Cidaroida
plural noun
Cid·a·roi·da
ˌsidəˈrȯidə
: the oldest surviving order of sea urchins containing the most primitive of living forms, all lacking peristomial gills and sphaeridia but having an apically located anus see cidaridae
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“Cidaroida.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Cidaroida. Accessed 28 Nov. 2024.
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