Figure 6.

Detail of the specimen formerly designated as the paratype of H. quadriformis by [29] and compared to Mamsetia manunis gen. et sp. nov. herein: longitudinal muscle of the arm (a) is highlighted in orange—note that there is only one arm at the corner of the calyx, not 2 as in the holotype of H. quadriformis. The preserved portion of circular/coronal muscle (com) of the oral surface is more complete than in stauromedusae, but comparable to the oral surface of stauropolyps. Note the smooth area above the arm (arrowed), which was interpreted as a basal disc previously. Scale bar 1 cm.