Euthora J., 1847: 11
Holotype species: Euthora cristata (C.Agardh) J.Agardh
Original publication and holotype designation:Agardh, J.G. (1847). Nya alger från Mexico. Öfversigt af Kongl. Vetenskaps-Adademiens Förhandlingar, Stockholm 4: 5-17.
Taxonomic status: currently recognized as a distinct genus.
Description: Flat, narrow, subdichotomously branched to five or more orders. Ultimate branches irregularly alternate to pinnate, terminating in acute apices; narrow marginal proliferations sometimes present. Medulla of large isodiametric cells mixed with small-celled filaments derived from primary medullary and inner cortical cells. Cortical cells isodiametric, progressively smaller toward cuticle. Dioecious. A single 3-celled carpogonial branch borne on supporting cell, usually with one subsidiary cell. Supporting cell serving as auxiliary cell. Carposporangia in groups, separated by gonimoblast filaments. Cystocarp protuberant, with poorly developed carpostome. Spermatangia superficial. Tetrasporophyte isomorphic. Tetrasporangia cruciate or irregular, scattered in cortex.
Comments: Cool temperate North Atlantic and North Pacific Oceans; Arctic Ocean.
NCBI Nucleotide Sequences
Numbers of names and species: There are 10 species (and infraspecific) names in the database at present, of which 2 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):
Euthora cristata (C.Agardh) J.Agardh C - type
Euthora cristata f. pinnata Kjellman C
Euthora cristata f. angustata (Lyngbye) Kjellman S
Euthora fabriciana (Lyngbye) J.Agardh S
Euthora fruticulosa (Ruprecht) J.Agardh S
Euthora gunnii J.Agardh S
Euthora marginifera Areschoug S
Euthora membranacea (Harvey) J.Agardh S
Euthora timburtonii Clarkston & G.W.Saunders C
Euthora tristanensis Baardseth C
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42637
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 08 December 2013.
Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:7589