Anyway, going by Biologis research queue, here's my best guesses at what they might help:
Avalanche Shrub: The main benefit I see might be either Siege development or a psychic power that does the same.
Meteor Fig: Defences? Pyromancer psychic power?
Poison Lichen: -Upkeep cost (Better way to handle poison lichen), Biomancer poison power.
Sargasso Kelp: Unlikely to be useful. Food source? Reduced Maintainence?
Psychic Anglerfish: Potential Telepathy power?
Glory-Aquila: Some morale bonus?
Banshee Quail: Telepathy attack power? Adaptable to megasound blasters?
Dragonfruit: Aerial bonii, potentially.
Mirage Palm, Camo Croc: Probable stealth or defences bonii.
Giant Mosquito: Anti-stealth technology, superior anticult from better capturing abilities? Assisting medical tech due to better blood drawing techniques? (not seeing much here)
Razograss, Cannibal Grass: Potent anti-infantry technology (Mostly in improving our defences against any chaff.)
Helljackal: Probably leads to either better materials or a Rage telepathy power. (Useful vs Abomination)
Raptor: Likely leads improvements to light units, their speed might lend insights to improve our aircraft?
One problem might be that we zero-ed in on the best creatures to research, and the remaining are.. not the best research targets. The omakes have quite some which are detailed somewhat.
@Durin
Some updating on Mechanicus/Biologis section: Titan Scorpion isn't there. The research is from
here, for convenience.
Needs removing from not yet researched under Biologis:
Dragon Turtles
Calming Butcher Bird
Psyrodactyls
Nog
Titan Scorpions