"Evolsaur", known as "Evolder" (エヴォルダー Evorudā) in the OCG is an "Evol" sub-archetype consisting of FIREDinosaurmonsters. They are the second stage of evolution, being evolved from Reptile "Evoltiles" and evolving into Dragon "Evolzars". Its English name is a combination of evolution and dinosaur.
Their pictures have some sort of molecule in the background.
It is likely an artistic imagining of a nucleic acid, since it bears resemblance to bases and a sugar phosphate-like backbone. Interestingly, the bases don't correspond to any natural bases, the phosphate-like groups are not true phsophates and the many of the Nitrogen atoms have too many bonds, and would not be stable structures.
Their pictures also have a depiction of the evolution of man in the lower right corner.
Their Japanese name, Evolder is spelled in a way that sounds a lot like "Evoluder", a fictional term for a human being that's evolved beyond humanity from the anime "Yuusha-Oh GaoGaiGar".
So far, "Evolsaur Lios" is the only "Evolsaur" Monster that doesn't need to be Special Summoned by the effect of an "Evoltile" monster in order to activate its effects.
