Plural of ceras; in zoology, the soft finger-like or leaf-like respiratory appendages found on certain marine mollusks like nudibranchs and sea slugs.
From Latin cera (wax), applied to these structures because their appearance resembles waxy protrusions or horn-like extensions.
Sea slugs wave these beautiful cerata like tiny flags while they float through the ocean—scientists named them after wax because they look delicate and malleable, but they're actually crucial breathing organs.
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