Astasia Dujardin, 1841, nom. et typ. cons.
Holotype species: Astasia limpida 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.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Cavalier-Smith, T. (2016). Higher classification and phylogeny of Euglenozoa. European Journal of Protistology 56: 250–276, 2 figs.
Euglenaceae (Silva, 1980: 64). - (25 Mar 2013) - Wendy Guiry
Description: Colorless, free-swimming, osmotrophic, fusiform or elongated cells, 10-75 µm long, with moderate to violent euglenoid movement and flagella like Euglena but no eyespot or flagella swelling; therefore thought to be primitively colorless compared with forms like Cyclidiopsis and Khawkinea which have an eyespot and photoreceptor and must derive from green species that have lost their chloroplasts. The latter 2 genera and the phagotrophic Euglenopsis are included in the genus Astasia by Bourrelly (1985) but not by Huber-Pestalozzi (1955) or Leedale (1967). Christen (1962b) proposes 2 subgenera, Bourrelly (1985) 5. Of the numerous "genera" of colorless euglenoids named by Skvortzov (1957) but not described well enough to separate even as species, let alone genera, or to be demonstrably euglenoid, some might be Astasia. Also, Michajlow (1972) assigns various inadequately described endozoic or parasitic colorless flagellates to euglenoid genera, including Astasia (without any evidence of diagnostic euglenoid features). Larsen and Patterson (1991) discuss these in a review of the diversity of heterotrophic euglenoids. The physiology of Astasia spp. and the inferred parallelism between certain Astasia and Euglena spp. have been studied in detail by Pringsheim (1942, 1963). Species occur worldwide in fresh waters rich in organic matter.
Information contributed by: G.F. Leedale. The most recent alteration to this page was made on 25 May 2020 by M.D. Guiry.
Numbers of names and species: There are 140 species names in the database at present, as well as 25 infraspecific names. Of the species names, 45 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 11 April 2002 by M.D. Guiry
Verified by: 28 December 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43649
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 September 2021.