Science, Space and Technology News 2024
Scientists have discovered an ancient sponge species, Helicolocellus, in China, dating back 550 million years, offering new insights into sponge evolution and filling a crucial gap in their early fossil record. Reconstructed life position of Helicolocellus on Ediacaran seafloor. Credit: Yuan Xunlai
Phylogenetic position of Helicolocellus. Helicolocellus is resolved as a stem-group hexactinellid along with other fossil sponges. Credit: Yuan XunlaiTwo competing hypotheses have been proposed to explain the absence of Precambrian sponges: One hypothesis holds that, since most extant sponges have siliceous or calcareous spicules, the common ancestor of sponges also had mineralized spicules.
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