Antarctosaccion Delépine, 1970

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.

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 2021-10-20 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

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.

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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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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 26 September 2023

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