156,343 species and infraspecific names are in the database, 22,018 images, 60,428 bibliographic items, 446,040 distributional records.

Richelia J.Schmidt, 1901

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Nostocaceae

Holotype species: Richelia intracellularis J.A.Schmidt

Original publication and holotype designation: Ostenfeld, C.H. & Schmidt, J. (1902). Plankton fra det Røde Hav og Adenbugten (Plankton from the Red Sea and the Gulf of Aden.). Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening 1901: 141-182.
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Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Description: Filamentous; trichomes solitary, short, few-20-celled, straight or slightly arcuate, more or less cylindrical along the whole length, without sheaths or gelatinous envelopes, isopolar, slightly constricted at crosswalls. Cells isodiametric or shorter than wide, blue-green. Heterocytes more or less spherical, develop terminally, on one or (later) on both ends; they are wider than vegetative cells. Akinetes missing. Cells divide crosswise. Reproduction by dissociation of trichomes, typical hormogonia not observed. Marine, endophytic within cells (intracellular) or rarely epiphytic (on the surface of frustules) of oceanic, planktonic Diatoms (Rhizosolenia , Hemisulus, Chaetoceros, etc.), mainly in warm, tropical seas.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 4 Mar 2015 by M.D. Guiry.

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.

References
Komárek, J., Zapomelova, E. & Hindak, F. (2010). Cronbergia gen. nov., a new cyanobacterial genus (Cyanophyta) with a special strategy of heterocyte formation. Cryptogamie Algologie 31(3): 321-341.

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: 04 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=46174

Citing AlgaeBase
Please cite this record as:
M.D. Guiry 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 September 2019.

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