162,510 species and infraspecific names are in the database, 22,763 images, 64,036 bibliographic items, 475,219 distributional records.

Placoneis Mereschkowsky, 1903

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Cymbellales
Family Gomphonemataceae

Lectotype species: Placoneis gastrum (Ehrenberg) Mereschkowsky

Original publication:Mereschkowsky, C. (1903). Über Placoneis, ein neues Diatomeen-Genus. Beihefte zum Botanischen Centralblatt 15(1): 1-30, pl. 1.

Type designated in Cox, E.J. (1987). Placoneis Mereschkowsky: the re-evaluation of a diatom genus originally characterized by its chloroplast type. Diatom Research 2(2): 145-157.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Kociolek, J.P. & Spaulding, S.A. (2003). Symmetrical Naviculoid Diatoms. In: Freshwater Algae of North America, Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 637-654. San Diego: Academic Press.

Nomenclatural notes
Also appeared in Bulletin de la Société Impériale des Naturalistes de Moscou, ser. 2, 17: 162, by the same author. - (13 Sep 2018) - M.D. Guiry

Numbers of names and species: There are 187 species names in the database at present, as well as 48 infraspecific names. Of the species names, 133 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.

References
Mereschkowsky, C. (1903). Nouvelles recherches sur la structure et la division des Diatomées. (Rapport préliminaire.) . Bulletin de la Société Impériale des Naturalistes de Moscou, ser. 2 17(1): 149-172, 41 figs.

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

Created: 23 April 2002 by M.D. Guiry

Verified by: 02 February 2016 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44201

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 04 August 2021.

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