Late Precambrian scyphozoan medusaMawsonites randellensissp. nov. and its significance in the Ediacara metazoan assemblage, South Australia

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Abstract
Ediacara metazoan assemblage, Ediacara Range, South Australia. The size and morphological complexity of this species are apparently of the scyphozoan grade. The characteristic three major zones and deeply cleft marginal lappets of this fossil form are similar to those of the living Coronatae but pedalia are not developed. This new species sheds significant light on the previously enigmatic Mawsonites Glaessner & Wade, and provides the basis for the erection of the Family Mawsonitidae under ?Order Coronatae. The present study confirms the fairly advanced evolutionary grade reached by medusae during Late Precambrian time (the Ediacaran or Ediacarian Period).