Some of my ideas:
PlantsTrees= long grasses
Farmed plants = Fungus
Leaf-cutter ants live in tropical and semi-tropical rainforests in South and Central America. They cut leaves and carry them to their underground nests, where they chew the leaves into pulp. The pulp is stored with ant feces. A fungus grows on the decaying plant matter; this is the leaf-cutter ant's diet.
Gathered plants = Sugar granules, gathered human food?
Domestic animalsAphids -
Some species of ants "farm" aphids, protecting them on the plants they eat, eating the honeydew that the aphids release
Caterpillar
Grasshopper
Wild AnimalsPretty much every insect you can think of...
(Semi)MegabeastsGiant magnifying lens, flying, firebreath attack etc.
Anteater, Erm long paralyzing tongue attack, high damblock.
I am sure you guys can think of more...
MineralsThis is where I am going to have to bring in some fantasy elements as ants generally didn't smelt ores... One idea that i have is that all ground layers are dirt like layers, I am not sure if this will work though. I could base it on this chart:
where the top layers are humus and the bottom layer is actually the rock layer. Minerals can be in the middle layers. I know next to nothing about geology or soil so someone else might have to give me a little advice to what these layers could be called.
Weapons/armorThe smelted ores could be used to make little weapons, sheilds and armor. I will probably stick with variations to the hammer (heavy thumper), spear (poker), sword (slicer), axe (chopper) and mace (spikey thumper). The projectile weapons seem a bit to far fetched so I wont be having any.
Other racesCurrent ideas:
Wasps (goblin like, except flying)
Beetles (Human like)
ladybugs/ladybirds (elf like)
Spiders (another hostile goblin like race)
Roaches (like kobolds except relatively humongous)