Ancient oddball invertebrate finds its place on the tree of life
![illustration of a hyolith](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/011117_CM_hyolith_main.jpg?fit=860%2C460&ssl=1)
Tentacles protruding from this hyolith’s shell (illustrated) are part of a feeding organ called a lophophore, which is also found in modern horseshoe worms.
Danielle Dufault © Royal Ontario Museum