CATALOG - Pleurochrysis


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Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the 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 compiled by Prof A. Farinacci 1969-1989 and updated by Richard Howe 2000-2016 - see also this page.
Taxa are sorted alphabetically for simple browsing, or you can use search boxes at the top & bottom of the page


Pleurochrysis carterae var. dentata Johansen et al. 1988
= Chrysotila dentata
Pleurochrysis placolithoides Fresnel & Billard, 1991
= Chrysotila placolithoides
Pleurochrysis pseudoroscoffensis Gayral & Fresnel 1983
= Chrysotila roscoffensis
Pleurochrysis scherffelii Pringsheim 1955
= Chrysotila scherffelii


Current identification/main database link: Chrysotila Anand 1936

Compiled data

Citation: Pleurochrysis Pringsheim, 1955
Rank: Family
Type species: Pleurochrysis scherffelii Pringsheim, 1955
Farinacci catalog page (& compiler): n/a
Current citation: Chrysotila Anand 1936


Original Description
Braune Algen, deren Zellen sich in der Mutterhülle teilen und zwei- bis vielzellige, unregelmässig kurz fadenförmig auswachsende Kolonien bilden. Meist zwei Chromatophoren in jeder Zelle. Als Reservestoffe Fett und Chrysose. Die Schwärmer haben zwei lange Geisseln und zwei Chromatophoren mit Pyrenoiden.

Brown algae, the cells of which divide in the mother envelope and form two- to multicellular, irregular, short, thread-like colonies. Usually two chromatophores in each cell. As reserve substances fat and chrysose. The swarmers have two long flagella and two chromatophores with pyrenoids. [translation from Google translate]

Etymology: Wegen der Ähnlichkeit mit Pleurococcus wurde dieser braunen Alge der Gattungsname Pleurochrysis gegeben

Editors' Notes
Gayral & Fresnel (1983) gave an important emeded diagnosis folowing their study of life-cycles:


Pleurochrysis Pringsheim emend.
Coccolithophoracée à cycle digénétique composé d'une génération planctonique et d'une génération ben- thique pseudo-filamenteuse ou pseudo-parenchymateuse. La .génération planctonique est caractérisée par la pré- sence de cricolithes typiques des Cricosphaera. Les écailles sous-jacentes aux coccolithes sont circulaires, à marge épaissie et présentant, sur les deux faces, la même ornementation faite de stries radiales et d'un peloton fibrillaire lâche. Ecailles de l'haptonème plus petite, ovales. La génération benthique est composée de cellules renfermant un ou deux plastes pariétaux por- teurs d'un pyrénoïde proéminent; elles portent un revêtement fait de plusieurs couches d'écailles subcir- culaires, sans épaississement marginal, caractérisées par des stries radiales disposées en quatre secteurs sur l'une des faces et par des stries concentriques serrées sur l'autre face. Cette génération émet des zoïdes à deux fouets apicaux et haptonème, porteurs du même type d'écailles et dépourvus de coccolithes.

Pleurochrysis Pringsheim emend.
Coccolithophoracea with a digenetic cycle composed of a planktonic generation and a pseudo-filamentous or pseudo-parenchymal benthic generation. The planktonic generation is characterized by the presence of cricoliths typical of Cricosphaera. The scales underlying the coccoliths are circular, with a thickened margin and showing, on both sides, the same ornamentation made up of radial striations and a loose fibrillar platoon. Scales of the haptonema smaller, oval. The benthic generation is composed of cells containing one or two parietal plastids carrying a prominent pyrenoid; they have a coating made up of several layers of subcircular scales, without marginal thickening, characterized by radial ridges arranged in four sectors on one side and by tight concentric ridges on the other side. This generation emits zoids with two apical flagella and a haptonema, carrying the same type of scales and devoid of coccoliths.

References:

Pringsheim, E. G. (1955). Kleine Mitteilungen über Flagellaten und Algen. I. Algenartige Chrysophyceen in Reinkultur. Archiv für Mikrobiologie. 21: 401-410. gs


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Pleurochrysis: Catalog entry compiled by Jeremy Young. Viewed: 5-8-2021

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