Pseudotriceratium Grunow, 1884

Lectotype species: Pseudotriceratium fallax Grunow

Original publication: Grunow, A. (1884). Die Diatomeen von Franz Josefs-Land. Denkschriften der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe, Wien 48(Abt. 2): 53-112, 5 pls.

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Type designated in: Glezer, Z.I. (1975). K revizii roda Triceratium Ehr. sensu Hustedt, 1930 (Bacillariophyta) [To the revision of the genus Triceratium Ehr. sensu Hustedt, 1930 (Bacillariophyta)]. Botanicheskii Zhurnal 60(9): 1304-1310, 3 plates. [in Russian]

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Fossil: This is a genus of fossil species, or a genus with a fossil type species, or a genus the type species of which was originally described as a fossil.

Description: Cells triangular in valve view. Habit and plastids not known. A marine planktonic genus possibly mainly tropical/subtropical in distribution. Species of the genus have formerly been placed in Triceratium. Valves triangular. Valve face flat to slightly bowed; valve mantle indistinct. External areolation of clustered pores in central region merging into isolated pores elsewhere. Cribra not observed. Internally with large circular apertures; valve loculate. Rimoportulae occur in the apices only, or there and along the lateral margins; in some species an additional central rimoportula occurs. External openings of the rimoportulae not expanded other than into a slight flange around the oval aperture; internally short, sessile. Copulae not observed.

The most recent alteration to this page was made on 2011-10-20 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.

Comments: One of our specimens seems close to Simonsen's (1974) illustration of P. punctatum (see Simonsen for numerous synonyms). The genus differs greatly from Triceratium, notably in the absence of ocelli, and from Trigonium by the lack of both pseudocelli and the central cluster of rimoportuilae. As with other triangular genera, Pseudotriceratium also needs a detailed study.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=46625

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 October 2011. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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