Wood ants have 3 models and 3 skin patterns for workers, melee soldiers and shooters. Check here: https://www.slugdisco.com/press/sheet.php?p=empires_of_the_undergrowth
The fish savagers are wood ant melee soldiers.
On the topic of the 5th tier ant species, I have been digging through a bunch of screencaps and notes. The hints for matabele ants and driver ants were quite obvious lol.
- Mid 2020, during an extra mission stream, John revealed that there will be termites and at least 2 ant species, one with 2...