Oxyphysis Kofoid, 1926
Holotype species: Oxyphysis oxytoxoides Kofoid
Currently accepted name for the type species: Phalacroma oxytoxoides (Kofoid) F.Gomez, P.Lopez-Garcia & D.Moreira
Original publication and holotype designation: Kofoid, C.A. (1926). On Oxyphysis oxytoxoides gen. nov. sp. nov. A dinophysoid dinoflagellate convergent toward the peridinioid type. University of California Publications in Zoology 28(10): 203-216, pl. 18.
Description: Medium-sized (ca. 60 µm) elongated, laterally compressed flagellate of asymmetric fusiform shape, divided by a circular cingulum into a smaller epicone and larger hypocone. Epitheca an asymmetrical cone with unequally concave sides, asymmetrical apex and a flaring base. The apex contracts abruptly to a blunt end with a small blade. Hypocone about 0.55 of total body length and contracts uniformly posteriorly on both sides to an obtuse, oblique truncate antapex. Cingulum is wide and deeply impressed, the cingular lists are small. Sulcus is short, the right sulcal list is shorter than the left one, both are hyaline and not conspicuous. The plate formula is like that of Dinophysis Stein. Nucleus situated in the hypocone, no chloroplast. Nutrition is by phagotrophy, a feeding tube is extended by the cell and the prey (ciliates, tinnids) are sucked out. Sexual reproduction and cyst formation not known. Marine plankton, reported rarely from the Pacific, Atlantic, and Mediterranean; from polar water off Alaska to subtropical regions.
Information kindly contributed by M. Elbrächter but may now be outdated.
Taxonomic status: This name is currently regarded as a synonym of Phalacroma.
Most recent taxonomic treatment adopted: Gómez, F., López-García, P. & Moreira, D. (2011). Molecular phylogeny of dinophysoid dinoflagellates: the systematic position of Oxyphysis oxytoxoides and the Dinophysis hastata group (Dinophysales, Dinophyceae). Journal of Phycology 47(2): 393-406.
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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=44665
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 24 May 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 May 2023