Katdir

-Homeworld: Shelit
-Group: Reptilia.
-Average height, weight and lifespan: 4.8 feet, 160 pounds, up to 120 years.
-Home system government: Katdir Republic (representative democracy).
-Total population: 40 billion.
-Racial slurs: newts, split-jaws, jawless freaks, wetskins.
-The katdir are the most unremarkable species in the Confederation, save for the fact that they're the only amphibians with a senator in the Confederal Senate. That, and the high number of katdir swimmers, but it's to be expected from amphibians.

Nifog
-Homeworld: Gasrda.
-Group: Avian.
-Average height, weight and lifespan: 7 feet, 140 pounds, up to 160 years.
-Home system government: Nifog Clans (assembly of clans).
-Total population: 40 billion.
-Racial slurs: toothy birds, featherfracks, turkeys, feathered lizards.
-The nifogs are the species most non-ninfog Confederal citizens imagine on their heads when they think of strikecraft and dropship pilots and ship commanders. Despite being quite literally flightless birds, most nifogs that man vehicles are superb pilots thanks to their 'native' training in their homeworld, Gasrda, which is among the very few worlds with floating islands and continents. This forced the ancestors of the nifog to develop air travel earlier at the same time they reached the Reinaissance Age, much sooner than all the other species.

Nivac
-Homeworld: Raht.
-Group: Reptilia.
-Average height, weight and lifespan: 5 feet, 220 pounds, up to 400 years.
-Home system government: Nivac Republic.
-Total population: 30 billion.
-Species traits: nivacs are the speciest with the third longest lifespan, industrious in the fields of engineering, and despite their size they're actually stronger than humans thanks to the heavier gravity of Raht. They are, however, a very sedentary species, and average swimmers at best: they can stay underwater for more than two hours, but they can't actually swim, but walk in the seafloor just like hippos on Terra.
-Racial slurs: turtles, tortles, tortis, shellers.
-Nivacs, just like the turtles they look like, are longlived, slow, sure and confident, but while they're difficult to anger, if pissed, they never forgive. By extension, most nivacs that become bounty-hunters become head-hunters and hunt down those that wronged them.

Othilad
-Homeworld: Geotiin.
b]-Group: Arthropoids.
-Average height, weight and lifespan: 7 feet, 100 pounds, up to 60 years.
-Home system government: Othilad Monarchy (elective monarchy).
-Total population: 40 billion.
-Species traits: othilad are very fast on their feet, possess four hands that make them naturally dexterous in many fields, and are able to withstand extreme heat, but there are the shortest lived core species of the Confederation with a maximum lifespan of 60 years, and despite what many think about them they don't breed very fast.
-Racial slurs: bugs, worms, buggers, rachnids.
-At first glance, the othilad look like the stereotypical insect species: monarcy aligned, utterly alien in appearance, and unable to speak the lingua franca of the Confederation. That's when the 'alien' part ends: their monarchs are chosen, not succeeded; they have feelings just like any other species of the Confdereation, and while their mouth parts don't allow them to speak common they can still speak a few languages, and even then they can just use translators. At first many species didn't like them for the simple fact that they were essentially bugs, but with time the Othilad monarchy became one of the most respected members of the coalition.

Therawyrms
-Homeworld: Kharan.
-Group: Synapsida.
-Average height, weight and lifespan: 6.5 feet tall, 330 pounds, 1500 years.
-Home system government: Clans of Kharan (assembly of clans).
-Total population: 11 billion.
-Species traits: therawyrms are physically very strong (able to lift ten times their own body weight) and tough (their scaled skin can deflect small-caliber bullets at a distance and withstand red-grade lasers from pistols and carbines) thanks to the very heavy gravity of Kharan, and theirs is the longest lifespan of any known species in the Milky Way; in fact, there are five known therawyrms that were born before their uplifting by the Zaurak Principate. However, they're quite quarrelsome due to their warrior culture, many find them intimidating, they're slow on their feet and reflexes unless they train heavily, and as the single synapsid sophonts of the Confederation many think they're unnatural. Also, because of their clan-based mentality and aggressivity, they're lumped with zoclaps as the 'Barbarians' of the Confederation, a title of which they happily approve. Finally, there's their birth rate, the lowest of the Confdereation, with only one child born from a married couple, three at the very most, and twins are very rare, with triplets practically nonexistant.
That said, they're also proud of the Confederation and many serve on it as heavy infantry, the only sub-branch they can join.
As a last note, many think they don't deserve their spot in the Confederate Senate due to their uplifting by the Principate, despite their service in the Fronts and their utter loyalty to the Confederation.
-Slurs: lizards, hot-blooded reptiles, titty scalies, geezers. Dragon is meant to be a compliment for just like for reptilians, but it can be used as an insult too.
-Most of the important information on therawyrms has been previously mentioned in their 'Species traits' section, but there's a part that doesn't fit there: the Hegemony War. Before the war, therawyrm population surpassed thirty billion individuals, but after the Treaty there little more than ten, and even after the baby boom their population hasn't recovered from the losses, and by comparison they suffered the most deaths of all species involved in the war. Hence their extreme hatred for anything Hegemony related.

Zaurak
-Homeworld: Krynn.
-Group: Reptilia.
-Average height, weight and lifespan: 5.8 feet, 120 pounds, 200 years.
-Home system government: Zaurak Principate (plutocratic oligarchy).
-Total population: 15 billion.
-Species traits: zauraks are shrewd salesmen and very talented in most fields thanks to the thorough education system of the Principate, but planets within the oligarchy's direct sphere of influence population might seem desolated of plant life due to their lack of frugality, and their tendence to uplift species that, while not completely primitive (they always make sure to uplift those that have harnessed the power of atom), shouldn't be introduced to certain technologies too fast, like the therawyrm.
-Racial slurs: lizards, newts, hornies.
-Zauraks are possibly the most pacifist species of the Milky Way, never wanting to start a fight and only fighting when all other options are impossible. It's not a racial thing though: the Zaurak Principate believes that, in order to help other, less advanced species to progress, they have to be genuinely non-threatening to them. The oligarchy's tendency to uplift primitive civilizations has caused problems for them, but they always point out that hadn't they uplifted therawyrms and zoclaps, the Confederation would have been destroyed (or at least severely weakened) a long time ago.

Zoklaps.
-Homeworld: Aega.
-Group: Mammalia (humanoid subgroup).
-Average height, weight and lifespan: 15 feet, 3500 pounds, 150 years.
-Home system government: Zoklap Tzak (league, direct democracy).
-Total population: 10 billion.
-Species traits: zoklaps are the physically strongest species of the Confederation, able to lift five times their own weight (pound by pound therawyrm are stronger, but zoklaps are ten times as heavy), and they're big enough to shrug small arms fire to some point (rifle-sized kinetics and blue-grade lasers), and they're very united as a species due to their traditions, but because to their single eye their depth perception is pretty poor, and most other species fear them for their size, and in war their size leaves them at extreme disadvantage, since they're too big for normal transports and small cover and a perfect target, although the make great snipers.
-Racial slurs: cyclops, Willies, ogres, wun-wuns, monoeyes.
-There's really nothing else to say about zoklaps, other than they're limited to heavy infantry when enlisted because of their size

MERRY CHRISTMAS TO EVERYONE FROM SPAIN!

Here's the second half of the Interlude about the main Confederal Species. Sorry for those of you who expected the next full chapter, I'm also in Spacebattles Forum (Stupid The Ork) and still writing my second novel (and hoping that I'll finally manage to publish the first one).

If I don't upload the next chapter before end of the year, HAPPY 2020!