This was a fun alien species I created a while back but put SO much work into. it's not really all of them either... Just the basic ones. There's even a bit of lore to go along with it. A picture's only about as good as it's context, so I'll just summarize what they're like...

from a planet named Cencodae, Tunsluas are a hexapedal (each of those nubs are legs.) psuedo-aquatic race of genderless, slug-like aliens known for their decievingly large tongue, and lesser known for their acidic sticky slime that is essentially their waste, but melted into an unrecognizable odor-less (at least to humans it's odorless, not to Tunsluas) slime. Their tongues, while not noticeable on the surface, actually wraps around their innards... They reproduce by excreting slime from their back/dark side onto another Tunslua's light/belly side... and that tunslua choosing either to make multiple eggs/harbor only one inside like a mammal allowing it to develop a bit further than egg-grown ones/or grow one with their memories, essentially reincarnating themselves.
They live in a royal eusocial caste society... even with the whole "inbreeding" thing... Except they are much more equip to weed out the defects as their genes recombine DAILY to circumvent this. Meaning technically anyone in a Kingdom is royal blood, just not literally.. Unlike Bees, Queens are born different from a normal worker... but like bees, they're main purpose is breeding.. which isn't hard for tunsluas where to do it all that's necessary is basic contact and one to allow it. Aside from that still grisly topic, Every Tunslua has a certain class and with it a duty....that I'm running out of reasonable space to explain.

Notes: I sort of made this because I wanted a less anthro species that actually had some lore behind it... Like something that didn't need just two legs to stand out on it's own. I know this is probably a flop, but I wanted something that wasn't just another two-legged anthro-species.
The third one is actually in a happy expression, it just looks angry compared to us.
That 4th one is literally just a baby. And age wise the rest are between 1 year to 20, while the last one is under 3 months.
That purple/dark side doesn't change, along with the color of their "horns" (actually what they respirate through)
They live in the acid oceans of their home planet, and have very high tolerance to acid. They could even sustain Fluoroantimonic Acid without dissolving... however they couldn't survive in it because there'd be no food.
What you see as those fluffy bits on the back of their head are more like many, MANY long ears-like parts then hair... Which also means their infants are pretty much deaf until it grows in.
Tunsluas were inspired by mollusks and axolotls... not related in any way, but surely inspired.