Hyalobrachion Swindell, 1939

Holotype species: Hyalobrachion omphalotus Swindell

Original publication and holotype designation: Swindell, N. (1939). A new saprophytic genus of the Volvocales. New Phytologist 38: 335-339.

Description: Unicellular thalli, in general, spindle-shaped with four arms arising from the anterior half of the cell and oriented normal to the long axis of the cell. The arms are cruciate in cross-section. Two isokont flagella inserted at the apex. Chloroplast absent and cell lacks photosynthetic pigment. Papillum absent and pyrenoids not observed. Starch grains have been noted. Stigma present. Nucleus centrally positioned. Contractile absent or present, depending on the species. When present, contractile vacuoles numerous and scattered throughout the cytoplasm. Asexual reproduction by zoosporogenesis (sporangium is motile) resulting in four motile daughter cells. Resting stages, covered with a mucilage layer, have been observed. No sexual stages have been observed in this genus. Hyalobrachion is regarded as a colorless parallel to Brachiomonas. Hyalobrachion grows heterotrophically and has been found in eastern Europe and the United Kingdom. No ultrastructural, biochemical, or molecular data are available for this organism

Information contributed by: M. Buchheim. The most recent alteration to this page was made on 2012-06-28 by Michael Guiry.

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

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..

Verification of Data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=47452

Citing AlgaeBase
Cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 28 June 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 07 May 2024