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https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html
Shark evolution: a 450 million year timeline | Natural History Museum
Sharks have survived five mass extinctions. Discover what the first sharks were, when the megalodon first appeared, and how this group of fishes changed over...
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https://www.popsci.com/science/jellyfish-ancestor-fossil-canada/
450-million year old jellyfish ancestor looks like a flailing carwash tubeman | Popular Science
Apr 20, 2026 - ‘Paleocanna tentaculum’ was more closely related to today’s marine invertebrates than its prehistoric relatives.
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https://www.sci.news/paleontology/paleocanna-tentaculum-14711.html
450-Million-Year-Old Fossils Reveal Strange, Tube-Dwelling Jellyfish Relative | Sci.News
Apr 21, 2026 - Paleontologists have identified a new genus and species of soft-bodied, tubicolous polyp medusozoan from well-preserved specimens found about 50 km northeast...
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