Nannotax3 - ntax_Farinacci - Chrysochromulina throndsenii

CATALOG - Chrysochromulina throndsenii

Folder trail: ntax_Farinacci -> Haptophytes -> Chrysochromulina -> Chrysochromulina throndsenii
Folders this level: << < C. parva, C. pelagica, C. planisquama, C. polylepis, C. pontica, C. pringsheimii, C. pseudolanceolata, C. pyramidosa, C. quadrikonta, C. rotalis, C. scutellum, C. simplex, C. strobilus, C. tenuispina, C. tenuisquama, C. throndsenii, C. vexillifera

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.
Taxa are sorted alphabetically for simple browsing, or you can use search boxes at the top & bottom of the page

Current identification/main database link: Chrysochromulina throndsenii Eikrem 1996

Compiled data

Citation: Chrysochromulina throndsenii Eikrem 1996
Rank: Species
Type specimens: HOLOTYPE: Fig. 4
Type locality: Isolated from a serial di­lution culture (Throndsen 1978) inoculated with surface water collected at Aeroy (58°24'N, 8°46'E) just outside Flodevigen, southern Norway on 27 July 1989.
Farinacci catalog page (& compiler): n/a
Current citation: Chrysochromulina throndsenii Eikrem 1996

Original Description

Cells saddle-shaped, about 5-6 µm long and wide. The two flagella equal, about 12 µm. Haptonema length varying from 32 to 50 µm. Two chloroplasts. Cells covered with two types of scale arranged in two layers: those of the inner layer flat, 0.29-0.31 µm in diameter, those of the outer layer 0.31-0.36 µm with an upright rim. The two scale types otherwise iden­ tical. The centre of the scale with a cruciate structure sur­ rounded by an open ring. Approximately 25 ribs radiate from the central ring to the margin, crossed by spiralling ribs.


Named in honour of Professor Jahn Throndsen, University of Oslo.

Extra details from original publication
Description: The saddle-shaped cells normally swim with the haptonema pointing forward and the homodynamic fla­ gella along the side of the cell (Figs I, 2). The appendages are inserted subapically on the somewhat concave side of the cell (Figs I, 2). In live cells, one flagellum shows autoflu­orescence in blue light.

Scales of the inner and outer scale layers are identical, except for the upright rim of the scales comprising the outer layer (Figs 3, 4). The rim measures approximately V3 of the scale diameter. The centre of each scale has a central ring with a cross. Ap­ proximately 25 ribs radiate from the central ring to the periphery. The concentric-like pattern is composed of, typically, two spiralling ribs. Scales with only one spiralling rib can also be found (Fig. 3). The two scale faces are identical.

The cells contain two parietal chloroplasts, each with an immersed pyrenoid. Single tubules penetrate the pyrenoids (Figs 5, 6). In the space between the chloroplast membranes and the chloroplast endoplasmic reticulum, vesicle-like inclu­ sions are observed (Fig. 6). The nucleus is located in the pos­ terior part of the cell. The mitochondrion is probably single and reticulated. The cell has a dictyosome (Fig. 5), known in the Prymnesiophyceae to produce scales. The area just un­ derneath the cell membrane contains a number of vesicles (Figs 5, 7). Membrane-bound inclusions can also be observed in the cytoplasm and sometimes in vesicles just beneath the cell membrane (arrows in Fig. 7). The cells sometimes contain food vacuoles (not illustrated).

The flagellar apparatus has not been studied in detail. It appears to be simple, lacking a compound root. The basal bodies are almost perpendicular to each other and the extend­ ed part of the haptonema has six microtubules (Figs 8, 9).

Editors' Notes


Eikrem, W. (1996). Chrysochromulina throndsenii sp. nov. (Prymnesiophyceae). Description of a new haptophyte flagellate from Norwegian waters. Phycologia. 35: 377-380. gs


Chrysochromulina throndsenii: Catalog entry compiled by Jeremy Young. Viewed: 3-12-2022

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes
Link to WoRMS (World Register of Marine Species)

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics