Nannotax3 - ntax_non_cocco - Chrysoculter rhomboideus Nannotax3 - ntax_non_cocco - Chrysoculter rhomboideus

Chrysoculter rhomboideus

Classification: ntax_non_cocco -> Haptophytes -> Prymnesiales -> Genera incertae sedis -> Chrysoculter -> Chrysoculter rhomboideus
Sister taxa: C. rhomboideus


Citation: Chrysoculter rhomboideus Nakayama, Yoshida, Noël, Kawachi & Inouye 2005
Rank: Species
Basionym: Chrysoculter rhomboideus Nakayama, Yoshida, Noël, Kawachi & Inouye 2005
Taxonomic discussion: This is clearly a different species to Navisolenia aprilei, as it has significanelty smaller and less eleongated scales; but probably should be recombined in Navisolenia. Nakayama et al. (2005) do not discuss Navisolenia so may have overlooked it when creating the genus Chrysoculter

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. gs


Chrysoculter rhomboideus compiled by Jeremy R. Young viewed: 29-9-2023

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