Abstract

ABSTRACTA description and Latin diagnosis of the new genus and species Pelagococcus subviridis Norris is presented. Pale green, spherical cells appeared in enrichment cultures initiated from water samples collected at stations between 132°W and 175°W and between 45°N and 50°N in the North Pacific Ocean. The alga is placed in the Chrysophyceae based on organelle fine structure, and presence of chlorophylls a and c, diatoxanthin, diadinoxanthin and two fucoxanthin‐like pigments. There are a number of atypical features however; the two fucoxanthin‐like pigments differ from true fucoxanthin; there is only chlorophyll c2 (not C1+ c2); probably mostly a, not β‐carotene; half of the chlorophyll a is in the form of chlorophyllide a.

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