154,210 species and infraspecific names are in the database, 21,059 images, 59,694 bibliographic items, 415,383 distributional records.

Ralfsiella P.A.Sims, D.M.Williams & M.Ashworth, 2018

Holotype species: Ralfsiella smithii (Ralfs) P.A.Sims, D.M.Williams & M.Ashworth

Original publication and holotype designation: Sims, P.A., Williams, D.M. & Ashworth, M.[P.] (2018). Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera. Phytotaxa 382(1): 1-56, 156 figs, 2 text-figs.

Taxonomic status: uncertain, requiring further investigation.

Description: Valve outline circular, lying opposite each other a barely raised narrow elevation with a circular ocellus at summit. Valve face almost flat with a narrow slightly convex valve mantle bordering an expanded hyaline valve margin. Valve face, mantle and elevations covered in an irregular network of false pseudoloculi. Lying within each “loculus” a single, small poroid areola occluded by a velum. These appear to be identical throughout the valve, no specialised pores seen. In a submarginal position, equidistant between the elevations lies the external opening of a rimoportula. The opening is through a long slender tube, slightly wider at base than summit, while interior opening a slit across a papillus. Girdle bands with vertical rows of poroid areolae, valvocopula and remaining copulae open.

Information kindly contributed by Original description but may now be outdated.

Numbers of names and species: There are 3 species names in the database at present, of which 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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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: 09 January 2019 by Salvador Valenzuela Miranda

Verified by: 09 January 2019 by Salvador Valenzuela Miranda

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=52658

Citing AlgaeBase
Please cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 January 2019.

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