There are two research entries that I am missing:
- The "diet" entry of Prax Zoa
- The last entry in Phyta just labeled "Research Pending"
They are both unlocked by feeding a Feran Seed to each of the creatures.
If you throw a Feran Seed too hard it will hit the wall and explode, killing the creature. The key is to throw the seed very carefully by having the cursor as close to your character as possible before throwing it.