Thecadinium Kofoid & Skogsberg, 1928

Lectotype species: Thecadinium petasatum Kofoid & Skogsberg

Currently accepted name for the type species: Thecadinium kofoidii (Herdman) J.Schiller

Original publication: Kofoid, C.A. & Skogsberg, T. (1928). The Dinoflagellata: the Dinophysoidae [No.] XXXV. Reports on the scientific results of the expedition to the Eastern Tropical Pacific, in charge of Alexander Agassiz, by the U.S. Fish Commission Steamer "Albatross" from October 1904 to March 1905, Lieut. Commander L.M. Garrett, U.S.N., Commanding. . Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass. 51: 1-766.

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Type designated in: Balech, E. (1956). Étude des Dinoflagellés du sable de Roscoff. Revue Algologique, Nouvelle Serie 2: 29-52.

Description: Small to medium-sized (20-45µm) species, laterally compressed with small epicone and a large hypocone, mainly enclosed by 2 large hypothecal plates. Nucleus elongated in the dorsal part of the hypocone; numerous trichocysts and mucocysts present, with numerous elongated chloroplasts, radiating from a pyrenoid. Plate formula of the type species: Po, 3', 1a, 4" 5c, ?s, 3"' 1"", other species described with 5'". Sexual reproduction and cyst formation not known. Emend. Selina & Hoppenrath (2019: 40). Hoppenrath & al. (2023: 250): Thecate genus with laterally flattened cells with relatively small epitheca and larger, posterior slightly pointed hypotheca. Apical pore complex present, with hook-shaped apical pore. Right anteriorsulcal plate contacting Po plate. Incomplete precingular plate series. Complete cingulum without displacement. Two, large lateral postcingular plates. Brown chloroplasts present, sensu lato: Thecate genus with laterally flattened cells with relatively small (reduced) epitheca and larger hypotheca. Hypotheca consists mainly of two large lateral plates.

Information contributed by: Various.. The most recent alteration to this page was made on 2024-06-14 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as neuter.

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: Marine, sand-dwelling, rarely washed into coastal plankton.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 14 June 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 July 2024

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