For my newest pet, Occultation. He's an Eclipse pet ;D (Using the Astonomy term of occultation, it refers to eclipses as well as anytime an astral body moves in front of another).
I have not yet settled on what species or color he should be, though. Anything that brings to mind an eclipse will work; I just need a starting point. His current species is a Noktoa.
I don't have access to a list of colors at this current point in time, but off the top of my head I would think that either a Nightmare, Galactic, or a Reborn color would suit an eclipse-themed pet very nicely!
I would go for either a Galactic or Storm pet. Species is more difficult. Do you have a favourite or does the pet need certain other characteristics?
I do, buuuuut I kind of wanna branch out a bit xD. I definitely ruled out Dilemma though, as I don't think it'd be very fitting.
I'd definitely suggest Galactic

or maaaybe Reborn.
I agree with that the Noktoa and Anyu would be a good fit! Other than that, what about Galactic Popoko, Legeica or Mahar? I do not know how to link pictures, so bear with me, but the Storm Jollin and Cadogre would be fitting as well. Although I seem to be the only one who thinks Storm is a good colour for this. :)
I personally like the Jollin. It has a moon behind it. Also, what about the Devonti?

I do love the Devonti. The Jollin is a good choice (buuut I already have one xD)
Oh yeah, the Popoko could be great! I considered Storm as a color, but I didn't think it really worked all that well. I'm almost leaning more toward the Noktoa or Devonti in Galactic Or a serpenth in Galactic or Reborn.