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Gymnophthalmata
Gymnophthalmata Gym`noph*thal"ma*ta, n. pl. [NL., fr. Gr.
gymno`s naked + ? the eye.] (Zo["o]l.)
A group of acalephs, including the naked-eyed medus[ae]; the
hydromedus[ae]. Most of them are known to be the
free-swimming progeny (gonophores) of hydroids.
Meaning of Gymnophthalmata from wikipedia