Piscinoodinium J.Lom, 1981

Holotype species: Piscinoodinium pillulare (Schäperclaus) Lom

Original publication and holotype designation: Lom, J. (1981). Fish invading dinoflagellates: a synopsis of existing and newly proposed genera. Folia Parasitologica (Ceske Budejovice) 28: 3-11.

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Description: Ectoparasitic on gills and skin of freshwater fish, including aquarium fish (velvet disease). Cells (trophont) spherical to ovoid-pyriform, attached to fish with attachment disc containing numerous, up to 40 µm long, radiating rhizoid-like organelles, which penetrate into and are firmly embedded in the epithelial cells of the host. Often several trophonts together. Nucleus in the upper third of the cell. Numerous chloroplasts have been reported. Starch grains may be present in large numbers. When the trophont has reached maturity it withdraws the rhizoids and detaches from the host. It then sinks to the lake bottom, rounds off and forms a walled Palmella stage (tomont). This divides by transverse divisions into progressively smaller cells, as many as 128, each of which divides into two gymnodinioid motile cells (zoospores). The zoospores represent the infectious stage, attacking and attaching to fish. The trophont possesses remains of the flagellar apparatus and, although not mentioned by the authors, an eyespot of suessiacean kind (type E) is visible in Lom & Schubert (1983, fig. 17, top left), indicating the suessiacean affinity of Piscinoodinium.

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: 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=51375

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 24 December 2024