Crucigloea C.J.Soeder, 1978: 306
Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Chlorophyta
Class Chlorophyceae
Order Sphaeropleales
Family Radiococcaceae
Holotype species: Crucigloea crassiseta (Skuja) Soeder
Taxonomic status: currently recognized as a distinct genus.
Description: Microscopic colonies forming a flat plate of cells embedded in slightly stratified mucilage with short to long, strait to curved mucilage projections at each corner to 35 &m long and 3-5 &m wide. Colony outline lobed, to 45 &m long, 30 &m wide and 11-12 &m thick. Cells 3-8 x 4-7 &m, roughly triangular or hemispherical first formed, later becoming more oval but slightly asymmetric. Cells walls smooth and thin. Cells uninucleate with one or two noncontractile vacuoles; chloroplast 1-2 per cell, parietal; pyrenoids absent. Asexual reproduction by colony fragmentation with colony growth by cell division to form new tetrads of cells. Spore production, flagellated stages and sexual reproduction unknown. Crucigloea planktonic in freshwater; reported only from humic, dystrophic lakes in Sweden. The highly characteristic colony morphology suggests that the genus is indeed endemic. . crassiseta var. puella distinguished by slightly smaller cell size and shorter mucilage projections at corners. Genus will require more critical study of reproduction and ultrastructure before affinities can be determined.
Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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):
Crucigloea crassiseta (Skuja) Soeder C - type
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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=47399
Citing AlgaeBase
Cite this record as:
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:5449
