Hemidinium F.Stein, 1878

Holotype species: Hemidinium nasutum F.Stein

Original publication and holotype designation: Stein, F. von (1878). Der Organismus der Infusionsthiere nach eigenen forschungen in systematischere Reihenfolge bearbeitet. III. Abtheilung. Die Naturgeschichte der Flagellaten oder Geisselinfusorien. I. Hälfte, Den noch nicht abgeschlossenen allgemeinen Theil nebst erklärung: Der sämmtlichen Abbildungen enthaltend. pp. i-x, 1-154, pls I-XXIV. Leipzig: Verlag von Wilhelm Engelmann.

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Description: Cells rounded-elliptical in ventral view, asymmetric, more or less flattened dorsoventrally. Cingulum extends from the mid-ventral region towards the left side, terminating on the mid-dorsal side. Sulcus restricted to the hypocone, sometimes difficult to see. Amphiesmal plates not visible with the light microscope, and not staining with calcofluor. Chloroplasts discoid, in the peripheral part of the cell, sometimes connected to a central, compound pyrenoid. Cell division by fission in the motile stage. Resting cysts spherical.

Information contributed by: Moestrup & Calado (2018). The most recent alteration to this page was made on 2018-10-25 by M.D. Guiry.

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

Most recent taxonomic treatment adopted: Moestrup, Ø. & Calado, A.J. (2018). Süßwasserflora von Mitteleuropa. Dinophyceae. Vol. 6 pp. [i]-xii, [1]-560, 421 figures. Berlin: Springer Spektrum.

Comments: Moestrup & Calado (2018: 331) note, "Due to the confusion regarding the difference between Hemidinium and Gloeodinium, the taxonomy is presently in a chaotic state and the majority of species in the following list require careful examination before their taxonomy, phylogenetic affinity, distribution and ecology can begin to be understood. Many species were described incompletely and have never been refound. We have included below only species that we believe may be possible to identify. Skvortsov (1958, 1968) described a series of new Hemidinium species from eastern Asia, but all descriptions are so incomplete that identification to species level appears to be impossible."

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=43628

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 25 October 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024