Palaeocompositus U.B.Deshmukh, S.Blanco & Molinari, 2022
Holotype species: Palaeocompositus evgenii U.B.Deshmukh, S.Blanco & Molinari
Original publication and holotype designation: Deshmukh, U.B., Blanco, S. & Molinari-Novoa, E.A. (2022). Palaeocompositus, gen. nov., a validation of the invalid fossil diatom designation “Compositus” Vekshina (Stictodiscaceae, Bacillariophyta). Notulae Algarum 247: 1-2, 1 figure.
Request PDFPrecise date of publication: 28 July 2022
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: Cylindrical diatom, with wide hyaline margins and undulate edges. Valves round, convex, radially undulate, 286 µm in diameter, 8-stripped, along each strip there is a radial recess. Toothed outgrowths bordered by a hyaline undulate keel near the edges, with hook-shaped spits on top. Areolated pits rounded, unequal, densely packed spanning the entire valve, 0.75–1 to10 µm of diameter. The upper valve resembles that of Pyrgodiscus antiquus, but the nature of the depressions in the valve (in the form of triangular sectors rather than rectangular ones) and the larger structure compared to that of other Jurassic diatoms, justifies a new genus and species.
Information contributed by: U.B. Deshmukh. The most recent alteration to this page was made on 2023-08-24 by E.A. Molinari Novoa.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as masculine.
Comments: Vekshina (1960) commented on its putative affiliations that “due to the great originality of the new form, it is rather difficult to establish its relationship with known genera”, and referred this genus to the Actinodiscaceae (Coscinodiscales, Coscinodiscophyceae, currently Heliopeltaceae). She compared it to Pyrgodiscus antiquus Forti & P.Schulz (Aulacodiscaceae), noting that the general cylindrical structure was similar to it; however, she further noted that the radial waviness and big size of the valves put this entity closer to Actinoptychus Ehrenberg. We follow the assignment of the Global Biodiversity Information Facility (GBIF) Algae Classification for the genus (https://www.gbif.org/zh-tw/species/4248).
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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=53940
Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 24 August 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 27 April 2024
