, possibly because that they are secondary enemies, just like a regular worm.