163,469 species and infraspecific names are in the database, 22,770 images, 62,968 bibliographic items, 480,353 distributional records.

Gessnerium Halim, 1967

Empire Eukaryota
Kingdom Chromista
Subkingdom Harosa (supergroup SAR)
Infrakingdom Halvaria
Phylum Miozoa
Subphylum Myzozoa
Infraphylum Dinozoa
Superclass Dinoflagellata
Class Dinophyceae
Order Gonyaulacales
Family Ostreopsidaceae

Holotype species: Gessnerium mochimaense Halim

Currently accepted name for the type species: Alexandrium monilatum (J.F.Howell) Balech

Original publication and holotype designation: Halim, Y. (1967). Dinoflagellates of the south-east Caribbean sea. Internationale Revue der gesamten Hydrobiologie 52(5): 701-755.

Taxonomic status: currently regarded as a synonym of Alexandrium.

Most recent taxonomic treatment adopted: Mertens, K.N. Adachi, M., Anderson, D.M., Band-Schmidt, C.J., Bravo, I., Brosnahan, M.L., Bolch, C.J.S., Calado, A.J., Caronell-Moore, M.C.C., Chomérat, N., Elbrächter, M., Figueroa, R.I., Fraga, S., Gárate-Lizárraga, I., Garcés, E., Gu, H.F., Hallegraeff, G., Hess, P., Hoppenrath, M., Horiguchi, T., Iwataki, M., Uwe, J., Kremp, A., Larsen, J., Leaw, C.P., Li, Z., Lim, P.T., Litaker, W., MacKensie, L., Masseret, E., Matsuoka, K., Moestrup, Ø., Montressor, M., Nagai, S., Nézan, E., Nishimurea, T., Okolodkov, Y.B., Orlova, T.Yu., Reñé, A., Sampedro, N., Satta, C.T., Shin, H.H., Siano, R., Smith, K.F., Steidinger, K., Takano, Y., Tillmann, U., Wolny, J., Yamaguchi, A. & Murray, S. (2020). Morphological and phylogenetic data do not support the split of Alexandrium into four genera. Harmful Algae 98(101902): , 2 tables.

Nomenclatural notes
"Gessnerium Halim ex Halim 1969 Int. Rev. Ges. Hydrobiol. 54: 619" Dinophyta site. - (26 Sep 2014) - M.D. Guiry

Taxonomic notes
Mertens & al. (2020) contend that morphological and phylogenetic data do not currently support the split of Alexandrium into four genera, including Gessnerium as advocated by Gómez & Artigas (2019). - (14 Jan 2020) - M.D. Guiry

Description: Dinoflagellates with nearly the same plate pattern as species of the genus Alexandrium Halim, but the first apical plate does not contact the apical pore. This feature is not regarded as sufficient for separating the species at the genus level. Gessnerium is currently regarded as subgenus of Alexandrium. Marine plankton

Information kindly contributed by M. Elbrächter but may now be outdated.

Numbers of names and species: There are 17 species names in the database at present.

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.

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

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: 21 September 2020 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=45547

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 28 September 2021.

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