Pedinomonas Korshikov, 1921

Lectotype species: Pedinomonas minor Korshikov

Original publication: Isachenko, B.L., Eds (1921). Dnevnik 1-go Vserossiyskogo Sjezda Russkikh Botanikov [Diary of the 1st All-Russian Congress of Russian Botanists]. pp. ii, 108, iv. Petrograd. [in Russian]

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Type designated in: Loeblich, A.R., III (1967). Notes on the divisions Chlorophyta, Chrysophyta, Pyrrophyta and Xanthophyta and the family Paramastigaceae. Taxon 16: 230-237.

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Description: Unicellular flagellates with single emergent flagellum. Cell shape elongate-elliptic to rounded, occasionally more irregular, slightly asymmetric, somewhat flattened. The flagellum is inserted laterally near the front end and directed backwards during swimming. A second basal body is arranged counterclockwise without overlapping. The flagellum carries very thin hair-like appendages. Cell naked with single parietal chloroplast. In some species a single pyrenoid is present in the posterior half of the cell, in others 2 or no pyrenoids have been reported. A single eyespot is located on the surface of the pyrenoid. Freshwater species with a contractile vacuole in the front end. Mitosis of an unusual type in green algae, closed without polar fenestrae. Cell division takes place without development of a phragmoplast or phycoplast. Palmella stages known. Sexual reproduction reported in earlier literature but not confirmed recently. Asexual cysts well known, in some species smooth-walled, in one species with conspicuous warts. The described species differ in cell shape and size, number or pyrenoids and presence or absence of stigma. While the best known species occurs in many types of fresh waters worldwide (forming blooms in eutrophic waters), others have been described from marine plankton, rockpools, salt lakes, etc. Some species (not studied in detail) have been described as epizoic on crustaceans, one as a symbiont in Noctiluca and one in the radiolarian Thalassolampe. Several species need to be studied critically before their inclusion in Pedinomonas is justified. One marine species has recently been transferred to the new genus Resultor. For detailed ultrastructural studies, see Ettl and Manton (1964), Pickett-Heaps and Ott (1974, mitosis and cell division) with discussion and establishing of the class Pedinophyceae by Moestrup (1991).

Information contributed by: Ø. Moestrup. The most recent alteration to this page was made on 2021-09-01 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 feminine.

Most recent taxonomic treatment adopted: Marin, B. (2012). Nested in the Chlorellales or independent class? Phylogeny and classification of the Pedinophyceae (Viridiplantae) revealed by molecular phylogenetic analyses of complete nuclear and plastid-encoded rRNA operons. Protist 163(5): 778-805, 6 figures, 4 tables.

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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.

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E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 01 September 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 July 2024

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