Haven't drawn them yet, but I'm working on a fishy species that live on the planet Xiphactinus and its moon, Gillicus. Xiphactinus is a mostly water planet with sparse islands and continents, and Gillicus is Space Britain™. Instead of a hemospectrum Xiphactians and Gillicans dislike each other despite being the same species. Xiphactians just thing that living on a land-based celestial body is for wimps, and vice versa. They also get colonized by some trolls. Figures.

I have a drawing of the planet itself, though.