159,064 species and infraspecific names are in the database, 22,530 images, 61,696 bibliographic items, 462,690 distributional records.

Thalassionema Grunow ex Mereschkowsky, 1902

Holotype species: Thalassionema nitzschioides (Grunow) Mereschkowsky

Original publication and holotype designation: Mereschkowsky, C. (1902). Liste des Diatomées de la Mer Noire. Scripta Botanica (Botanisheskia Zapiski) 19: 51-88.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Tomas, C.R., Eds (1996). Identifying marine diatoms and dinoflagellates. pp. 1-858. San Diego: Academic Press Inc.

Nomenclatural notes
Note in the California Academy of Science Diatoms datbase: "Type by monotypy. Grunow in Van Heurck 1881 (ref. 001035), pl. 43, fig. 7-10, reads: "Thalassiothrix?? nitschioides. La ressemblance avec le Synedra affinis est maintenant évidente. Entre les perles on voit encore de courtes stries ce qui rend douteux le classement de cette forme parmi les Thalassiothrix. On pourrait peut être créer un nouveau genre nommé Thalassionema Grunow". In Van Heurck 1896 (p. 319, ref. 000897), the genus Thalassionema Grunow is introduced with illustration of Thalassionema nitzschoides and the comments: "in my Atlas, pl. 43, fig. 7-10, Grunow has proposed to raise Synedra nitzschoides to the rank of a new genus. I have preferred to preserve this form (as I have done in the text of the Synopsis) among the Synedra with which I arranged it in the first instance". According to ICBN art. 34.1 (b) Thalassionema was not validly published by Grunow in Van Heurck 1881 because "it is merely proposed in anticipation of the future acceptance of the group concerned" and according to Art. 34.1 (a) it is definitely not validly published in Van Heurck 1896 because "it is not accepted by the author". The name Thalassionema was validly published as the epithet in the name of a subgenus of Synedra by Peragallo & Peragallo (1901) (ref. 001056). In this publication although the species nitzschioides is given under "Thalassionema" (see pl. 81, fig. 17-18), Thalassionema is clearly introduced as a subgenus, p. 308, and the combination Thalassionema nitzschioides is not validly published. According to ING (1996) (information not verified by us), M. Peragallo in 1921 (ref. 00737), p. 69, elevates the subgenus to genus level. Meanwhile, however, Mereschkowsky 1902, p. 78 (ref. 001381) accepted Grunow's provisional genus. Genus also accepted by Mereschkowsky 1902, p. 429 (ref. 006512). Thus the correct authorship of Thalassionema is Grunow ex Mereschkowsky. This genus has been cited incorrectly as "Thalassionema Grunow in Van Heurck 1881, pl. 43, fig. 7-10 "(ref. 001035, Synopsis Diat. Belgique) (see SVL), "Thalassionema Grunow ex Hustedt in Rabenhorst. Krypt.-Flora Deutschl. 7(2):244, 1932" (ref. 000506) (see Round, Crawford & Mann 1990, p. 704, and Farr et al. 1979, p. 1744), or "Thalassionema (H. Peragallo & M. Peragallo) M. Peragallo, 2me Expédition Antarctique Française (1908-1910) Comm. J. Charcot, Bot. Diat. 69. 1921" (ref. 000737) (see ING 1996). Silva & Hasle 1997, in Taxon, 46(2):331-332, proposed to conserve the name Synedra nitzschoides with a conserved type to preserve the current application of the generic name Thalassionema. The conservation was recommended by the permanent committee on Algae (P. Compère, pers. com., 1998). " - (18 Aug 2010) - M.D. Guiry

Comments: Hasle & Syvertsen (1997: 257) record the authority for this species as 'Grunow ex Mereschkowsky 1902'.

Numbers of names and species: There are 17 species names in the database at present, as well as 12 infraspecific names. Of the species names, 9 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.

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

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

Created: 11 April 2002 by M.D. Guiry

Verified by: 08 June 2012 by Michael Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43767

Citing AlgaeBase
Please cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 28 September 2020.

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