Haplotaenium Bando, 1988: 176
Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Charophyta
Class Conjugatophyceae
Order Desmidiales
Family Desmidiaceae
Holotype species: Haplotaenium minutum (Ralfs) Bando
Original publication and holotype designation:Bando, T. (1988). Haplotaenium, a new genus separated from Pleurotaenium (Desmidiaceae, Chlorophyta). Journal of Japanese Botany 65(3): 169-178, 4 figs.
Precise date of publicationMay 20 1988
Taxonomic status: currently recognized as a distinct genus.
Description: Cell solitary, elongate-cylindric with shallow median constriction (isthmus) where semicell walls overlap. Semicells with slight basal swelling and smooth, truncate apex. Cell apex without terminal vacuole. Cell wall appearing smooth or finely porose. Chloroplast two per cell, each an axial band or with irregular laminae, with central row of 2-15 pyrenoids. Nucleus in isthmus. Asexual reproductin by cell division and new semicell morphogenesis typical of Cosmarium-type desmids (see Cosmarium). Sexual reproduction by conjugation. Gametes fuse between gametangia; zygospores globose, smooth or with obtuse conical protruberances. Karyogamy prior to zygospore germination, followed by meiosis. Two species widespread, usually in acidic, oligotrophic lacustrine environments or in swamps. Cell solitary, elongate-cylindric with shallow median constriction (isthmus) where semicell walls overlap. Semicells with slight basal swelling and smooth, truncate apex. Cell apex without terminal vacuole. Cell wall appearing smooth or finely porose. Chloroplast two per cell, each an axial band or with irregular laminae, with central row of 2-15 pyrenoids. Nucleus in isthmus. Asexual reproductin by cell division and new semicell morphogenesis typical of Cosmarium-type desmids (see Cosmarium). Sexual reproduction by conjugation. Gametes fuse between gametangia; zygospores globose, smooth or with obtuse conical protruberances. Karyogamy prior to zygospore germination, followed by meiosis.
Comments: Two species widespread, usually in acidic, oligotrophic lacustrine environments or in swamps.
NCBI Nucleotide Sequences
Numbers of names and species: There are 14 species (and infraspecific) names in the database at present, of which 3 have been flagged as currently accepted taxonomically.
Names: ('C' indicates a name that is currently 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):
Haplotaenium bourrellyi (Grönblad & Scott) Bando S
Haplotaenium indentatum var. latius Kouwets C
Haplotaenium indentatum Kouwets C
Haplotaenium minutum var. alpinum (Raciborski) Gutwinski C
Haplotaenium minutum var. crassum (West) Cambra C
Haplotaenium minutum var. gracile (Wille) Bando C
Haplotaenium minutum var. elongatum (West) Bando C
Haplotaenium minutum (Ralfs) Bando C - type
Haplotaenium minutum var. maius P.Lundell C
Haplotaenium rectum var. foesteri f. elongatum D.B.Williamson C
Haplotaenium rectum var. foersteri T.Bando P
Haplotaenium rectum f. elongatum D.B.Williamson P
Haplotaenium rectum var. foesteri T.Bando C
Haplotaenium rectum (Delponte) Bando C
References
Hall, J.D., Karol, K.G., McCourt, R.M. & Delwiche, C.F. (2008). Phylogeny of the conjugating green algae based on chloroplast and mitochondrial nucleotide sequence data. Journal of Phycology 44: 467-477.
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: http://www.algaebase.org/search/genus/detail/?genus_id=44292
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 20 June 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:6497
