Besides the before mentioned fenestra, the parietals also have a "postparietal fenestra", something rarely seen outside of Dicraeosauridae. A triradiate postorbital bone is present in Europasaurus, which evolved as the fusion of the postfrontal and postosbital bone of more basal taxa. Between the anterior and ventrally projecting processes the postorbital forms the margin of the orbit, and between the posterior and ventral processes it borders the infratemporal fenestra.
In addition to the previously mentioned window, the parietals also feature a "postparietal window", a rare occurrence outside of Dicraeosauridae. Europasaurus possesses a triradiate postorbital bone, which developed from the fusion of the postfrontal and postosbital bones in more primitive species. The postorbital forms the edge of the orbit between its anterior and ventrally projecting parts, while it borders the infratemporal window between its posterior and ventral parts.