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"In the sub-order Rhizostomae the edges of the oral opening use together at an early age and leave several sucker-like secondary mouths, which were formerly mistaken for independent persons." — Encyclopedia Britannica, 1893

Chrysaora

"In the sub-order Rhizostomae the edges of the oral opening use together at an early age and leave several…

"Side view of <em>Amphioxus</em>: fs, fin supports; nc, notochord; ot, oral tentacles."&mdash;Finley, 1917

Side view of lancelet

"Side view of Amphioxus: fs, fin supports; nc, notochord; ot, oral tentacles."—Finley,…

"In the sub-order Rhizostomae the edges of the oral opening use together at an early age and leave several sucker-like secondary mouths, which were formerly mistaken for independent persons." &mdash; Encyclopedia Britannica, 1893

Rhizostomae

"In the sub-order Rhizostomae the edges of the oral opening use together at an early age and leave several…