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Cerataulina H.Peragallo ex F.Schütt, 1896, nom. cons.

Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Mediophyceae
Subclass Chaetocerotophycidae
Order Hemiaulales
Family Hemiaulaceae

Holotype species: Cerataulina bergonii (H.Peragallo) F.Schütt

Currently accepted name for the type species: Cerataulina pelagica (Cleve) Hendey

Original publication and holotype designation: Schütt, F. (1896). Peridiniales (Peridineae, Dinoflagellata, Cilioflagellata, arthrodele Flagellaten). Bacillariales (Diatomeae). In: Die natürlichen Pflanzenfamilien...I. Teil. Abt. 1b. (Engler, A. & Prantl, K. Eds), pp. 1-153. Leipzig: Wilhelm Engelmann.
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Taxonomic status: currently recognized as a distinct genus.

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
CAS comments: "Name conserved vs. Syringidium Ehrenberg 1845 (nom. rej., taxonomic synonym) (see ICBN 1988, p. 119, ref. 006921). Originally monotypic. Round et al., 1990 (ref. 003245) p. 266 give: "Cerataulina H. Peragallo. Le Diatomiste 1, no. 9:103, 1892" (ref. 000730). ICBN 1956, and subsequent botanical codes give reference as above. Peragallo (1892) (ref. 000730) p. 103, within a paragraph about Cerataulus said (in French): "I reported under this genus a small form.....with the name Cerataulus bergonii. The zone is annulated but I could not observe seams. The two appendices are bearing small spines. The characters of this species perhaps could be distinct enough from those of the true Cerataulus to create a different genus, Cerataulina, characterized by the length always fairly long and the constant annulation of this zone. It is illustrated pl. 1, fig. 15-16 as Cerataulus (Cerataulina) bergonii". It is not validly published in Peragallo 1892 because it was not definitely accepted by the author, and ambiguity as to whether it is a genus or a subgenus. Valid publication in Schütt 1896 (ref. 001512) p. 95 where a German description of Cerataulina Peragallo is given; C. bergonii Peragallo is illustrated p. 96 (fig.165 A-C). " - (20 Oct 2011) - M.D. Guiry

Description: Cells narrowly cylindrical, joined in chains. The straight or slightly twisted chains of cells appear to have the valve faces fairly closely apposed, but the linkage between them is not strong and in the absence of 'hooked' interlocking devices the filaments easily break up into individual cells (cf. Lauderia and Guinardia). Two small submarginal elevations are present on each valve. Plastids discoid, lying in the peripheral cytoplasm. A delicate marine planktonic species common near coasts and penetrating into brackish waters. Valves circular, slightly mis-shaped by indentations to accommodate the spines of sibling valves, and by the formation of two wings subtending the two ocelli and extending in opposite directions. The wings have a spine close to the ocellus and then continue, forming a low ridge running round onto the mantle. The ocellus has very distinct tangential bars. The valve mantle is deep. The areolae are developed in a thin framework of radiating costae and are closed by fine porous cribra of varying complexity. Occasional simple pores also occur. A single rimoportula with a slit-like outer opening is located marginally (C. daemen, C. dentata) or centrally (C. pelagica). Internally the low rimoportula is obvious and the bars of the ocellus are continued to the inside. Copulae numerous, split, with ligulae and antiligulae, the splits occurring adjacent to each other or staggered.

The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.

Comments: Hasle & Syvertsen (1980) give an excellent detailed account of Cerataulina and its resting spore, described earlier as a separate genus, Syringigium. The systematic position of this genus, close to Eucampia, depends on the valve/areola structure and on the similarity of the ocellus. As others have commented, the Cerataulina/Eucampia-type ocellus (termed the 'costate ocellus' by Svertsen & Hasle, 1983) is somewhat specialised and should not be used as a feature to associate these genera with others having different kinds of ocelli, such as are found, for instance, in the Eupodiscaceae.

Numbers of names and species: There are 13 species names in the database at present, as well as 1 infraspecific names. Of the species names, 5 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):

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Verification of data
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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.

Created: 23 April 2002 by M.D. Guiry

Verified by: 19 October 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44365

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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 24 October 2021.

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