Actinotaenium (Nägeli) Teiling, 1954

Holotype species: Dysphinctium regelianum Nägeli

Currently accepted name for the type species: Actinotaenium curtum (Brébisson ex Ralfs) Teiling ex Růžička & Pouzar

Original publication and holotype designation: Teiling, E. (1954). Actinotaenium, genus desmidiacearum resuscitatum. Botanisk Notiser 4: 376-426.

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Description: Cell solitary, short to elongate, fusiform to cylindric, with broadly rounded or truncate ends and shallow median constriction (isthmus) where semicell walls overlap. Cell wall smooth or with conspicuous scattered pores or scrobiculations. Chloroplast one per semicell, stellate in end view, with central pyrenoid (rarely 2-3 in axial row). Nucleus in isthmus between chloroplasts. Asexual reproduction by cell division typical of Cosmarium-type desmids (see Cosmarium). Sexual reproduction by conjugation known for several species. Zygotes between gametangia; gametangial walls often attached to corners of quadrate zygospores. Mature zygospores spherical to quadrate with smooth walls, or spherical to subspherical with broad mamillate protuberances or sharp spines. Paired zygospores known in some species (e.g. A. diplosporum). Actinotaenium cosmopolitan, several widespread species; usually in acidic, oligotrophic lakes and ponds or Sphagnum bogs.

Information contributed by: J.F. Gerrath. The most recent alteration to this page was made on 2024-01-18 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43522

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 18 January 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024