Differs from all other holasteroids in having an ethmophract apical disc (i.e. the four genital plates abut and are not separated into anterior and posterior pairs by ocular plates II and IV). The plastron plating shows that this taxon is a hemipneustid and not a spatangoid. Hemipneustes is most similar in petal structure and plastron plating. The species Hemipneustes jullieni is the immediate sister group to Medjesia, as in this species one of the pair of lateral ocular plates is exsert.
Jeffery, C. H. 1997. Revision of the echinoid Enallopneustes from the Upper Cretaceous of North Africa. Cretaceous Research 18, 237-248.