Pandorina Bory, 1824
Lectotype species: Pandorina morum (O.F.Müller) Bory
Original publication:Lamouroux, [J.V.F.], Bory de Saint-Vincent, [J.B.] & Eud[es]-Deslongchamps, [J.A.] (1827). Encyclopédie méthodique ou par ordre de matières. Histoire naturelle des zoophytes, ou animaux rayonnés, faisant suite à l'histoire naturelle des vers de Bruguière. Tome Second. pp. 377–819. Paris: Chez Mme veuve Agasse, Imprimeur-Libraire, rue dos Poitevins, no. 6.
Type designated in Ehrenberg, C.G. (1838). Die Infusionsthierchen als vollkommene Organismen. Ein Blick in das tiefere organische Leben der Natur. pp. i-xviii, [1-4], 1-547, , pls I-LXIV. Leipzig: Verlag von Leopold Voss.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Massjuk, N.P. & Lilitska, G.G. (2011). Volvocales. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 218-225. Ruggell: A.R.A. Gantner Verlag K.-G..
Description: Colonies ovoid or ellipsoidal, containing 16 or 32 cells arranged radially in a gelatinous matrix. Cells keystone-shaped, ovoid or spherical, each with two equal flagella, a stigma, two contractile vacuoles at base of flagella, and a massive cup-shaped chloroplast with one basal or multiple pyrenoids (species dependent). Stigmata in anterior cells larger than in posterior cells. Asexual reproduction by autocolony formation, each cell dividing successively to form a plakea, which inverts to become a daughter colony. In sexual reproduction, cells escape from gelatinous matrix to become isogametes, and walled aplanozygotes are formed. Upon germination zygotes give rise to single biflagellate gone cells.
Information contributed by: H. Nozaki & M.D. Guiry. The most recent alteration to this page was made on 25 Jan 2012 by M.D. Guiry.
Comments: Pandorina species are cosmopolitan in freshwater. Twenty sexually isolated groups (syngens) of P. mora were characterized based on hybridization among 70 clones; phylogeny was inferred based on distribution and karyotype. Pandorina was frequently confused with Eudorina because the original description of Pandorina was inadequate to distinguish the two genera. Pandorina is characterized as having contiguous cells in the colony. P. unicocca, however, has 32-celled colonies with non-contiguous cells similar to Eudorina. Pandorina is also distinguished by being isogamous. Based on colony ultrastructure, P. morum is closely related to Volvulina. Only P. morum and P. unicocca have been studied in laboratory culture. Various strains assigned to P. charkowiensis may be referred to P. unicocca (unipyrenoid) or Eudorina elegans (multipyrenoid). Pandorina morum and P. unicocca require no vitamins or other organic compounds, but are capable of mixotrophic growth in light. P. unicocca requires light for mating response, and calcium is necessary for zygote formation. Ultrastructural studies and chemical analyses showed that extracellular (gelatinous) matrix of P. morum was a multilayered structure containing hydroxyproline-rich glycoproteins and sulfated polysaccharide. The matrix of P. mora suggested to be homologous to the cell wall of Chlamydomonas.
Numbers of names and species: There are 16 species names in the database at present, as well as 5 infraspecific names. Of the species names, 7 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.
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: 11 April 2002 by M.D. Guiry
Verified by: 25 January 2012 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43494
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 21 November 2018.