Gessnerium Halim, 1967

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.

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Information kindly contributed by M. Elbrächter but may now be outdated.

Taxonomic status: This name is 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.Y., 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.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 21 September 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 30 September 2023

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