Technical Abstract: Pigment biomarkers are extremely useful for characterizing algal populations. For maximal utility, these biomarkers should be unique compounds found within specific divisions or lower taxonomic rankings. A unique pigmented compound was isolated from select species from eight genera of euglenoids representing all of the major photosynthetic lineages. The compound does not match the published absorbance or atomic mass for pigments found in this division. This novel compound, currently thought to be a carotenoid and tentatively named euglenophycin, has a maximal absorbance at 464nm in acetone, and a mass weight of 519-520 AMU and appears to have utility in separating euglenophytes from the chlorophytes.