163,924 species and infraspecific names are in the database, 22,783 images, 63,106 bibliographic items, 484,278 distributional records.

Helicotheca M.Ricard, 1987

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Biddulphiophycidae
Order Briggerales
Family Streptothecaceae

Holotype species: Helicotheca tamesis (Shrubsole) M.Ricard

Original publication and holotype designation: Ricard, M. (1987). Atlas du Phytoplankton Marin. Vol. 2. Diatomophycées. pp. 1-297. Paris: Éditions du Centre National de la Recherche Scientifique.

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.

Taxonomic notes
Lithodesmiales (Gómez et al., 2018). - (16 Jan 2020) - Wendy Guiry

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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
Gómez, F., Wang, L. & Lin, S. (2018). Molecular phylogeny suggests the affinity of the planktonic diatoms Climacodium and Bellerochea (Lithodesmiales, Mediophyceae). Diatom Research 33(3): 349-354.

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

Created: 27 April 2003 by Mairead Murphy

Verified by: 07 May 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46453

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 October 2021.

SITE © 1996 - 2021 M.D. Guiry. All rights reserved.

Website Design : 249 Design Studio