Triparma B.C.Booth & H.J.Marchant, 1987

Holotype species: Triparma columacea B.C.Booth

Original publication and holotype designation: Booth, B.C. & Marchant, H.J. (1987). Parmales, a new order of marine chrysophytes, with descriptions of three new genera and seven new species. Journal of Phycology 23: 245-260.

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Description: Cell small, 3-5 &m in diam. Cell wall of 8 plates: 3 small round plates (shield plates), one large round plate (ventral plate), one triradiate plate and 3 oblong girdle plates. Plates smooth, striate, reticulate, or papillate. Triradiate plates may be keeled, and girdle plates keeled, winged or spinous. One bi-lobed, cup-shaped chloroplast without a pyrenoid. Chloroplast with lamellae made up of 3 thylakoids and a peripheral girdle lamella. Chloroplast enclosed by a cisterna of endoplasmic reticulum. Mitochondrion large with indistinct cisternae. One small Golgi body. Nucleus central to the chloroplast and appressed to it. Outer nuclear envelope apparently confluent with chloroplast envelope. Reproduction has not been observed to date. Triparma occurs with Tetraparma primarily in waters of the open ocean, ice-influenced coastal waters and other northern coastal waters. One observation has been made in the Bay of Bothnia (inner Baltic Sea), and large populations occurred in Sanich Inlet, British Columbia, Canada. Major populations occur in the subarctic Pacific and Antarctic oceans. Single observations from the Indian Ocean and the California Current. The genera Tetraparma and Pentalamina are closely related to Triparma. The most abundant and widespread genus of the Parmales, which contains planktonic marine cells with cell walls composed of a small number of siliceous plates of various shapes all fitting together edge to edge.

Information contributed by: B. Booth. The most recent alteration to this page was made on 2022-11-21 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 feminine.

Most recent taxonomic treatment adopted: Kuwata, A., Yamada, K., Ichinomiya, M., Yoshikawa, S., Tragin, M., Vaulot, D. & Lopes dos Santos, A. (2018). Bolidophyceae, a sister picoplanktonic group of diatoms – a review. Frontiers in Marine Science 5(370): 1-17, 10 figs, 4 tables.

Comments: Description emended by Konno & Jordan (2007: 615).

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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. 21 November 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 28 May 2024

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