Relating to or describing hydrozoans that have a protective covering or sheath around their colonial structure.
From Greek kalyptein (to cover) plus blastikos (relating to budding or growth), creating a compound adjective used in marine biology. The suffix -ic is standard for forming adjectives in scientific terminology.
These delicate creatures live in ocean currents and some can glow in the dark thanks to bioluminescence—their protective covers are so thin you can barely see them, yet they've survived for hundreds of millions of years!
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