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Rhizostomata
Rhizostomata Rhi`zo*stom"a*ta, n.pl. [NL., fr. Gr. ??? a root
+ ???, ????, a mouth.] (Zo["o]l.)
A suborder of Medus[ae] which includes very large species
without marginal tentacles, but having large mouth lobes
closely united at the edges. See Illust. in Appendix.
Meaning of Rhizostomata from wikipedia