156,980 species and infraspecific names are in the database, 22,046 images, 60,683 bibliographic items, 451,446 distributional records.

Geniculus Prescott, 1967

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Streptophyta infrakingdom
Phylum Charophyta
Class Zygnematophyceae
Subclass Zygnematophycidae
Order Zygnematales
Family Mesotaeniaceae

Holotype species: Geniculus gatunensis Prescott

Original publication and holotype designation: Prescott, G.W. (1967 '1966'). Algae of the Panama Canal and its tributaries - II. Conjugales. Phykos 5: 1-49, 12 pls.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.

Description: Cells small, short-cylindric with truncate ends (10-12 um long, 6-8 µm ), bent (geniculate) in middle, with 1-2 fine gelatinous spines on corners of one or both apices (or, in one cell illustrated by author, from middle of cell). Cells in colonies, 8-16 cells within common, triangular, sheath. One or two chloroplasts per cell, axial and stellate with central pyrenoid. Nothing known regarding reproduction in this genus. Placement in Mesotaeniaceae considered tentative by Prescott; confirmation of taxonomic position awaits further studies. Geniculus known only from type locality, Gigante Bay, Gatun Lake (Panama Canal). Cells small, short-cylindric with truncate ends (10-12 um long, 6-8 µm ), bent (geniculate) in middle, with 1-2 fine gelatinous spines on corners of one or both apices (or, in one cell illustrated by author, from middle of cell). Cells in colonies, 8-16 cells within common, triangular, sheath. One or two chloroplasts per cell, axial and stellate with central pyrenoid. Nothing known regarding reproduction in this genus. Placement in Mesotaeniaceae considered tentative by Prescott; confirmation of taxonomic position awaits further studies. Geniculus known only from type locality, Gigante Bay, Gatun Lake (Panama Canal).

Information contributed by: J.F. Gerrath. The most recent alteration to this page was made on 7 May 2013 by M.D. Guiry.

Numbers of names and species: There is only one species or infraspecific name in the database at present, which has 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.

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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: 30 January 2004 by M.D. Guiry

Verified by: 07 May 2013 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=47154

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 13 December 2019.

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