Abstract
Chrysochromulina quadrikonta (Prymnesiophyceae), a quadriflagellate species previously unrecorded in New Zealand, was isolated from Nelson Harbour, New Zealand, in autumn 1991. It bears unmineralized plate and spine scales, which morphologically are most like those of Chrysochromulina ericina . Chrysochromulina quadrikonta, Chrysochromulina camella (isolated from the Marlborough Sounds, New Zealand) and Chrysochromulina polylepis (an ichthyotoxic species originally isolated from Scandinavia) grew most rapidly (growth rates, or divisions per day, of 1.41, 1.49 and 1.43, respectively) when cultured in a seawater-based general-purpose nutrient medium at a salinity of 24% and pH 7.9, with only C.camella still growing at 42% Chrysochromulina quadrikonta and C.camella grew optimally at 25°C. and C.polylepis between 15 and 20°C; only C.polylepis grew at 10°C. Chrysochromulina quadrikonta grew optimally with potassium nitrate and ammonium chloride as nitrogen source, whereas C.camella and C.polylepis grew equally well with urea as nitrogen source. Only C.quadrikonta and C.polylepis had a selenium requirement. Unlike C.polylepis , neither of the New Zealand isolates was phagotrophic nor ichthyotoxic.
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