Cooke (1959) described Unifascia as having a marginal fasciole, because it passes around the ambitus in the anterior part of the test and is removed from the ends of the petals. However, the fasciole passes between the periproct and apical system and is thus a hybrid semipetalous and marginal fasciole. It differs from Prenaster in lacking the lateroanal portion of the marginal fasciole and in having heterogeneous aboral tuberculation.
Cooke, C. W. 1959. Cenozoic echinoids of Eastern United States. United States Geological Survey Professional Paper 321, 1-103, pls 1-43.
Kier, P. M. 1980. The echinoids of the Middle Eocene Warley Hill Formation, Santee Limestone, and Castle Hayne Limestone of North and South Carolina. Smithsonian Contributions to Paleobiology 39, 1-102.