157,562 species and infraspecific names are in the database, 22,210 images, 60,980 bibliographic items, 458,858 distributional records.

Didymosphenia Mart.Schmidt, 1899, nom. et typ. cons.

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Cymbellales
Family Cymbellaceae

Holotype species: Didymosphenia geminata (Lyngbye) Mart.Schmidt

Original publication and holotype designation: Schmidt, A.[W.F.] (1899). Atlas der Diatomaceen-kunde. Series V: Heft 54 . pp. pls 213-216 [M. Schmidt]. Leipzig: O.R. Reisland .
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Dawson, P.A. (1973). Further observations on the genus Didymospaenia M. Schmidt - D. sibirica (Grun.) M. Schm. British Phycological Journal 8: 197-201, 12 figs.

Nomenclatural notes
Name and generitype conserved. CDN: "Name conserved vs. Dendrella Bory (nomenclatural synonym) and Diomphala Ehrenberg 1843 (taxonomic synonym) (see ICBN 1956, p. 200, ref. 006916). Introduced as a new genus (pl. 214, fig. 103: Didymosphenia n.g. sibirica) but later in the text seems to be considered a subgenus of Gomphonema: "Das neue Subgenus von Gomphonema ist durch das in beiden Endknoten scharf nach derselben Seite abbiegende Ende der Raphe immer deutlich gekennzeichnet" (this new subgenus of Gomphonema is characterized by the unilaterally curved ends of the raphe). Three species are originally included, D. sibirica (Grun.) M. Schmidt, D. curvirostrum (Temp. & Brun) M. Schmidt, and D. geminata (Lyng.) M. Schmidt, and no type is designated. Didymosphenia is also a nomenclatural synonym of Gomphonema Agardh (nom. rej.)." - (26 Jan 2017) - M.D. Guiry

Numbers of names and species: There are 24 species names in the database at present, as well as 21 infraspecific names. Of the species names, 24 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):

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

References
Hustedt, F. (1930). Bacillariophyta (Diatomeae) Zweite Auflage. In: Die Süsswasser-Flora Mitteleuropas. Heft 10. (Pascher, A. Eds), pp. [i]-vii, [1]-466. Jena: Verlag von Gustav Fischer.

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

Created: 11 April 2002 by M.D. Guiry

Verified by: 12 December 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43718

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 February 2020.

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