Histioneis Stein, 1883

Holotype species: Histioneis remora F.Stein

Original publication and holotype designation: Stein, F. von (1883). Der Organismus der Infusionsthiere nach eigenen forschungen in systematischere Reihenfolge bearbeitet. III. Abtheilung. II. Hälfte die Naturgeschichte der Arthrodelen Flagellaten. pp. 1-30, pls I-XXV. Leipzig: Verlag von Wilhelm Engelmann.

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Description: Medium-sized to large (30-150 µm) flagellate with elaborate to bizarre wings and lists. Cell body divided by large cingular lists into a small to very much reduced epicone, nearly flat to rather strongly vaulted, and a larger ovoid to naviculoid hypocone as seen from the lateral side. Only in very few species the hypocone forms a conspicuous antapical horn. Many species are laterally very much compressed. As the epicone is small, the circular cingulum is always displaced to the anterior part of the cell. The hypothecal cingular lists are bent to the longitudinal axis extending to the apex, forming a wide cylinder. In some species the dorsal and ventral width is equal or subequal, in others it may be much higher dorsally than ventrally. The epithecal cingular lists also are bent to the longitudinal axis, closed and funnel-shaped resulting in a large chamber between the hypothecal and epithecal cingular lists. In this chamber phaeosomes occur, namely photosynthetic symbiotic unicellular bluegreens of the genus Synechococcus. The sulcal lists are very elaborate. The function of these lists is unknown, as living specimens have been reported to be embedded in large ovoid mucus beds. Several species show a green autofluorescence of their cytoplasm, excited by UV-light. Sexual reproduction and cyst formation not known. The biology of these organisms also is poorly known. Ultrastructural observations showed that apparently some of the symbiotic phaeosomes can be ingested and digested. Marine oceanic plankton in tropical and temperate waters, many species seem to be restricted to deeper waters.

Information contributed by: M. Elbrächter. The most recent alteration to this page was made on 2018-04-11 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=44649

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 11 April 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 23 May 2024

 
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