Eunotogramma J.F.Weisse, 1855
Lectotype species: Eunotogramma laeve Grunow
Publication details: J.F.Weisse, 1855: 243
Original publication: Weisse, J.F. (1855 '1854'). Mikroskopische Analyse eines organischen Polirschiefers aus dem Gouvernment Simbirsk. Mélanges Biologiques tirés du Bulletin Physico-Mathematique de l'Académie Impériale des Sciences de St. Petersbourg 2: 237-250, pls I-III.
Request PDFType designated in: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms. Biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.
Fossil: This is a genus of fossil species, or a genus with a fossil type species, or a genus the type species of which was originally described as a fossil.
Description: Cells asymmetrical about the apical plane; dorsal margin convex and ventral margin more-or-less straight or slightly convex; rectangular in girdle view. Solitary or forming short chains. Plastids not observed. A widespread and common marine genus, but rarely recorded owing to its small size and preponderant occurrence attached to sand grains - also fossil. Valves sometimes slightly inflated in the centre of the ventral margin, to elongate, slightly arcuate, in some with an abrupt downturned mantle and slight ridge at the valve face/mantle junction. Areolae radiating from a central annulus or in transverse rows interrupted by plain cross-bars; valve surface sometimes spinulose or rugose. Vela not studied. A small rimoportula opening occurs near the central ventral margin but some valves appear to have a row of rimoportulae along the dorsal margin. Internally with well-developed transverse costae curving from mantle edge to mantle edge. Copulae appear to be incomplete bands but more studies are needed.
The most recent alteration to this page was made on 2024-10-01 by G.M. Guiry.Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as neuter.
Comments: Only 13 spp. are recognised by VanLandingham (1969) and they certainly need re-investigation. It is usually placed close to Anaulus in classificatory systems. Our specimens are not easy to study and there are many points requiring clarification. The number and position of the rimoportulae appears rather variable as does the ornamentation of the valve face.
Nomenclatural notes
Compounds ending in "-gramma" are treated as neuter. - (16 August 2017) - M.D. Guiry
CAS: "Type not designated ? or designated by F.E. Round in Round, Crawford & Mann (ref. 003245), p. 288 (1990) ? Comments: An illustration is provided (fig. 37 a-h). No binomials are formed with this genus name, however it is inferred from the text that the following species names: E. triloculatum, E. quinqueloculatum, E. septemloculatum and E. novemloculatum, are intended for specimens illustrated fig. 37 a/e, b/f, c/g and d/h respectively (note: these species names are probably not validly published here). Five species (E. producta, E. laevis, E. variabilis, E. frauenfeldii, E? debilis) are published and illustrated pl. 126 of Grunow in Van Heurck 1883 (ref. 001037). Boyer 1927 (ref. 000155), p. 143 designates Eunotogramma triloculatum Weisse as generitype, a species that probably was (and probably still is) not validly published. Round in Round, Crawford, Mann (1990), p. 288 (ref. 003245) designated Eunotogramma laevis Grunow as the generitype, an untenable choice unless it can be demonstrated that this species is conspecific with the material considered in the original publication. It seems that the type of this species might be "not designated" as indicated in Farr et al. 1979. " - (20 October 2011) - M.D. Guiry
1855: 278; type not designated [Paleocene] (INA). - (28 June 2017) - G.M. Guiry
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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)
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These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above.
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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:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 01 October 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 17 June 2025
