152,876 species and infraspecific names are in the database, 20,939 images, 59,121 bibliographic items, 408,269 distributional records.

Chaetoceros Ehrenberg, 1844

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Chaetocerotophycidae
Order Chaetocerotales
Family Chaetocerotaceae

Lectotype species: Chaetoceros tetrachaeta Ehrenberg

Original publication:Ehrenberg, C.G. (1844). Einige vorläufige Resultate seiner Untersuchungen der ihm von der Südpolreise des Captain Ross, so wie von den Herren Schayer und Darwin zugekommenen Materialien über das Verhalten des kleinsten Lebens in den Oceanen und den grössten bisher zugänglichen Tiefen des Weltmeeres. Bericht über die zur Bekanntmachung Geeigneten Verhandlungen Der Königl. Preuss. Akademie Der Wissenschaften zu Berlin 1844: 182-207.
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Type designated in Boyer, C.S. (1927). Synopsis of North American Diatomaceae. Part I - Coscinodiscatae, Rhizosolenatae, Biddulphiatae, Fragilariatae. Proceedings of the Academy of Natural Sciences of Philadelphia 78(Suppl.): 1-228.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as masculine.

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.

Nomenclatural notes
Two species were included in the original publication (p. 200): C. dichaeta and C. tetrachaeta, no type was designated. - (13 Jan 2007) - Wendy Guiry

Initially considered feminine (Ehrenberg 1844), then neuter and then masculine (Van Landingham 1968). The genus is treated as masculine here, as are all genera with the suffix "-ceros". In accordance with the Code, genera with the suffix "-ceras" are, however, treated as neuter. - (9 Sep 2012) - M.D. Guiry

Description: Generally colonial bipolar centric diatoms. Forms cylindrical cells with an oval or circular base that contain 1, 2 or more chloroplasts. The chloroplasts appear to be quadrangular in cingular view and elliptic or circular in valve view. The mantle is vertical and the cingulum is more or less developed. Processes, called setae, that are of varying thickness emerge from each apex. In the colonial species the terminal setae, those emerging from the last valve in the colony, are distinguished from intercalary setae, those of the internal valves that cross each other and/or fuse at some point, allowing the formation colonies of differing lengths. Specialised intercalary setae are found in some species (C. compressus , C. diversus , C. messanensis), which are different in size and shape from the other setae in the colony. An aperture that varies in size and shape and is delimited by the valve faces and the proximal part of the setae separates the cells of a colony. The valve surface generally has radial costae originating from a central hyaline\transparent annulus. The rimoportula, when present, is located centrally or subcentrally, usually with a short external tube. In the cingulum, the intercalary bands and the pleurae are of the open or segmented type. The setae have a variable ornamentation, often consisting of rows of spines or pores of different sizes.

Information contributed by: Modified from http://www.szn.it/botanica/database/chaetoceros_en.htm. The most recent alteration to this page was made on 6 Aug 2017 by M.D. Guiry.

Numbers of names and species: There are 367 species names in the database at present, as well as 172 infraspecific names. Of the species names, 214 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
Hustedt, F. (1930). Bacillariophyta (Diatomeae) Zweite Auflage. In: Die Süsswasser-Flora Mitteleuropas. Heft 10. (Pascher, A. Eds), pp. [i]-vii, [1]-466. Jena: Verlag von Gustav Fischer.

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: 11 April 2002 by M.D. Guiry

Verified by: 06 August 2017 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43689

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 September 2018.

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