Treubaria C.Bernard, 1908
Holotype species: Treubaria triappendiculata C.Bernard
Original publication and holotype designation: Bernard, C. (1908). Protococcacées et desmidiées d'eau douce, récoltées à Java. pp. [i]–v, [1]–230, 16 plates. Batavia: Landsdrukkerij.
Request PDFDescription: Unicellular, microscopic plants with spherical to polygonal to triradiate to multilobate protoplasts, 5-22 µm diameter, with (2-) 3-4 (-20) pointed, hollow, conical (tubular sometimes in T. crassispina) spines, 6-83 µm long, sometimes with very broad base. Cell walls smooth, ultrastructurally with wall microfibrils showing regions of inderdigitation between spines. Cells uninucleate when young, to four or more when mature; chloroplast one when young, cup-shaped and parietal; pyrenoid single in young cells to more when mature, penetrated with conspicuous network of cytoplasmic invaginations and with thylakoids never traversing starch cap. Asexual reproduction by autospore formation, 4 per parental cell, and by 2-4(-8) naked zoospores with four flagella (observed in one species). Spores released by splitting of parental cell wall into several pieces (each with a spine) or only by formation of one slit; mode of spore release depends on cell morphology: splitting in several pieces more common in cells with a few long and broad spines. The spore release patterns should not be used to distinguish genera (i.e. Treubaria and Echinosphaerella as proposed by some authors) or species. Sexual reproduction unknown.
Information contributed by: O.L. Reymond & D.J. Garbary. The most recent alteration to this page was made on 2012-03-07 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: John, D.M. & Tsarenko, P.M. (2002). Order Chlorococcales. In: The Freshwater Algal Flora of the British Isles. An identification guide to freshwater and terrestrial algae. (John, D.M., Whitton, B.A. & Brook, A.J. Eds), pp. 327-409. Cambridge: Cambridge University Press.
Comments: Culture studies indicate requirements for Vitamins B1 and B12. Treubaria planktonic in freshwater; cosmopolitan. During spine development cytoplasm projects first into narrow finger-like spine in the first stages of elongation and then withdraws into the protoplast when spine cone broadens. Spine base with specialized 'collar' during elongation and broadening. Cell division similar to other coccoid greens but with long delay between phycoplast formation and onset of furrowing. Treubaria differs from other spine-bearing Chlorococcales (i.e. Pachycladella) in that the processes and cell wall form an indissociable network. In nature as well in culture cells occasionally have numerous spines (up to 20 or more), explained as follows: a three-spined cell sometimes releases its cell wall-spine complex (often after mitosis but without cytokinesis) and forms a new one with more spines. Several successive changes give the cell a spherical shape with many radiating spines. When division occurs, spores again have a small number of spines.
The current generic concept excludes T. elegans, T. quadrispina, T. umbrina and T. umbrina f. zatoriensis, and Echinosphaerella is a likely synonym of Treubaria. The chrysophycean Bitrichia ollula and the chlorophycean Tetraedron raphidioides f. tridins can be mistaken for Treubaria.
Species are distinguished based on protoplast shape, and length, number and morphology of spines. All species highly polymorphic and this has resulted in multiple descriptions of identical species under different names. Species concepts need further clarification (see Reymond 1980).
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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=43451
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 07 March 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 November 2024
