US EditionFour-Eyed Cambrian Fish Fossils Hint at Origins of Vertebrate Pineal Complex
Researchers found fossils showing four camera-type eyes in 518-million-year-old jawless fishes, suggesting complex vision linked to the pineal complex, evolving for predator detection.
- On January 22, 2026, a Nature paper reported myllokunmingids possessed two pairs of camera-type eyes, lateral and median, dating from around 518 million years ago.
- Fossils collected between 2019 and 2024 from the Chengjiang biota preserve soft body parts including eyes, and using SEM and TEM, researchers identified melanin-bearing melanosomes in central structures.
- Microscopy revealed lens impressions and two ovoid, lens-like structures in the median dark spots, suggesting image-forming anatomy that allowed perception of shape and a broad, 'IMAX-style' view.
- The researchers propose the median organs could be precursors to the vertebrate pineal complex, suggesting reduced predation drove degeneration of camera-like median eyes into this light-sensing structure.
- Some paleontologists warn of substantial debate, saying experts must 'see eye to eye', while Karma Nanglu calls for whole-body mapping to exclude taphonomic artefacts, experts and paleontologists note.
21 Articles
21 Articles
Four-eyed Cambrian fish fossils hint at origins of vertebrate pineal complex
New fossil evidence from China suggests that some of our vertebrate ancestors had four eyes. The study, published in Nature, takes a closer look at a structure found in multiple 518 million-year-old fossils, which appears to have the same features of other fossilized eyes, and may be linked to the pineal complex in modern vertebrates.
NewScientist
Anti-Aging, Acupuncture and Health NewsOur earliest vertebrate ancestors may have had four eyes
Extraordinary fossils of 518-million-year-old jawless fish, among the earliest known vertebrates, appear to show that these animals had two pairs of eyes
An eye-popping discovery: early vertebrates had four eyes rather than two
Eyes on a face’s front or side enable a brain to perceive images. Fossil evidence suggests that two light-sensitive organs on top of ancient vertebrate heads generated images, too. Eyes on a face’s front or side enable a brain to perceive images. Fossil evidence suggests that two light-sensitive organs on top of ancient vertebrate heads generated images, too.
Ancient Vertebrate Ancestors: The Surprising Discovery of Four Eyes
Illustration of Haikouichthys, a notable Cambrian fish with fossilized evidence of a second pair of eyes Xiangtong Lei, Sihang Zhang Over 500 million years ago, the earliest known vertebrates exhibited an intriguing feature: an extra eye. Interestingly, humans may retain traces of this ancient evolutionary trait. Significant fossils from two species of jawless fish, known [...] The post Ancient Vertebrate Ancestors: The Surprising Discovery of F…
Coverage Details
Bias Distribution
- 73% of the sources are Center
Factuality
To view factuality data please Upgrade to Premium
