Sapthadiids are colorless, but as you can see here, they sometimes take on a green coloring. That's not their own pigments, though they take on the verdant hue thanks to algae that have either taken up residence as a symbiant, or that have had the misfortune to be eaten. In some cases, you can also see bright, shimmering lights glowing from within. Some of those are crystalline part of the organism, while others are sugars that refract beautifully under our microscope's light. To hunt down their food, Sapthadiids rely on the toxicysts lining their mouths to immobilize their prey. And from there some species will swallow their meals whole, while others will use chemicals released by their toxicysts to mash their meals up outside their body like a little protist smoothie they can just slurp up.