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CATALOG - Chrysoculter

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Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Chrysoculter rhomboideus Nakayama, Yoshida, Noël, Kawachi & Inouye 2005
= Chrysoculter rhomboideus

Current identification/main database link: Chrysoculter Nakayama, Yoshida, Noel, Kawachi & Inouye in Nakayama et al. 2005

Compiled data

Citation: Chrysoculter Nakayama, et al. 2005
taxonomic rank: Genus
Farinacci catalog page (& compiler): n/a
Current citation: Chrysoculter Nakayama, Yoshida, Noel, Kawachi & Inouye in Nakayama et al. 2005

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.

The generic name refers to the colour and unique asymmetrical cell shape (chryso = golden, culter = knife)

Editors' Notes
The same description was gven for the genus and the single species included in it.


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: Catalog entry compiled by Jeremy Young. Viewed: 6-12-2023

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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