Originally differentiated from Hemiaster because the more adapical pores in the anterior column of its anterior petals were markedly reduced. However, a similar pattern is seen in many Hemiaster species, including H. bufo, the type species. Unfortunately nothing is currently known about its plastron structure and so it can only tentatively be synonymized with Hemiaster.
Gauthier, A. 1887. Description des especes de la Craie de Reims et de quelques especes nouvelles de l'Aube et de l'Yonne. Bulletin de la Societe des Sciences de l'Yonne 41, 367-399, pls 4-8.