Plagioselmis Butcher ex G.Novarino, I.A.N.Lucas & S.Morrall, 1994

Holotype species: Plagioselmis prolonga Butcher ex G.Novarino, I.A.N.Lucas, & S.Morrall

Currently accepted name for the type species: Teleaulax amphioxeia (W.Conrad) D.R.A.Hill

Original publication and holotype designation: Novarino, G., Lucas, I.A.N. & Morrall, S. (1994). Observations on the genus Plagioselmis (Cryptophyceae). Cryptogamie, Algologie 15: 87-107.

Description: Small, free-swimming, generally acuminate, biflagellate monads with a longitudinal furrow extending posteriorly from the vestibulum; there is no gullet; the furrow is lined with two to four longitudinal rows of ejectisomes; a single chloroplast, pyrenoid and nucleomorph, the chloroplast with the phycobiliprotein Cr-Phycoerythrin 545, varying in color from pink to red-brown and orange; the periplast with inner component plates. Sexual reproduction is unknown; reproduction being by simple cell division. Cysts are unknown and palmelloid colonies apparently not formed. The ultastructure has been examined. The periplast consists of hexagonal inner component plates and an unusual superficial component with rosulate scales and plate borders but no plates. The nucleomorph is not associated with the pyrenoid and thylakoids do not traverse the pyrenoidal matrix. The thylakoids in the chloroplast are arranged in groups of three rather than the usual loosely associated pairs. Genus cosmopolitan in coastal marine waters; Plagioselmis prolonga is a common and often very abundant species, but has probably often been overlooked due to its small size and delicate nature.

Information kindly contributed by D.R.A. Hill but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Teleaulax.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Altenburger, A., Blossom, H.E., Garcia-Cuetos, L., Jakobsen, H.H., Carstensen, J., Lundholm, N., Hansen, P.J., Moestrup, Ø & Haraguchi, L. (2020). Dimorphism in cryptophytes—the case of Teleaulax amphioxeia/ Plagioselmis prolonga and its ecological implications. Science Advances 6(eabb1611): 1-9, 5 figs. 1 table.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 18 October 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 25 June 2024

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