Haidadinium Buckland-Nicks, Reimchen & Garbary, 1997

Holotype species: Haidadinium ichthyophilum Buckland-Nicks, Reimchen & Garbary

Original publication and holotype designation: Buckland-Nicks, J., Reimchen, T.E. & Garbary, D.J. (1997). Haidadinium ichthyophilum gen. et. sp. nov (Phytodiniales, Dinophyceae), a freshwater ectoparasite on stickleback (Gasterostens aculeatus) from the Queen Charlotte Islands, Canada. Canadian Journal of Botany 75: 1936-1940.

Description: Microscopic unicellular organisms with the primary vegetative cyst associated with the external epithelium and gills of the three-spined stickleback, Cell structure various, ranging from fenestrated matrix in vegetative cysts, to absent in some amoeboid stages; gymnodinioid swarmer stage unarmoured. Dinokaryon in swarmer trophont and vegetative cyst but eukaryon in amoeboid stages and resting cysts, Cells mostly uninucleate but cyst stage becoming highly multinucleate during sporogenesis. Chloroplasts multiple per cell and discoid; with thyIakoids in groups of three and often with projecting pyrenoid. Chloroplasts present in cyst and swarmer stages but absent in amoeboid stages. Intracellular symbiotic bacteria occur in all stages of the life cycle both in the cytoplasm and in the nucleus.Asexual reproduction associated with diverse stages and by means of binary fission, the release of zoospores and the production of various lobose. rhizopodial and spheroidal amoeboid stages as well as aplanospore production. These life history stages mostly known from culture. Sexual reproduction unknown. Haidadinium in acidic freshwater with low levels of calcium; known only from two watersheds in the lowlands of the Queen Charlotte Islands, British Columbia, Canada. Cells typically associated with the three-spined stickleback, Gasterosteus aculeatus, in which they induce epithelial hyperplasia. Cysts may also be associated with filamentous algae on which they can form trophonts.

Information contributed by: D.J. Garbary. The most recent alteration to this page was made on 2018-10-26 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: Ectoparasitic coccoid cells on stickleback (Gasterosteus aculeatus).

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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=46547

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 October 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 April 2024