150,330 species and infraspecific names are in the database, 20,442 images, 57,825 bibliographic items, 380,995 distributional records.

Spirotaenia Brébisson, 1848

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Streptophyta infrakingdom
Phylum Charophyta
Class Conjugatophyceae (Zygnematophyceae)
Order Zygnematales
Family Mesotaeniaceae

Lectotype species: Spirotaenia condensata Brébisson

Original publication:Ralfs, J. (1848). The British Desmidieae. pp. [i]-xxii, [i], [1]-226, pls I-XXXV. London: Reeve, Benham & Reeve.
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Type designated in Silva, P.C. (1952). A review of nomenclatural conservation in the algae from the point of view of the type method. University of California Publications in Botany 25: 241-323.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.

Description: Cells solitary or grouped within common gelatinous matrix (often paired following division). Cells minute to medium sized (7-270 µm long, length 2-12 times width), elliptic, cylindric or fusiform, with broadly rounded to acutely pointed ends. Chloroplast parietal, spiral band, or axial mass with spiralling lateral ridges. Pyrenoids 2-many. Nucleus at middle but toward one side of cell. Asexual reproduction by transverse cell division only. Sexual reproduction by conjugation recorded for 3 species. Conjugating cells come together within broad gelatinous sheath, without conjugation tube. Zygospores spherical, single (S. obscura, S. truncata) or paired (S. condensata) between gametangia. Zygospore wall in S. condensata and S. obscura with coarse areolae; zygospore of S. truncata with short, conical spines. Karyogamy possibly soon after plasmogamy; meiosis at germination, producing four gones in S. condensata. Most Spirotaenia species rarely collected, usually confined to Europe and North America; only S. condensata and S. obscura common and cosmopolitan, in acidic aquatic habitats or Sphagnum bogs. Occasionally in subaerial habitats.

Information contributed by: J.F. Gerrath & M.D. Guiry. The most recent alteration to this page was made on 7 May 2013 by M.D. Guiry.

Comments: Most Spirotaenia species rarely collected, usually confined to Europe and North America; only S. condensata and S. obscura common and cosmopolitan, in acidic aquatic habitats or Sphagnum bogs. Occasionally in subaerial habitats. Recent studies suggest strongly that Spirotaenia is not related to Spirogyra and may not be part of the Zygnematophyceae but more related to Chlorokybus.

Numbers of names and species: There are 34 species names in the database at present, as well as 13 infraspecific names. Of the species names, 22 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is 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):

Clik here to also show infraspecific names in the list below.

References
Gontcharov, A.A. & Melkonian, M. (2004). Unusual position of the genus Spirotaenia (Zygnematophyceae) among streptophytes revealed by SSU rDNA and rbcL sequence comparisons. Phycologia 43: 105-113.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 11 April 2002 by M.D. Guiry

Verified by: 07 May 2013 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=t3fe21dd39f7d2e5d

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 18 January 2018.

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