Irkutia Pomazkina, Rodionova & Sherbakova, 2019

Holotype species: Irkutia dispersepunctata (Skabichevskij) Pomazkina & Rodionova

Original publication and holotype designation: Pomazkina, G.V., Rodionova, E.V. & Sherbakova, T.A. (2019). Validation of 123 names of new diatom taxa from Lake Baikal. Limnology and Freshwater Biology 2019(1): 181-198.

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Description: Cells biraphid, valves isopolar, "naviculoid". Characters of the chloroplast is not yet known. Valves linear to linear–elliptic. Ends slightly protracted, cuneate and obtusely rounded. Raphe filiform, weakly lateral, with fine central endings and long widely rounded to the same side terminal fissures. Striae slightly radiate, punctate. Central raphe endings slit-like with small pores slightly deflected to the primary side (with an exception of Irkutia baicalensis Pomazkina, Rodionova & Sherbakova with short proximal endings abruptly bent contrary). Terminal raphe fissures hooked, both bent in the direction opposite to proximal endings. Striae punctate, slightly radiate, composed of irregular large transapically widened oval areolae. Axial area broad, linear; central area slightly asymmetrically expanded. Axial and central areas are encircled by a row or rows of larger rounded or oval areolae. Internal proximal raphe endings slit-like, short, bent in the same side; distally, the raphe ends with helictoglossae.

Origin of description: this description is from the original publication; it may have been modified slightly. The most recent alteration to this page was made on 2020-01-06 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.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=52742

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 January 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 18 May 2024