Pleurastrosarcina H.J.Sluiman & P.C.J.Blommers, 1990

Holotype species: Pleurastrosarcina brevispinosa (S.Chantanachat & Bold) H.J.Sluiman & P.C.J.Blommers

Currently accepted name for the type species: Chlorosarcina brevispinosa S.Chantanachat & Bold

Original publication and holotype designation: Sluiman, H.J. & Blommers, P.C.J. (1990). Ultrastructure and taxonomic position of Chlorosarcina stigmatica Deason (Chlorophyceae, Chlorophyta). Archiv für Protistenkunde 138: 181-190.

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Description: Thalli unicellular or multicellular, forming spherical unicells or packets of cells or pseudofilaments. Cells uninucleate; chloroplasts single and parietal without pyrenoids. Asexual reproduction by sporulation in which several successive bipartitions of cells occur at right angles to produce groups of cells that subsequently fragment. Wall-less biflagellate zoospores with variable cell shape, lack stigmata. Flagellar apparatus with counter-clockwise absolute orientation of basal bodies, cruciate flagellar roots with the number of microtubules of the X-roots variable (5 or 6) and a highly developed rhizoplast. Sexual reproduction unknown. Pleurastrosarcina brevispinosa has akinetes with short spines and occurs mostly in solitary cells or, at low culture temperature, forms pseudofilaments. P. longispinosa has akinetes with long spines and mostly forms sarcina-like packets.Both species were isolated from soil samples of arid habitats in North America and Croatia and are available from culture collections. Species of Pleurastrosarcina were formerly placed in Chlorosarcina Gerneck emend. Vischer. However, Chlorosarcina stigmatica Deason is clearly distinguished from Pleurastrosarcina by zoospores with chlorophycean characters (i.e. clockwise absolute orientation of basal bodies and presence of two accessory basal bodies) in C. stigmatica and is therefore placed in the Chlorococcales, Chlorophyceae. A third genus, Desmotetra Deason & Floyd, is regarded as synonymous with Chlorosarcina because recent observations based on material of C. stigmatica from the Innsbruck Culture Collection revealed that Deason's original description of C. stigmatica is still valid. Genus considered closely related to Friedmannia, from which it differs by the absence of sarcinoid packets of cells in Friedmannia and by some ultrastructural features of the zoospores in Pleurastrosarcina (prominent rhizoplast, cell shape variable and not laterally compressed). Friedmannia has been referred by some authors to the class Pleurastrophyceae. Thalli unicellular or multicellular, forming spherical unicells or packets of cells or pseudofilaments. Cells uninucleate; chloroplasts single and parietal without pyrenoids. Asexual reproduction by sporulation in which several successive bipartitions of cells occur at right angles to produce groups of cells that subsequently fragment. Wall-less biflagellate zoospores with variable cell shape, lack stigmata. Flagellar apparatus with counter-clockwise absolute orientation of basal bodies, cruciate flagellar roots with the number of microtubules of the X-roots variable (5 or 6) and a highly developed rhizoplast. Sexual reproduction unknown. Pleurastrosarcina brevispinosa has akinetes with short spines and occurs mostly in solitary cells or, at low culture temperature, forms pseudofilaments. P. longispinosa has akinetes with long spines and mostly forms sarcina-like packets.Both species were isolated from soil samples of arid habitats in North America and Croatia and are available from culture collections. Species of Pleurastrosarcina were formerly placed in Chlorosarcina Gerneck emend. Vischer. However, Chlorosarcina stigmatica Deason is clearly distinguished from Pleurastrosarcina by zoospores with chlorophycean characters (i.e. clockwise absolute orientation of basal bodies and presence of two accessory basal bodies) in C. stigmatica and is therefore placed in the Chlorococcales, Chlorophyceae. A third genus, Desmotetra Deason & Floyd, is regarded as synonymous with Chlorosarcina because recent observations based on material of C. stigmatica from the Innsbruck Culture Collection revealed that Deason's original description of C. stigmatica is still valid. Genus considered closely related to Friedmannia, from which it differs by the absence of sarcinoid packets of cells in Friedmannia and by some ultrastructural features of the zoospores in Pleurastrosarcina (prominent rhizoplast, cell shape variable and not laterally compressed). Friedmannia has been referred by some authors to the class Pleurastrophyceae.

Information kindly contributed by D. Garbary & T. Friedl but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Chlorosarcina.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 22 April 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 March 2024

 
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