Prymnesium kappa

Taxonomy:

Catalog entries: Chrysochromulina kappa

Original description: Motile cells sphaeroidal, showing some metaboly, 4.5-6.5 (exceptionally 4-10.5) µm in diameter. Two flagella and one haptonema arising close together at one pole; the flagella equal, homodynamic, 1.5-2.5 times the cell diameter in length, smooth, shortly mucronate at the tip under the electron microscope; the haptonema a little longer than the flagella when fully extended, with a basal swelling, a club-shaped tip and a translucent sheath visible only with the electron microscope. The periplast covered by very thin transparent sculptured scales visible only with the electron microscope, on any one cell ranging in shape from oval to polygonal and in size from 0 3 x 0.4 µm to 0.5 x 0.8 µm with, at the flagellar pole, a few scales bearing a soft central spine. Cells uninucleate, no stigma. Chromatophores usually 2 or 4, sometimes 1 or none, golden brown; in cells of the motile phase usually saucer-shaped, parietal, with a single globular body (pyrenoid?) placed centrally on the internal face of each; in cells of the non-motile phase deeply lobed or stellate. Oil and leucosin produced. Ejectile muciferous bodies localized in the cytoplasm mainly at the non-flagellar pole. Nutrition holophytic and/or phagotrophic. Not toxic to fish. In the motile phase asexual reproduction of pigmented and non-pigmented cells by fission into 2, 3 or 4 daughter-cells. In the non-motile phase reproduction (asexual?) by successive fission of amoeboid cells to produce 4 daughter-cells with walls; motile phase probably liberated from walled daughter-cells through a pore.

Morphology:

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 (0.00-0.00Ma, base in "Holocene" stage). Data source:

Prymnesium kappa compiled by Jeremy R. Young viewed: 16-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20392 Go to Archive.is to create a permanent copy of this page - citation notes

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