From Ithone + -oidea.
"ithonioidea." YourDictionary, n.d. Web. 19 January 2019. <https://www.yourdictionary.com/Ithonioidea>.
ithonioidea. (n.d.). Retrieved January 19th, 2019, from https://www.yourdictionary.com/Ithonioidea
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