It is specifically based on a honeypot ant, whose workers get so gorged with food that their abdomens swell up like Formicidaean Ariant's.
Its exploding abdomen could be inspired by Colobopsis saundersi, a type of ant that can rupture its gaster as a defence mechanism.
Since that Formicidaean Ariant is intended to parallel Altaroth, insectoid monsters with the abdomen-swelling characteristic. Cat Base with its swollen abdomen. After a short time. It causes lots of damage to the cat base.