Gonyaulax catanella Gon·y·au·lax cat·a·nel·la (gŏn'ē-ô'lāks' kāt'ə-něl'ə)
n.
A marine dinoflagellate protozoan that produces a powerful toxin that accumulates in the tissues of mussels and other filter-feeding shellfish; it may cause fatal poisoning in humans who have eaten contaminated shellfish.