Key feature (diagnosis): S. radiata produces a trace in which a single stalked swelling serves as a point of departure of hyphal tunnels exiting from the body of the sporangial swelling. Solitary occurrences have been observed in early Tertiary fossils, which remain the basis of this formal trace description (GOLUBIC et al., 2005, fig. 1d). However, we have observed the same morphotype as part of the development of the trace S. velum, as described above and S. guttulata (WISSHAK et al., 2018, figs. 2f–h; 3b, c). Thus, it is possible that this morphotype expresses similar function and strategy in different Saccomorpha-type traces or might even been part of the developmental sequence of S. velum.