The Conch King (貝螺王, Baira Ō) was a summon of Kandachi who used its abilities with hand seals. The Conch King and Kandachi were defeated by Naruto Uzumaki's Big Ball Rasengan.
Trivia
The Conch King might have been inspired by the sazae-oni of Japanese folklore.
Despite being called "Conch King", this creature is made of three parts, only its tail end resembling a conch while the other two segments resembled those of an oyster.