Ankylonoton Pascher, 1932

Holotype species: Ankylonoton pyreniger Pascher

Original publication and holotype designation: Pascher, A. (1932). Über einige neue oder kritische Heterokonten. (Beiträge zur Kenntnis der einheimischen Algenflora. II.). Archiv für Protistenkunde 77: 305-359.

Description: Unicellular, solitary, free-living and motile organisms with slight metaboly. Cells (6-) 7-15, exceptionally up to 22 µm long; (3-) 4-8 µm wide. In lateral view cells with dorsiventral outline, the dorsal part being ellipsoidal and strongly swollen while the ventral portion is slightly convex, and in the anterior third with a conspicuous depression where the 2 flagella are inserted. In dorsal view cells ellipsoidal-to-ovoid with the 2 apices bluntly rounded. Cell walls absent. The 2 flagella oriented toward the front have very different lengths, especially within a species. The largest is up to twice as long as the cell length whereas the smaller is only one quarter the cell length. The single chloroplast parietal and dorsal, cup-shaped and often irregularly lobed at the margins. It appears thin in many places and even sometimes reticulate. In the upper half, in a dorsal position, is a large pyrenoid shaped like a rounded loaf of bread slightly elongated and without starch. Stigma absent. Two contractile vacuoles sometimes present at the base of the flagella. Storage products of oil droplets and lipids. In the motile state, vegetative reproduction by longitudinal fission. During division the pyrenoid can divide or not, producing daughter cells in which one or both cells have pyrenoids. Neither autospores nor palmelloid stages known.

Information contributed by: A. Couté emend. M.D. Guiry. The most recent alteration to this page was made on 2021-10-03 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 masculine.

Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.

Comments: Ankylonoton in drainage ditches or polders in water of variable salinity or in salt marshes; reported only from western and northern Europe. Species based on cell form, especially the morphology of the anterior region, cell and flagellar dimensions and on chloroplast position (ventral or dorsal). Ankylonoton resembles an Ochromonas species in which the cell has lost its yellow-brown color and become yellow green.

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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=44341

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 21 December 2024