A stinging-cell structure, composed of a layer of mainly nematocytes surrounding a core of dinoflagellates, amoebocytes and mesoglea, expelled within mucus by Rhizostomeae jellyfish to sting (and in some cases kill) prey in the surrounding water.
Origin
From Cassiopea -some, referring to a genus containing some of the jellyfish found to produce them. Coined 2020 by Cheryl L. Ames, et al., in a paper published in Communications Biology (see quotations below).
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