From The Scyphozoan
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Characteristics of the family (from Bayha & Dawson 2010)
Semaeostome with eight rhopalia in deep niches of the subumbrella away from the bell margin; tentacles within an annular zone of the subumbrella delimited proximally by the manubrium and distally by the radius to the rhopalia; gastrovascular cavity consists of radial pockets, separated by gastric mesenteries, which bifurcate numerous times toward the bell margin; ring canal absent.