Phacus Dujardin, 1841, nom. et typ. cons.

Holotype species: Phacus longicauda (Ehrenberg) Dujardin

Original publication and holotype designation: Dujardin, F. (1841). Histoire naturelle des Zoophytes, Infusoires, comprenant la physiologie et la clasification de ces animaux et la manière de les étudier à l'aide du microscope. pp. i-xii, 1-684. Paris: Librarie Encyclopédique de Roret.

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Description: Green flagellates with rigid, compressed cells, most species being very flat and leaf-shaped, often with ridges, folds or grooves running helically or longitudinally, giving the cells irregular or triradiate cross-sections; (20)35(50+) _ (10)25(40+) _m; many species with a long posterior spine, shaped like flattened spinning tops; some species twisted into flat corkscrews. Flagella, eyespot and flagellar swelling as in Euglena. Chloroplasts usually small, discoid and numerous, usually without pyrenoids; a few species (e.g. P. splendens) have large flat chloroplasts with pyrenoids; paramylon typically deposited as a few large granules (often rings) together with many small ones. Pochmann (1942) reviewed the genus and proposed the subgenus Phacus for green forms and Hyalophacus for colorless forms; the latter are treated here as a separate genus; Pochmann and, previously, Lemmermann (1901) divide the green genera into several sections (see Huber-Pestalozzi, 1955, and Bourrelly, 1970). EM studies include those by Dynesius and Walne (1975), Bourrelly and Couté (1981). Freshwater; worldwide. Emend. Marin & Melkonian (in Marin et al. 2003: 101). Emend. Linton & Karnkowska 2010 in Linton et al. 2010: 609.

Information contributed by: G.F. Leedale. The most recent alteration to this page was made on 2024-02-06 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.

Most recent taxonomic treatment adopted: Kostygov, A.Y., Karnkowska, A., Votýpka, J., Tashyreva, D., Maciszewski, K., Yurchenko, V. & Lukeš, J. (2021). Euglenozoa: taxonomy, diversity and ecology, symbioses and viruses. Open Biology 11(200407): 1-47.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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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Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 06 February 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 22 June 2024

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