Esoptrodinium P.Javornicky, 1997

Holotype species: Esoptrodinium gemma Javornicky

Original publication and holotype designation: Javornicky, P. (1997). Bernardinium Chodat (Dinophyceae), an athecate dinoflagellate with reverse, right-handed course of the cingulum and transverse flagellum, and Esoptrodinium genus novum, its mirror-symmetrical pendant. Archiv für Hydrobiologie Supplement 122 (Algological Studies 87): 29-42.

Description: Small (20-30 &m long) free-living obovate unicellular flagellates, laterally compressed. Transverse furrow starts ventrally in the middle of the cell, turns to the left and fades away at the dorsal side, making only half a turn. Transverse flagellum very short, encircling only half of the cell. Sulcus very faint or absent, longitudinal flagellum about 1.5 body length. Cell wall somewhat rigid but smooth, no visible surface markings under light microscopy. Chloroplast absent (type species) or present; species without chloroplasts phagotrophic, stigma present (type species) or absent. Nucleus ovoid without visible structure. Sexual reproduction not observed. Habitat : Rarely reported from freshwater ponds in Germany, Czechoslovakia and USA; two other species, transferred from Hemidinium Stein, from brackish waters. Species now included in Esoptrodinium had been misidentified as Bernardinium Chodat in Chodat and Zender, as the original description and figures of that genus were regarded as side-reversed. Indeed, Esoptrodinium is the mirror-symmetrical pendant to Bernardinium, in which transverse flagellum and cingulum are turning to the right, in contrast to normal dinoflagellate morphology. Species of the morphological similar genus Hemidinium Stein have thecal plates, thus belonging to the Peridiniales.

Information contributed by: M. Elbrächter. 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: 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.

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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=45489

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 26 April 2024