Science ❯ Paleontology ❯ Fossils
Molluscan Evolution Megacheirans Scalidophora Ecdysozoan Fossils Sirius Passet Lagerstätte Chancelloriids Burgess Shale Grand Canyon Fossils Microscopic Fossils Cephalopod Evolution Salterella Marine Ecosystems Huayuan Biota Cambrian Explosion Megachelicerax cousteaui Animal Diversification Chelicerates Chelicerate Evolution Bryozoan Fossils Urokodia aequalis
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.