Just out of curiousity I checked this manga out after reading the plot summary. So I started with the first few chapters, meaning "Bugs I" arc but wasn't really hooked right away. I kept reading and, oh boy, has it creeped up on me (pun intended XD).
"Bugs II" arc was already cool, but "Annex I" took it to the next level. That's why I'm quite happy that the Anime series gonna start with "Annex I" right away. More action and chararcters from the start.
That's the main strength of this manga for me, alot of characters with different backgrounds and powers and every character has its own agenda. Love it.
We've seen so many insect bases already, now even with plants, birds, eel and bacteria, but as one has mention earlier there is one significant beetle who was left out, I believe for a really strong character, maybe on the roaches side. The Dung Beetle, considered pound-for-pound the strongest animal out there, can carry over 1000 times its own weight.
And guess what, the Scarabaeus, the sacred beetle from ancient Egypt, is a type of a dung beetle. So there would be a tie to the pyramids already. And according to Wikipedia, dung beetles are the only insect which uses the night sky to navigate. Now that's something. But maybe I'm reading too much into this.
Would be a waste of a really awesome base for a M.O. operation. And I'm really curious of the Roman Division leader's base, he stockpiles roaches like they were actually cockroaches. Crazy strong dude. Should be fun to see on which side he is.