Triploceras Bailey, 1851
Lectotype species: Triploceras verticillatum (Bailey) Bailey
Original publication: Bailey, J.W. (1851). Microscopical observations made in South Carolina, Georgia and Florida. Smithsonian Contributions to Knowledge 2(8): 1-48, 3 plates.
Request PDFType designated in: Guiry, M.D. (2013). Taxonomy and nomenclature of the Conjugatophyceae (=Zygnematophyceae). Algae. An International Journal of Algal Research 28: 1-29.
Description: Cells solitary, elongate-cylindric with shallow median constriction (isthmus) where semicells overlap, and several whorls of mamillate protuberances, each bearing one or more short spines. Cell ends truncate and 2-4-furcate, usually with two spines on each apical process. One axial chloroplast per semicell, stellate in end view, with axial row of pyrenoids. Nucleus in isthmus. Asexual reproduction by cell division and new semicell morphogenesis typical of Cosmarium-type desmids (see Cosmarium). Chloroplast divides only after new semicell completed. Sexual reproduction by homothallic and heterothallic conjugation. Gametangia pair within mucilage envelope; become geniculate when conjugation papilla forms at isthmus. Gametes fuse between gametangia; mature zygospore spherical with long, furcate spines. Zygospores from heterothallic cross have fewer, stouter, more furcate spines than from homothallic cross. Zygospore germination by wide circular operculum. Meiosis after extrusion of germination vesicle, producing one gone with Cosmarium-like morphology. Triploceras semicell morphology formed by new semicells at next cell division, resulting in markedly asymmetric cells. Each cell then produces new Triploceras-type semicell (without mitosis) and the cosmarioid semicell is discarded. Triploceras verticillatum and T. gracile widespread, usually in acidic, oligotrophic lakes and ponds. T. splendens rare, known only from Malaysia and North Australia. C
Information contributed by: J.F. Gerrath. The most recent alteration to this page was made on 2018-04-24 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as neuter.
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.
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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.
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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 24 April 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024
