It differs from all other Pedinoida in having simple ambulacral plating throughout. It differs from all Triadocidaridae except for Vinchuscanchaia in having perforate tubercles at the ambitus and adapically. Vinchuscanchaia differs in having proportionally smaller mamelons to its primary tubercles which are surrounded by a distinct smooth platform. Triadocidaris is similar but has imperforate tuberculation adorally. Resembles cidaroid echinoids in appearance, but lacks apophyses internally. This appears to be the oldest known euechinoid with distinct auricles.
Compared to the type species, Z. regularis has better developed peg-like auricles, more obvious ambulacral plate compounding adorally and its apical disc is demonstrably dicyclic. It is possibly a pedinoid. Whether the other members are pedinoids or stem group euechinoids requires more complete material.
Kier, P.M. 1977. Triassic echinoids. Smithsonian Contributions to Paleobiology 30, 1-88.
Smith, A. B. (1994) Triassic echinoids from Peru. Palaeontographica A 233, 177-202.