Science ❯ Paleontology ❯ Fossils
Megachelicerax cousteaui Chelicerate Evolution Cambrian Explosion Microscopic Fossils Salterella Animal Diversification Burgess Shale Ecdysozoan Fossils Urokodia aequalis Marine Ecosystems Bryozoan Fossils Chelicerates Huayuan Biota Scalidophora Grand Canyon Fossils Megacheirans Molluscan Evolution Sirius Passet Lagerstätte Chancelloriids
High-resolution scans of millimetre-sized shells reveal a ventral segmented tube interpreted as a primitive buoyancy organ that narrows the gap between molecular dates and the fossil record.