162,411 species and infraspecific names are in the database, 22,760 images, 64,001 bibliographic items, 474,997 distributional records.

Pyrocystis Wyville-Thompson, 1876

Empire Eukaryota
Kingdom Chromista
Subkingdom Harosa (supergroup SAR)
Infrakingdom Halvaria
Phylum Miozoa
Subphylum Myzozoa
Infraphylum Dinozoa
Superclass Dinoflagellata
Class Dinophyceae
Order Gonyaulacales
Family Pyrocystaceae
Subfamily Pyrocystoideae

Lectotype species: Pyrocystis pseudonoctiluca Wyville-Thompson

Original publication:Murray, J. (1876). Preliminary reports to Professor Thompson, F.R.S. and Director of the civilian scientific staff on work done on board the "Challenger". Proceedings of the Royal Society of London 24: 471-544, pls 21-23, 1 map.
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Type designated in Haeckel E. (1890). Plankton Studien. Jenaische Zeitschrift für Naturwissenschaft 25: 232-336.

Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Tillmann, U., Bantle, A., Krock, B., Elbrächter, M & Gottschling, M. (2021). Recommendations for epitypification of dinophytes exemplified by Lingulodinium polyedra and molecular phylogenetics of the Gonyaulacales based on curated rRNA sequence data. Harmful Algae 103: [1-16], 8 figs, 3 tables.

Nomenclatural notes
"The provisional generic name of Pyrocystis is proposed for the organisms figured in this Plate." (Thompson 1876: 533, pl. 21). The name "Pyrocistis" is used in pl. 21, which has two names "Pyrocistis pseudonoctiluca" and "Pyrocistis fusiformis". - (16 Apr 2013) - M.D. Guiry

Pyrocystis Murray ex Haeckel 1890 (Sournia, 1984: 351, 352). - (13 Jul 2018) - Wendy Guiry

Description: Coccoid phototrophic and bioluminescent dinophyte of small to large size (30-1000 µm). Shape globular (type species), bladder-like, lanceolate, or lunate. Vegetative reproduction by obligate alternation of coccoid stage and a short-lived (< 1 hour) reproductive body: either autospores (type species) or flagellated dinospores which may be uni- or biflagellated, unarmored or thecate. If thecate, plate pattern is like that of Gonyaulax Diesing. The formation of the reproductive stages are very distinctive, and this can be used to calculate mean doubling times of the species in natural waters (at least 2-10 days, species specific). Cytoplasm movement follows a circadian rhythm, as does bioluminescence. Nucleus always horseshoe shaped. All species with numerous chloroplasts. Marine oceanic plankton restricted to warm waters. The lunate species currently confused with the secondary cysts of the parasite Dissodinium Klebs in Pascher; therefore numerous records also from neritic temperate to cold water zones are incorrect. Several species currently used for investigations of circadian rhythms and bioluminescence. The specific weight of the coccal cells is regulated by exchange of SO4, Ca and Mg by NaCl.

Information contributed by: M. Elbrächter. The most recent alteration to this page was made on 5 Mar 2021 by M.D. Guiry.

Numbers of names and species: There are 20 species names in the database at present, as well as 9 infraspecific names. Of the species names, 14 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

Bérard-Therriault, L., Poulin, M. & Bossé, L. (1999). Guide d'identification du phytoplancton marin de l'estuaire et du Golfe du Saint-Laurent incluant également certains protozoaires. Publication Spéciale Canadienne des Sciences Halieutiques et Aquatiques 128: 1-387.

Dodge, J.D. (1982). Marine dinoflagellates of the British Isles. pp. 1-303, 35 figs, pls I-VIII. London: Her Majesty's Stationery Office.

Steidinger, K.A. & Tangen, K. (1996). Dinoflagellates. In: Identifying Marine Phytoplankton. (Tomas, C.R. Eds), pp. 387-584. San Diego: Academic Press.

Sournia, A. (1984). Classification et nomemclature de divers dinoflagellés marins (Dinophyceae). Phycologia 23(3): 345-355.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

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.

Created: 11 September 2004 by M.D. Guiry

Verified by: 05 March 2021 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=44589

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 29 July 2021.

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