When paleontologist Dr. Aaron Hunter first examined the two weathered slabs of rock from Saint-Joachim Quarry in Québec, he wasn’t expecting to see feet—certainly not 452 million-year-old ones. Yet there they were: delicate, feather-like impressions of tube feet belonging to Dendrocrinus simcoensis, an ancient sea lily that swayed in Ordovician seas long before dinosaurs walked the Earth. These fragile structures, preserved as thin films of pyrite, represent the oldest known fossilized tube feet ever discovered—offering an unprecedented glimpse into the soft anatomy of creatures whose skeletons have long been familiar, but whose lives have remained largely mysterious.
Echinoderms like starfish and sea urchins rely on tube feet for everything from feeding to sensing their environment, but such soft tissues almost never survive fossilization. Until now, only one other example of fossilized crinoid tube feet had ever been documented—making this discovery not just rare, but revolutionary. Found in the Neuville Lagerstätte, a site renowned for exceptional preservation, the D. simcoensis specimens open a new window into how early marine animals interacted with their world.
The details are striking: each tube foot measures just 0.41 mm in length—shorter than those of most modern and fossil crinoids—and spaced at a density of about four per millimeter. Each arm plate supported two pairs of these stubby appendages, a configuration unseen in living species. In contrast, the only other known fossil tube feet, from the much younger Devonian period, stretch up to 7.0 mm long and are spaced far more sparsely—just 0.3 per millimeter. Modern crinoids typically have between 4.59 and 9.49 tube feet per millimeter, with lengths reaching over 2 mm. This new find reveals that ancient crinoids exhibited far greater variation in tube foot design than their modern descendants, suggesting a wider range of ecological strategies.
That variation may hold clues to how D. simcoensis fed. With short but widely spaced tube feet, researchers believe the sea lily likely held its arms in a cone-like or multidirectional posture, rather than the flat, fan-shaped orientation often assumed for stalked crinoids. This could mean it captured food particles from multiple angles in a dynamic water column—perhaps adapting to a specific niche in its shallow marine habitat. Such insights help reconstruct not just individual species, but entire ancient ecosystems.
"Each discovery of these structures in the fossil record has revealed new information on ancient echinoderms," the research team writes, and this one is no exception. As rare as soft-tissue fossils are, this find underscores how much more there is to learn from the deep past—not just about what creatures lived, but how they lived. And in a quarry just outside Québec City, a pair of ancient feet has finally given us a step in the right direction.