"Kitefin sharks (Dalatias licha) have been known about since the 18th century, but it was only in January 2020 that scientists saw them glowing in the dark for the first time. They are not the only bioluminescent sharks – roughly one in 10 species has that ability – but at up to 1.8 metres, kitefins are by far the biggest that have been found."

https://www.theguardian.com/environment/2022/nov/09/discovered-in-the-deep-the-sharks-that-glow-in-the-dark