Staurodesmus Teiling, 1948: 76

Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Charophyta
Class Conjugatophyceae
Order Desmidiales
Family Desmidiaceae

Lectotype species: Staurodesmus triangularis (Lagerheim) Teiling

Original publication:Teiling, E. (1948). Staurodesmus, genus novum. Botanica Notiser 1948: 49-83.
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Type designated inCompère, P. (1977). Staurodesmus Teiling (Desmidiacées). Typification du genre et combinaisons nouvelles. Bulletin du Jardin Botanique National de Belgique 47: 262-264.
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Taxonomic status: currently recognized as a distinct genus.

Description: Cells solitary, small to medium sized, with shallow or deep median constriction (isthmus) where semicell walls overlap. End view of cell elliptical or, more commonly, triangular or multiangular. Cell angles each with single stout or tiny spine, small granule or cell wall incrassation. Cell wall elsewhere unormamented but with scattered pores through which a broad gelatinous sheath often produced. Chloroplasts one per semicell, axial with lobes toward each angle of cell and one or two pyrenoids. Nucleus in isthmus. Asexual reproduction by cell division and new semicell formation characteristic of Cosmarium-type desmids (see Cosmarium). Sexual reproduction by conjugation known in several species. Conjugating cells come together and secrete a broad gelatinous envelope. Gametes fuse within conjugation tube; mature zygospore spherical, with many short or long, acute spines. Several species widespread; planktonic or periphytic in acidic, oligotrophic aquatic habitats. Staurodesmus combines most of the illegitimate genus Arthrodesmus with species of Staurastrum having unispinose angles; it cannot be absolutely distinguished from Staurastrum or Xanthidium because of intergrading forms.

NCBI Nucleotide Sequences

Numbers of names and species: There are 243 species (and infraspecific) names in the database at present, of which 65 have been flagged as currently accepted taxonomically.

Names: ('C' indicates a name that is currently accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

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.

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43547

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 May 2013.

Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6852