Mastodawn

Here’s the relevant Nature article about specimens from the early vertebrate genera Haikouichthys and Myllokunmingia (and the corresponding Nature news article).

Full preprint published on ResearchGate. Credit for the image is persistently given to Xiangtong Lei and Sihang Zhang, the first two authors listed on the paper.

Four camera-type eyes in the earliest vertebrates from the Cambrian Period - Nature

Early vertebrates, particularly myllokunmingids, possessed four camera-type eyes (a pair of lateral eyes and pineal and parapineal organs), which indicates that these structures functioned in image formation, in support of the hypothesis that the four camera-type eyes represent an ancestral vertebrate trait.

Nature