One of the specimens of Saccus xixiangensis, no more than 1 millimeter in diameter. (Liu et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2025)Tiny mineralized spheres are offering fresh insights into the history of life on Earth. These millimeter-sized fossils, over 535 million years old, are the fossilized embryos of early Cambrian animals.Belonging to the Ecdysozoa group—which includes insects,...
A light micrograph of a section through the thorax of a mouse embryo, which shows left–right asymmetry. RIKEN researchers have discovered how cilia detect fluid flow, which eventually leads to this asymmetry. Credit: Dr. Keith Wheeler/Science Photo LibraryThe process through which small hairs in embryos perceive fluid movement has been identified by biologists from...
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