163,924 species and infraspecific names are in the database, 22,783 images, 63,106 bibliographic items, 484,278 distributional records.

Crucigeniella Lemmermann, 1900, nom. illeg.

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Trebouxiophyceae
Order Chlorellales
Family Oocystaceae

Holotype species: Crucigeniella lunaris Lemmermann

Currently accepted name for the type species: Crucigenia lunaris (Lemmermann) Wille

Original publication and holotype designation: Lemmermann, E. (1900). Beiträge zur Kenntnis der Planktonalgen. X. Diagnosen neuer Schwebalgen. Berichte der deutsche botanischen Gesellschaft 18: 306-310.
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Precise date of publication28 August 1900

Taxonomic status: currently regarded as a synonym of Crucigenia.

Most recent taxonomic treatment adopted: Tsarenko, P.M. (2011). Trebouxiophyceae. In: Algae of Ukraine: diversity, nomenclature, taxonomy, ecology and geography. Volume 3: Chlorophyta. (Tsarenko, P.M., Wasser, S.P. & Nevo, E. Eds), pp. 61-108. Ruggell: A.R.A. Gantner Verlag K.-G..

Nomenclatural notes
Illegitimate, not Crucigeniella Gaillon, 1833. - (13 Sep 2010) - M.D. Guiry

Taxonomic notes
According to Hegewald et al. (2010: 325), Crucigeniella has been transferred to the Trebouxiophyceae. - (13 Sep 2010) - Wendy Guiry

Description: Thalli colonial, forming 4-celled, mostly rhomboid coenobia in one plane; compound colonies to 16-cells formed; colonies embedded in structureless mucilaginous envelope. Coenobia with long axes of cells in surface view. Cells oval to cylindrical to lunate, 4-15 x 2-7.5 µm, slightly to conspicuously asymmetric or irregular in outline. Cell walls smooth, often with thickenings at ends or where cells adjoining; remnants of sporangial walls often remaining visible in colony. Cells uninucleate; single chloroplast cup-shaped and parietal, with or without pyrenoid. Asexual reproduction by autospores; 4 spores per sporangium, organized into coenobia and released by rupture and dissolution of sporangial walls. Remnants of sporangial walls rarely distinct in compound colonies. According to Flint and Bullock (1976) only inner cell wall gelatinizes. Flagellated stages and sexual reproduction unknown.

Information kindly contributed by D.J. Garbary and E. Hegewald but may now be outdated.

Comments: Crucigeniella planktonic in freshwater; mostly known from Europe and North America, with species recorded from South America, New Zealand and Africa. Genus distinguished biochemically from the morphologically similar Crucigenia and Tetrastrum by the absence of the rare polyamine norspermine and by the presence of high concentrations of norspermine which was also found in a related genus. Species distinguished based on details of cell size and shape and details of wall thickening.
The genus name is a later homonym of Crucigeniella Gaillon, and is unfortunately illegitimate.

Numbers of names and species: There are 15 species names in the database at present, as well as 1 infraspecific names. Of the species names, 2 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.

References
Hegewald, E., Wolf, M., Keller, A. Friedl, T. & Krienitz, L. (2010). ITS2 sequence-structure phylogeny in the Scenedesmaceae with special reference to Coelastrum (Chlorophyta, Chlorophyceae), including the new genera Comasiella and Pectinodesmus. Phycologia 49(4): 325-335.

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.

Created: 11 April 2002 by M.D. Guiry

Verified by: 20 December 2011 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43469

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 October 2021.

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