Differs from Macropneustes in having aligned primary aboral interambulacral tubercles. Originally distinguished because of its supposed lack of subanal fasciole. Yet the type specimen shows traces of a subanal fasciole on plate 4 beneath the periproct. Fourtau (1904, p. 609) also stated that although the first specimen showed no trace of a subanal fasciole, other specimens do and that it is definitely present. Fourtaunia seems not to differ in any significant way.
Gauthier, in Fourtau, R. 1899. Revision des echinides fossiles de l\'Egypte. Memoires de l\'Institut egyptien, fasc. 8, serie 3, p. 678-681, pl. 2, figs 5, 6.
Fourtau, R. 1905. Sur quelques "spatangidae" de l\'Eocene d\'Egypte. Comptes Rendu des Association francaise pour l\'avancement des Sciences. 33 session, Grenoble, 1904, 602-613.