Bacterosira Gran, 1900

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 über einige Planktondiatomeen. Nytt Magasin for Naturvidenskapene 38: 102-128.

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 2017-08-04 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Syllabus 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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 04 August 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024