A genus of single-celled marine organisms without a rigid outer shell that can move around and sometimes produce light or toxins.
From Greek 'gymnos' (naked) + 'dinos' (spinning, whirling). Named to reflect the organism's naked appearance and characteristic spinning motion through water.
Gymnodinium species are the culprits behind harmful algal blooms called 'red tides' that can kill fish and contaminate shellfish—but some species also create the magical bioluminescence in ocean waves!
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