This analysis addresses the classic evolutionary problem: which developed first, conspicuous biological coloration or color vision? Reviewing phylogenetic reconstructions and fossil evidence (a necessarily uncertain methodology, as far as I can tell), scientists estimated the timelines for four key uses of conspicuous color—mating, warning (aposematism), attracting pollinators (flowers), and attracting dispersers (fruits)—against the origin of color vision itself. The data strongly suggests that color vision evolved first, approximately 550 million years ago in arthropod ancestors, preceding the oldest dated conspicuous coloration (fruit/seed dispersal) by over 200 million years. The initial evolutionary utility of color vision was likely for general environmental stabilization and navigation in naturally colorful, high-contrast environments, rather than for decoding novel biological signals.
Evolutionary Sequence of Color and Color Vision
0:47 Color Mechanics: Color is generated either chemically (pigments like carotenoids in flamingos) or structurally (microscopic shapes creating blues/iridescence, like in butterflies). Perception relies on photo receptors, light-sensitive opsins, and brain processing.
2:29 Function: Conspicuous color primarily functions as a signal (e.g., mating, warning, or camouflage).
3:10 Research Premise: Two evolutionary biologists sought to sequence the origins of conspicuous (stand-out) colors, testing hypotheses related to fruit, flowers, warning, and mating, against the hypothesis that color vision evolved first.
4:31 Epistemic State: Phylogenetic reconstruction, the primary method used, is limited and highly uncertain, especially when tracking traits far back in time. Fossil evidence for color is sparse, making dates speculative.
10:24 Color Vision (The Winner): Color vision is the oldest trait, estimated to have evolved around 550 million years ago (Mya) in an arthropod ancestor (550–500 Mya). This predates all purpose-driven conspicuous coloration events.
9:57 Oldest Conspicuous Coloration (Purpose-Driven): Bright, fruit-like flesh on gymnosperms for seed dispersal dates back to the late Carboniferous period, 307–299 Mya. Angiosperm fruits date to 200–250 Mya.
9:10 Flower Coloration: Conspicuous colors in flowering plants (angiosperms) to attract specialized pollinators appeared around 200 Mya.
8:04 Warning Coloration (Aposematism): This developed later, reliably dated to around 130 Mya (e.g., ancient Lebanese cockroach). A highly speculative Cambrian claim (500 Mya) for iridescence as a warning sign is dismissed by the authors.
6:33 Mating Coloration: This is the most recent, appearing widely in arthropods and chordates around 100 Mya. An outlier feathered dinosaur, Ankoris (160 Mya), suggests transient earlier examples.
12:14 Utility of Early Vision: Color vision likely did not evolve to see biological signals initially. Instead, it may have evolved for general object recognition or, specifically, to filter and stabilize chaotic visual noise (e.g., high-contrast flickering patterns in shallow marine water) that would otherwise confuse primitive visual systems.