Taxonomy:
Catalog entries: Chrysoculter rhomboideus
Original description: Cells solitary, mostly asymmetric knife-shaped, 10–16 μm long, 3–6 μm wide. Two equal to subequal flagella, 14–26 μm, inserted at the cell apex. Haptonema 4–10 μm, noncoiling. Cells covered by two types of scales. Scales of the inner layer elliptical, 0.35 × 0.18 μm, with a narrow inflexed rim, and a radial pattern. Scales of the outer layer rhomboidal, 1.1 × 0.6 μm, with upright rim (50–80 nm), two projections, and a radial pattern. Rhomboidal scales do not overlap. Two pale yellow chloroplasts, lateral and parietal, are displaced horizontally, each with an immersed pyrenoid. The flagellar transitional region with a terminal transitional plate.
Type images:
Cultures: Strains of this species are maintained in culture, for details see Roscoff Culture Collection.
Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within no known fossil record modern (0-0Ma, base in "Holocene" stage). Data source:
Nakayama, T., Yoshida, M., Noël, M. H., Kawachi, M. & Inouye, I. (2005). Ultrastructure and phylogenetic position of Chrysoculter rhomboideus gen. et sp. nov. (Prymnesiophyceae), a new flagellate haptophyte from Japanese coastal waters. Phycologia. 44(4): 369-383. gsReferences:
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Chrysoculter rhomboideus compiled by Jeremy R. Young viewed: 29-9-2023
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