153,822 species and infraspecific names are in the database, 21,012 images, 59,572 bibliographic items, 413,461 distributional records.

Avrainvillea Decaisne, 1842

Classification:
Empire Eukaryota
Kingdom Plantae
Subkingdom Viridiplantae
Infrakingdom Chlorophyta infrakingdom
Phylum Chlorophyta
Subphylum Chlorophytina
Class Ulvophyceae
Order Bryopsidales
Family Dichotomosiphonaceae

Holotype species: Avrainvillea nigricans Decaisne

Original publication and holotype designation: Decaisne, J. (1842). Mémoire sur les corallines ou polypiers calcifères [la seconde partie du "Essais sur une classification des algues et des polypiers calcifères de Lamourous"]. Annales des Sciences Naturelles, Botanique, Seconde Série 18: 96-128.
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Precise date of publicationAugust 1842

Taxonomic status: currently recognized as a distinct genus.

Taxonomic notes
Curtis et al. (2008) question the placement of this genus in the family Udoteaceae. - (30 Oct 2008) - Wendy Guiry

Description: Thallus is composed of one or more stipitate blades arising from well-developed submerged or emergent holdfasts. Blade, stipe and holdfast can be reduced or modified in different species. Stipe can be solitary, unbranched and bearing a single terminal blade, or branched one to many times with each branch bearing a single terminal blade. Blades are usually flabellate, 2-30 cm. tall (including stipe), never calcified, variably zonate, composed of true non-septate siphons. Siphons are tightly or loosely consolidated, dichotomously branched, and lack lateral branchlets. Siphons may be cylindrical, tortuous, torulose or moniliform either exclusively or in combination; dichotomal constrictions deep or shallow; apices rounded, pointed, threadlike, hooked or clavate. Life history of Avrainvillea has not been experimentally verified, but is believed to be similar to other udoteacean genera, i.e. a dioecious diploid erect thallus in which meiosis precedes gametogenesis. Thalli are holocarpic. Vegetative propagation is more common and constant throughout the year. Turnover times of 4-6 weeks have been observed in some species. Time between disappearance of old blade and development of new one can be as little as 48 h. Rhizomatous portion of thallus may represent up to 90% of thallus and should be considered more than just a holdfast.

Information contributed by: J. L. Olsen. The most recent alteration to this page was made on 29 Aug 2011 by M.D. Guiry.

Comments: Geographical distribution is pantropical to subtropical (Hawaii, Mediterranean and Australia) with some regional endemism. It is common on sand plains, coral rubble and in seagrass beds; reported to -60m.

Numbers of names and species: There are 36 species names in the database at present, as well as 10 infraspecific names. Of the species names, 30 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.

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: 28 December 2000 by M.D. Guiry

Verified by: 29 August 2011 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=36011

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 12 December 2018.

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