Ochtodes J., 1872
Lectotype species: Ochtodes filiformis (J.Agardh) J.Agardh
Currently accepted name for the type species: Ochtodes secundiramea (Montagne) M.Howe
Original publication:Agardh, J.G. (1872). Bidrag till Florideernes systematik. Lunds Universitets Års-Skrift, Afdelningen for Mathematik och Naturvetenskap 8(6): 1-60.
Type designated in Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.
Description: Plants reach 17 cm in height, are erect from a discoid base, and consist of irregularly branched, cylindrical axes derived from 2 prominent helicoid apical cells, the torque of the spirally contorted apical cells gives rise to an internal, double helical biaxis which bears lateral branches which form the cylindrical thallus. Some of the terminal, surface cells of the lateral branches are the initials that divide simultaneously to form the raised patches of the thallus called nemathecial sori. All the reproductive structures develop within these sori. Cortical gland cells are present. Carpogonial branches are 3-4-celled, the basal cell being conspicuously enlarged, and 3-4-celled auxiliary cell branches are formed on separate nemathecial filaments in positions apparently homologous to carpogonial branches. The cell proximal to the elongated, basal cell of the auxiliary branch functions as the auxiliary cell. Following fertilization, all cells of the carpogonial branch fuse. An ephemeral connecting filament of broad and irregular outline issues in 1 or 2 lateral planes from the upper part of the fusion cell, or else a short bridge forms between the carpogonium and an immediately adjacent auxiliary cell. The genus thus been described as both procarpic and non-procarpic on the same thallus. Numerous gonimoblast initials and filaments arise thallus-outwardly from a prominent lateral protrusion on the auxlilary cell and develop thallus outwardly, the carposporophyte consisting of numerous lobes consisting almost entirely of carposporangia encased in a prominently protuberant pericarp. Fusion cells and fusions between gonimoblast and gametophyte tissue are lacking. Spermatangia and tetrasporangia are formed in nemathecial sori. Spermatangia were described by Joly & Ugadim (1966) on plants of O. secundiramea from Brazil. Tetrasporangia are 5.5-6.5 x 28-32 µm and regularly zonately divided in O. crockeri (Setchell & Gardner 1937) and 7.6 µm wide and 22.8 µm long and obliquely zonate to nearly cruciately divided in O. secundiramea (Joly & Ugadim 1966).
Information contributed by: G.T. Kraft, D.R. Wiseman & M.D. Guiry. The most recent alteration to this page was made on 4 Nov 2011 by M.D. Guiry.
Comments: The vegetative and reproductive structure of Ochtodes have been detailed by Wiseman (1976, 1977). The generitype is from Martinique, West Indies and is recorded from Brazil, whereas a second species, O. crockeri Setchell & N.L. Gardner, is from the Galapagos Islands. Specimens from the Pacific Coast of Panama have been tentatively identified as O. crockeri (Littler & Litter, pers. comm.
Numbers of names and species: There are 6 species names in the database at present, of which 5 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.
Joly, A.B. & Ugadim, Y. (1966). The reproduction of Ochtodes secundiramea (Montagne) Howe (Gigartinales, Rhizophyllidaceae). Boletim do Instituto Oceanográfico 15: 55-64.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42494
Please cite this record as:
Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 September 2018.