Chakia J.Komárková, E.Zapomelová & J.Komárek, 2013
Holotype species: Chakia ciliosa Komárková, Zapomelová & Komárek
Original publication and holotype designation: Komárková, J., Zapomelová, E. & Komárek, J. (2013). Chakia (cyanobacteria), a new heterocytous genus from Belizean marshes identified on the basis of the 16S rRNA gene. Fottea 13(2): 227-233.
Request PDFDescription: Thalli live solitary or in small clusters among other algae and cyanobacteria. Simple filaments are heteropolar with a basal heterocyte, later simply Tolypothrix-type false branching, rarely binary falsely branched, up to forming creaping isopolar filaments with numerous types of false branching. Filaments cylindrical, usually slightly widened towards ends (also narrowed when forming hormogonia); in narrow parts only (9.8-)13.6-16 µm wide, later, especially at the ends up to 30 µm wide. Almost cylindrical filaments can also occur. Sheaths are of different width. When thick, they are densely lamellate, colorless up to yellowbrown mostly in inner parts, outer layers remain often colorless, sometimes partly with calcareous incrustations. Trichomes are uniseriate, of variable width, composed of variously shaped cells. Cells in some parts clearly constricted at cross walls, in terminal parts usually not constricted, sometimes clublike widened, terminal cells rounded. The width of young trichomes ranges from 6 to 10.5 µm, in apical and clubshaped widened segments elder trichomes can be up to 12.4 µm wide. Cells in younger parts are usually barrelshaped or almost spherical, isodiametric or slightly shorter or longer than wide, in middle parts cylindrical and up to twice as long as wide, and at the ends usually cylindrical and often shorter than wide, bright bluegreen. Heterocytes are basal in young germinating filaments, hemispherical or almost spherical, later ovoid, oval or cylindrical, 7.4-22.3 × 5-12.4 µm in diameter. In well developed filaments the heterocytes are spread irregularly between vegetative cells. Akinetes absent; reproduction by hormogonia and usually 14-celled hormocytes with densely lamellate, yellow-brown sheaths. Germination of hormocytes proceeds without the heterocyte which appears later during growth of a new filament.
Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 2023-03-06 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 feminine.
Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.
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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=51514
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024
