157,001 species and infraspecific names are in the database, 22,048 images, 60,697 bibliographic items, 451,449 distributional records.

Bacterosira Gran, 1900

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Thalassiosirophycidae
Order Thalassiosirales
Family Thalassiosiraceae

Holotype species: Bacterosira fragilis (Gran) Gran

Currently accepted name for the type species: Bacterosira bathyomphala (Cleve) Syvertsen & Hasle

Original publication and holotype designation: Gran, H.H. (1900). Bemerkungen ├╝ber einige Planktondiatomeen. Nytt Magasin for Naturvidenskapene 38: 102-128.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Sylabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. 13th Ed. Photoautotrophic eukaryotic algae Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Heterokontophyta/Ochrophyta, Chlorarachniophyta/Cercozoa, Euglenophyta/Euglenozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 64-103. Stuttgart: Borntraeger Science Publishers.

Description: Cells weakly silicified. Frustules barrel-shaped, joined by interlocking of marginal processes to form chains. Valves circular. Valve face flat with slightly depressed center and narrow mantle. Valve structure consists of irregular radial striae between branching costae. Striae pseudoloculate, more than 30 in 10 &m, with 1-2 rows of finely perforated vela. Pseudoloculi may be complete only in marginal part of valve. Central cluster of numerous fultoportulae surrounded by hylaine ring. One ring of marginal fultoportulae, 5-9 in 10 &m. One marginal rimoportula, lying in the marginal ring of fultoportulae. Copula collar-shaped, one pleura per valve. Plastids numerous, small lobate discs. Differs from Lauderia, Porosira and Detonula by the presence of numerous central processes. Differs from Thalassiosira by mode of colony formation. Resting spores circular, heterovalvar, the primary valve having a steep central elevation and a slightly elevated rim, shaped like a Mexican sombrero. Secondary valve almost flat, with very low central elevation. Valves areolate, areolae radially elongate, arranged in irregular radial rows. Areolae with volae. One ring of fultoportulae, apparently no central processes. One rimoportula in marginal ring. Marine, planktonic in coastal zone of Arctic regions.

Information contributed by: C. Sancetta. The most recent alteration to this page was made on 4 Aug 2017 by M.D. Guiry.

Numbers of names and species: There are 4 species names in the database at present, as well as 1 infraspecific names. Of the species names, 2 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.

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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: 16 April 2003 by M.D. Guiry

Verified by: 04 August 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45162

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 15 December 2019.

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