Hemitoma Skuja, 1939

Holotype species: Hemitoma maeandrocystis Skuja

Original publication and holotype designation: Skuja, H. (1939). Beitrag zur Algenflora Lettlands II. Acta Horti Botanici Universitatis Latviensis 11/12: 41-169.

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Description: Unicellular,biflagellate and uninucleate algae with protoplast contained in a firm,ellipsoid, broadly ellipsoid or globose lorica. Lorica 13-15 umwide, rather hyaline in young cells, becoming impregnated with iron, itsdeposition pattern giving lorica surface a reticulate appearance.Although indistinct in vegetative cells, lorica with a transverse,circumferential fissure line at midregion. The fissure becomes evidentduring division when lorica separates to release daughter cells. Flagellaanterior in cell and emerge through lorica from separate openings.Protoplast with same shape as lorica and almost completely filling it.Chloroplast principally cup-shaped with an anterior stigma and nopyrenoid. Two contractile vacuoles present near base of flagellaAsexualreproduction by division into 2 or 4 daughter cells. Daughter cellsinitially contained within a common mucilage vesicle which elongates as the twoportions of the mother cell lorica separate. The vesicle eventuallybursts releasing daughter cells with initially indistinct loricas. Thesurface reticulum on the lorica more evident as cells mature.Aplanospores produced; sexual reproduction unknown.

Information contributed by: G.E. Dillard. The most recent alteration to this page was made on 2012-06-29 by Michael Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Bourrelly, P. (1990). Les algues d'eau douce. Initiation à la systématique. Tome I: Les Algues vertes. pp. 1-572. Paris: Société Nouvelle des Éditions Boubée.

Comments: Hemitoma> infrequently encountered, known only from freshwater in Latvia and Sweden

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=44229

Citing AlgaeBase
Cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 29 June 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 December 2024