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Half-billion-year-old sea squirt could push back origins of vertebrates (Marjum Limestone, Utah)
Oxytropidoceras posted a topic in Fossil News
Half-billion-year-old sea squirt could push back origins of vertebrates, including humans Rare fossil “looks like it died yesterday” by Amanda Heidt, Science, July 6, 2023 The open access paper is: Nanglu, K., Lerosey-Aubril, R., Weaver, J.C. et al. A mid-Cambrian tunicate and the deep origin of the ascidiacean body plan. Nature Commun. 14, 3832 (2023). https://doi.org/10.1038/s41467-023-39012-4 Yours, Paul H. -
518 mya in the Cambrian period, a worm like creature named Facivermis ("torch worm") adapted to a tube dwelling lifestyle that lost it's need for it's lower limbs. This article describes how Facivermis is the earliest known animal to lose body parts ('secondary loss'). They also place Facivermis as a Lobopodian. https://www.sciencedaily.com/releases/2020/02/200227114446.htm The journal article can be found here for anyone interested (open access) - https://www.cell.com/current-biology/fulltext/S0960-9822(20)30119-6?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982220301196%3Fshowall%3Dtrue
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