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

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

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Information kindly contributed by Original description but may now be outdated.

Taxonomic status: The taxonomic or nomenclatural status (or both) of this entity is in some way unresolved and requires further investigation.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=52658

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 11 January 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 April 2024