Image of the holotype. The test resembles that of the species
E. crispum, but is distinguished by the prominent umbilical boss (the smooth "knob" at center left). Image courtesy of David B. Scott, Dalhousie University. This image was originally published in
Palaeologica Electronica, vol. 3, issue 2, and is used with the kind permission of that journal and the Paleontological Association.