Transeauina Guiry, 2013

Holotype species: Transeauina glyptosperma (De Bary) Guiry

Original publication and holotype designation: 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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Description: Thalli unbranched, forming extensive skeins of intertwining uniseriate filaments. Cells cylindrical 6-30 µm in diameter, several times as long; cell wall two-layered with inner cellulose, outer mucilage layer; endwalls plane; no flagellated stages. Cells uninucleate; chloroplasts axile; flat ribbonlike or platelike; one or two per cell; pyrenoids in row or scattered. Asexual reproduction by fragmentation, akinetes, parthenospores, and aplanospores. Life cycle haplobiontic, meiosis zygotic. Sexual reproduction by scalriform conjugation; gametes isogamous, fuse within conjugation tube. Zygospores distinctly tricarinate with three keels, or sharp edges. Filaments usually found as free-floating masses.

Information contributed by: R.W. Hoshaw and R.M. McCourt [as Debarya Wittrock].. The most recent alteration to this page was made on 2013-11-17 by Salvador Valenzuela Miranda.

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.

Comments: All species rare, but collected from Eruope, Asia, North America, and New Zealand. Earliest fossil zygospores reported from Permian Period (250 million years b.p.); in contrast to modern distribution, fossil keeled spores quite common in sediments where Zygnemataceae found, especially in cold or cool climates in high-mountain treeless plains (paramos) of Colombian Andes; used as marker for clean, oxygen-rich, shallow stagnant, mesotrophic water in habitats subject to seasonal warming. Originally D. glyptosperma described as a species of Mougeotia; Transeuina may be related to latter. Trait of conjugation places in Zygnematales but otherwise phylogenetic position unclear.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=51491

Citing AlgaeBase
Cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 17 November 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 01 December 2024