Eupodiscus J.W.Bailey, 1851, nom. et typ. cons.
Holotype species: Eupodiscus radiatus Bailey
Original publication and holotype designation: Bailey, J.W. (1851). Microscopical observations made in South Carolina, Georgia and Florida. Smithsonian Contributions to Knowledge 2(8): 1-48, 3 plates.
Request PDFDescription: Cells solitary, discoid. Plastids not observed. Occurring in marine habitats; probably epiphytic or even benthic but not often recorded except in loose-lying populations on coastal sediments; such material may be fossil since there seem to be no records of living cells. Valves circular, with a radiating system of raised hexagonal thickenings. Within the hexagons rows of pores occur and overall these form a radiating system. Each hexigon corresponds to an areola; these are loculate, opening to the outside by several tiny pores and to the inside by a fairly small foramen. Within the locules the foramen has a slightly raised rim and is open, whilst on the internal surface of the valve there is a dome that suggests there may be some form of closing membrane; we have not been able to study the detail. The margin of the valve face is 'scalloped' forming a narrow ridge or wing. Interrupting the ridge are four equally spaced low ocelli. The valve mantle has continuing rows of fine pores but is also variously ornamented with spines, dendritic outgrowths, etc., and often has a circumferential ridge above the outwardly turned mantle edge. The internal openings of the ocelli are sunken. The ocellus pores are round and arranged in more-or-less concentric rows. According to Sullivan (1986), there are no portulae present in this genus (there are none in our material) but in material photographed by Sims there are minute rimoportulae on the mantle between the ocelli (P.A. Sims, personal communication). In many species the internal and external development of the rimoportula is very slight. Copulae not studied.
The most recent alteration to this page was made on 2015-10-19 by M.D. Guiry.Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. 13th Ed. Photoautotrophic eukaryotic algae Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Heterokontophyta/Ochrophyta, Chlorarachniophyta/Cercozoa, Euglenophyta/Euglenozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 64-103. Stuttgart: Borntraeger Science Publishers.
Comments: There has been confusion in the taxonomy and E. Radiatus Bail. has been conserved over E. (Tripodiscus) germanicus Enr. Little seems to be known about the ecology and distribution of this characteristic genus.
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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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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 October 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024
