163,959 species and infraspecific names are in the database, 22,784 images, 63,109 bibliographic items, 484,421 distributional records.

Antarctosaccion Delépine, 1970

Empire Eukaryota
Kingdom Chromista
Phylum Ochrophyta
Class Chrysomeridophyceae
Order Chrysomeridales
Family Chrysomeridaceae

Holotype species: Antarctosaccion applanatum (Gain) Delépine

Original publication and holotype designation: Delépine, R., Lamb, I.M. & Zimmerman, M.H. (1970). Sur les algues marines antarctiques rapportées au genre Monostroma Thuret. Compte Rendu Hebdomadaire des Séances de l’Académie des Sciences. Paris. Série D 270: 1973-1976.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.

Description: Thallus simple, saccate, monostromatic but flattened with the two cell layers in contact, resembling young individuals of Monostroma in shape but yellow brown in color, 2-5 cm long and 1-3 cm broad, attached by a minute basal disc. Thalli thin, 7-12 &m thick, very fragile, becoming irregularly lacerated at the upper end. Cells (4-7 &m in diam.) embedded in mucilage, isodiametric in surface view, in section rounded or vertically oblong, showing no regular arrangement. One yellowish brown parietal chloroplast with a lateral pyrenoid. Zoospores formed singly from vegetative cells. Zoospores small, spherical (3-4 &m in diam.), with 2 lateral, unequal heterokont flagella (4-5 and 10 &m). The longer anterior flagellum undulates, while the shorter one remains stiff. One chloroplast with a stigma. Stomatocysts and sexual reproduction not recorded. A marine sublittoral alga endemic to Antarctica (Antarctic Peninsula and Shetland Islands), always epiphytic on Plocamium. First described as an antarctic Monostroma, Antarctosaccion appears closely related to the genus Phaeosaccion from cold waters of the northern hemisphere. Ultrastructural details are lacking.

Information contributed by: C.Billard. The most recent alteration to this page was made on 20 Oct 2021 by M.D. Guiry.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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):

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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.

Created: 28 December 2000 by M.D. Guiry

Verified by: 20 October 2021 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43058

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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 27 October 2021.

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