Hemiasteridae Clark 1917
Common Name: Heart urchin
Key morphological features: Test shape is slightly elongated into a heart shape with well developed petals on the surface.
FEEDING MODE: Detritivore
Fell, H. B. and Pawson, L. P., 1966. Systematic Descriptions, in R. C. Moore ed., Treatise on Invertebrate Paleontology, Part U, Echinodermata 3, Volume 2. The University of Kansas and Geological Society of America. 695 pp.