163,335 species and infraspecific names are in the database, 22,769 images, 62,932 bibliographic items, 478,466 distributional records.

Membraneis Paddock, 1988

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Naviculales
Suborder Naviculineae
Family Naviculaceae

Holotype species: Membraneis challengeri (Grunow) Paddock

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Hasle, G.R. & Syvertsen, E.E. (1996). Marine diatoms. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 5-385. San Diego: Academic Press.

Description: Frustules elliptical in outline, almost always lying in girdle view. Valves narrow with a highly vaulted raphe-bearing ridge, the line of the ridge forming a smooth curve from pole to pole with only a small depression at the central nodule, ridges lacking fins and fibulae; one side of valve higher than other forming a false ridge. Valves thin with punctate striae, extreme valve margin hyaline; raphe lies on ridge of valve, the central part of the raphe system is displaced from the apparent mid-line of the valve, one enlarged, tubular helictoglossa located at each pole, terminal micropyles absent. Girdle bands hyaline. Collected in plankton from the Antarctic and south Atlantic Oceans.

Information contributed by: D. B. Czarnecki. The most recent alteration to this page was made on 28 Jun 2005 by M.D. Guiry.

Numbers of names and species: There are 2 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.

References
Scott, F.J. & Thomas, D.P. (2005). Diatoms. In: Antarctic marine protists. (Scott, F.J. & Marchant, H.J. Eds), pp. 13-201. Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division.

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

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: 16 April 2003 by M.D. Guiry

Verified by:

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45808

Citing AlgaeBase
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 September 2021.

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

Website Design : 249 Design Studio