Pteromonas Seligo, 1887
Holotype species: Pteromonas aculeata Lemmermann
Original publication:Seligo, A. (1887). Untersuchungen über Flagellaten. Beiträge zur Biologie der Pflanzen 4: 145-178.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Pentecost, A. (2002). Order Volvocales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 303-327. Cambridge: Cambridge University Press.
Description: 170 Unicellular,biflagellate and uninucleate algae with protoplast contained in a firm,strongly compressed lorica with smooth, roughened or spiny surface. Innarrow side view, lorica obviously consists of two equal sections with contactmargins closely adpressed and sometimes raised, forming an indistinctkeel. In broad front view, lorica globose or oval, with entire, angled orundulate lateral margins. Anterior end rounded or slightly retuse, orsubrectangular and with or without distinct extensions at the angles. In verticalview, protoplast usually in close contact with outer margins of lorica, thelorica with straight or curved projections extending beyond each pole. Inbroad front view, protoplast not in close contact with lorica except atanterior end. Protoplast pyriform, ovoid or globose, andcompressed. Flagella emerge from separate openings at anterior oflorica. Chloroplast principally cup-shaped with 1-severalpyrenoids and usually with a stigma. Two contractile vacuoles present atbase of flagella.Asexualreproduction by division into 2 or 4 daughter cells, these released uponseparation of two halves of mother cell lorica. Akinetes reported.Sexual reproduction isogamous, producing a quadriflagellate planozygote.Mature zygote globose, with a thickened, usually smooth wall. Meiosisapparently zygotic.
Information contributed by: G.E. Dillard. The most recent alteration to this page was made on 7 May 2015 by Salvador Valenzuela Miranda.
Comments: Pteromonas is cosmopolitan in freshwater. Individualspecies generally infrequently encountered and, in many cases, known only fromtype localities. Eighteen species are well described and distinguishedbased on position and relative size and shape of the lorica wings, the shape ofthe lorica in outlie, the form of ornamentation, if any, of the lorica and thenumber and relative position of the pyrenoids. Over 25 additional speciesdescribed, mostly by Skvortzow; in most cases, descriptions quite incomplete,and species of doubtful taxonomic validity.Withlight microscopy, lorica of Pteromonas spp. appears as an opaque,generally U-shaped wing. Ultrastructurally, lorica of P. tenuisBelcher et Swale and P. angulosa (Carter) Lemmermann double layered,with each layer marked with a pattern of denser, slightly raised ridgesenclosing more or less hexagonal areas. In P. protracta Lemmermann(suggested for synonymy with P. aculeata Lemmermann by Ettl) lorica composedof two layers, a finely granular outer layer with hexagonal surface pattern andan inner fibrillar layer.G. E. Dillard
Numbers of names and species: There are 39 species names in the database at present, as well as 18 infraspecific names. Of the species names, 23 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: 07 May 2015 by Salvador Valenzuela Miranda
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43460
Please cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 25 March 2019.