Brachiomonas Bohlin, 1897
Lectotype species: Brachiomonas submarina Bohlin
Original publication:Bohlin, K. (1898 '1897'). Zur Morphologie und Biologie einzelliger Algen. Öfversigt af Kongliga [Svenska] Vetenskadademiens Förhanligar, Stockholm 54: 507-529.
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. -261. Paris: Éditions du Centre National de la Recherche Scientifique 15, quai Anatole France - 75700 Paris.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Massjuk, 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..
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 1 Jan 2018 by M.D. Guiry.
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.
Numbers of names and species: There are 4 species names in the database at present, as well as 1 infraspecific names. Of the species names, 2 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.
Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.
Throndsen, J. (1996). The planktonic marine flagellates. In: Identifying marine phytoplankton. (Tomas, C.R. Eds), pp. 591-730. San Diego: Academic Press.
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: 28 December 2000 by M.D. Guiry
Verified by: 01 January 2018 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=39840
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 19 May 2019.