How do subsections of zoology work? Are they elite classes obtainable only by someone with zoology levels? Subcalsses? If so how do you handle further specialization, like an entomologist who specializes in ants?
My gosh so sorry being so late with the reply!
 Like the fool that I am I picked up more projects after making this one and I forgot about this and got lost.
So before I get into zoology, I'm going to try to explain my half baked game mechanics of how skills and classes work. My apologies also if I switch back and forth between terminology, such as Class = Science = Field of study or Discipline = Skills or Skill specialization.
 I also just noticed I put Zoology as a required field for summoning the Salmon Shark, which I don't think really works anymore, I'd rather just use Biology at the moment.
What determines classes is mostly skill ratios that effect certain move proficiencies and allow one to change from one class to another.
Units below a certain threshold at the start of the game (say, below lv 10) are classified as students.
 After overcoming a certain threshold (for now say max skill level) for a skill, that skill get added to their skill ratio pool. So for a unit to become a Marine Biologist, you need to reach your max level in Biology & Hydrology.
By maxing out that unit's Hydrology, you become a hydrologist. Following that, maxing out the Biology skill level the unit will get the option to add Biology to their skill ratio and become a Marine Biologist. The cost of which is halving their proficiency in hydrology. 50% Hydrology , 50% Biology. Each specialization equals 100%, as the scientist can only hold onto so much info at a time.
How skill ratios change and how units change class are currently undetermined, but at the moment
 I'd like them to involve battling (debating?) alongside allies and defeating certain enemies like EV's in Pokémon (my main exposure to RPG's are Pokémon, Fire Emblem and Baldur's' Gate so I'm aware how these mechanics are laid out might be scuffed from the norm).
Now onto Zoology and other Biology classes.
The specializations of Zoology are all treated as a equal subsections of Biology (including Zoology itself).
Biologist that study extant, land based macro-organisms don't need specific specializations mostly because creating classes, moves and abilities for a myriad of specific clades don't seem feasible in a video game setting about various kinds of science, although for a Tumblr setting (I might make exceptions here and there because I'm somewhat making this up as I go and forget stuff sometimes.)
So you've got the three "default" biologist that broadly study extant, land based Eukaryotic Phyla.
   Zoologist, Botanist, Mycologist
(I don't really know atm what would determine someone becoming a Zoologist vs Mycologist as they would probably have the same skill ratios as each other).
Power wise they'd ideally be on-par with the more specialised classes, and be more desirable in certain circumstances. The biologist that are more specialized are so because they require more discipline in other fields to study their subjects.
 So to study Marine Biology, you're going to require hydrology since the most of the biology in which that scientist studies is evolved for life engulfed in ocean water.
A Palaeontologist is going to need Geology because they need to know about taphonomy and similar geologic forces.
A microbiologist is going to require more chemistry since the lifeforms they're studying directly interact with molecular forces more often and use similar equipment as chemist.
Theses scientist classes are usually summoners that let said organisms attack or defend or support for their team. (Marine/Paleo/Zoologist = Attack orientated with varying stat spread trends, Botanist = Wall/Defenders, Micro/Mycologist = Passive ongoing support).  These aren't strict rules but are more the general trends for each kind of summon.
And that's about all I got so far. Sorry if this answer is disappointing or confusing.
 Like I've said, things aren't really set in stone and this is just a little side project for fun. I haven't forgotten about this, I'm just distracted and lazy depressed at the moment and am putting my energy into other things. I'll still be making post on here in the future!
 That being said if you or anyone has got better ideas, want to make your own rules or just go on with your own take on the science rpg idea, that's totally fine with me! I just wanted be a bit creative and get people invested in science in a fun, gamey way!
