Brachiomonas Bohlin, 1898

Lectotype species: Brachiomonas submarina Bohlin

Original publication: Bohlin, K. (1898). Zur Morphologie und Biologie einzelliger Algen. Översigt af Kongliga Vetenskaps-Akademiens Förhandlingar 54(9): 507-529, 10 figures.

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Type designated in: Chrétiennot-Dinet, M.-J. (1990). Atlas du phytoplancton marin. Volume III: Chlorarachnophycées, Chlorophycées, Chrysophycées, Cryptophycées, Euglénophycées, Eustigmatophycées, Prasinophycées, Prymnesiophycées, Rhodophycées et Tribophycées Avec la collaboration de Chantal Billard et Alain Sournia. pp. [1]-261. Paris: Éditions du Centre National de la Recherche Scientifique 15, quai Anatole France - 75700 Paris.

Description: Unicellular thalli typically spherical to subspherical, with four prominent lobes extending posteriorly. Although protoplast normally fills cell, lobe tips may be hyaline. Each cell typically with two (sometimes 4) anterior contractile vacuoles, but these may be absent when found in brackish or marine habitat. Two isokont, anterior flagella. Single, large chloroplast in each cell. Pyrenoids present or absent, depending on species. Papillum absent or present. Eyespot prominent in most species at cell anterior, embedded in chloroplast. Nucleus single and typically central. Flagellar root system cruciate and composed of four sets of microtubule systems. Basal bodies exhibit clockwise absolute configuration. Mitosis characterized as closed spindle type, with spindle collapsing at telophase. Phycoplast system of microtubules develops in the plane of cytokinesis. First division typically longitudinal. Asexual reproduction by zoosporogenesis. Sporangium retains flagella and motility during sporulation. Four to eight zoospores (rarely 2) typically produced. Daughter cells are fully formed prior to liberation from sporangium. Aplanospores and akinetes (cysts) reported. Sexual reproduction isogamous; however, some species appear to also exhibit anisogamy. Gametogenesis may produce as many as 32 isogametes. Zygotes spherical with thick, flattened wall. Brachiomonas is normally found in brackish water or marine habitats, although it can occur in freshwater environments. Brachiomonas has been found in Japan, India, continental Europe, the United Kingdom, and the United States. Cell wall in Brachiomonas submarina of the type II lattice similar to Chlorogonium, Chloromonas, Polytoma, Carteria and some species of Chlamydomonas.

Information contributed by: M. Buchheim. The most recent alteration to this page was made on 2023-03-13 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: Masjuk, N.P., Lilitska, G.G. & Kapustin, D.O. (2011). Chlamydomonadales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 157-218. Ruggell: A.R.A. Gantner Verlag K.-G..

Comments: Brachiomonas is a small, but distinctive assemblage of primarily brackish water species. Segaar and Gerritsen, and Watanabe and others have studied Brachiomonas at the ultrastructural level. No biochemical or molecular data are currently available to assess the phylogenetic alliance(s) of this genus. Throndsen (1997: 665) included this in the Phylum Chromophyta.

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Contributors
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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=39840

Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 13 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 November 2024