Cerataulina H.Peragallo ex F.Schütt, 1896, nom. cons.
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.
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 2015-10-19 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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.
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.
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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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=44365
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 October 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 17 August 2022