06 | 13

Antithamnionella Lyle, 1922: 347

Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Rhodymeniophycidae
Order Ceramiales
Family Ceramiaceae
Subfamily Ceramioideae
Tribe Dohrnielleae

Holotype species: Antithamnionella sarniensis Lyle

Currently accepted name for the type species: Antithamnionella ternifolia (J.D.Hooker & Harvey) Lyle

Original publication:Lyle, L. (1922). Antithamnionella, a new genus of algae. J. Bot. 60: 346-350, 6 figs.

Type designated inKylin, H. (1956). Die Gattungen der Rhodophyceen. pp. i-xv, 1-673, 458 figs. Lund: C.W.K. Gleerups.

Taxonomic status: currently recognized as a distinct genus.

Description: Thallus of uncorticated, monosiphonous, prostrate axes bearing erect branches. Cells with 1-4 determinate branchlets, inconsistent in number per cell and in branching pattern of branchlet. Gland cells lateral and sessile on 2nd-5th cell of branchlet axis or on branches of the branchlet. Procarps, 1-3, borne near branch apices on basal cells of successive branchlets usually reduced to one cell beyond the basal (supporting) cell. The fertilized carpogonium fuses with an auxiliary cell cut off from the supporting cell and carposporophyte development proceeds as in Antithamnion. Spermatangial clusters and sessile, tetrahedral tetrasporangia borne adaxially on rachides of branchlets. Antithamniella has sometimes been included in the genus Antithamnion, but differs in features of branching, position of gland cells, fewer procarps borne on reduced branchlets and tetrahedral division of tetrasporangia. Recent studies on ecology, morphology and reproduction have established A. sarniensis and A. spirographidis as distinct species. Genetic isolation also demonstrated by complete failure of interspecific crossing.

Comments: Widespread often with well-established populations. Epiphytic on algae and on rock or other substrate.

NCBI Nucleotide Sequences

Numbers of names and species: There are 43 species (and infraspecific) names in the database at present, of which 25 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):

References
Choi, H.-G., Kraft, G.T., Kim, H.-S., Guiry, M.D. & Saunders, G.W. (2008). Phylogenetic relationships among lineages of the Ceramiaceae (Ceramiales, Rhodophyta) based on nuclear small subunit rDNA sequence data. Journal of Phycology 44: 1033-1048.

Wynne, M.J. & Schneider, C.W. (2010). Addendum to the synoptic review of red algal genera. Botanica Marina 53: 291-299.

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=33025

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 19 June 2013.

Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:8788

Website Design : 249 Design Studio