Guntai Ari

The Army Ari (軍隊アリ) are a group of creature developed by Dr. Indigo for Shiki's plot to use monstrous creatures to attack East Blue to force the World Government to submit to him.

Using numbers to take down even enormous prey, they are always acting in a group. If they spot prey they will reducing it to bones in an instant.

They appeared in One Piece Film: Strong World, on their way to attack Brook, Robin and Franky, but they spot a Baku Zame and kill it. They try to attack the pirates again, but are defeated by Brook.

Trivia

 * Ari comes from the Japanese word, 蟻/あり/ari, meaning ant.
 * The spears that the Army Ari are holding actually stolen from an iron fence.
 * Though most of the Army Ari share a very similar appearance there are relatively fat and tall Army Ari as well.
 * The Army Ari run in a bow-legged manner.