Sellaphora obesa D.G.Mann & M.M.Bayer 2004
Publication Details
Sellaphora obesa D.G.Mann & M.M.Bayer 2004: 473, figs. 4 d-f, 18, 28-32
Published in: Mann, D.G., McDonald, S.M., Bayer, M.M., Droop, S.J.M., Chepurnov, V.A., Loke, R.E., Ciobanu, A. & du Buf, J.M.H. (2004). The Sellaphora pupula species complex (Bacillariophyceae): morphometric analysis, ultrastructure and mating data provide evidence for five new species. Phycologia 43(4): 459-482, 52 figs, 4 tables.
Request PDFPublication date: 30 July, 2004
Type Species
The type species (lectotype) of the genus Sellaphora is Sellaphora pupula (Kützing) Mereschkovsky.
Status of Name
This name is of an entity that is currently accepted taxonomically.
Type Information
Holotype locality: Blackford Pond, Scotland; (Mann & al. 2004: 473, 474) Holotype: December '83; 70 m altitude; mud slurry from small, artificial, eutrophic lake fed by groundwater seepage and underwater springs; E; E16/4 (mud (tissue)) (Mann & al. 2004: 473, 474, 460)
General Environment
This is a freshwater species.
Description
The valves are elliptical or narrowly elliptical with rostrate ends, 20-53 µm long and 8.1-10.0 µm wide. The ratio of pole width to maximum width is c. 1:1.8. The axial area is narrow and straight. The central area is a rectangular or slightly bow-tie-shaped subfascia; its outline is somewhat irregular, as a result of the presence of approximately alternate long and short striae. The areolae are not resolved in LM but are ± circular or elliptical and equally spaced poroids, with a density of c. 53 in 10 µm. The frets separating the poroids are lower than the transapical ribs externally, so that the valve face is ridged, with grooves along the striae. The polar silica bars appear perpendicular to the apical axis in LM or a little reflexed. The raphe-sternum is elevated externally, with well-marked grooves separating it from the remainder of the valve face. The raphe appears simple, straight and threadlike in LM. The external central raphe endings are slightly expanded and deflected a little towards the primary side; the internal endings are also deflected towards the primary side. The terminal fissures are hooked, curving smoothly towards the secondary side. The helictoglossa is narrow and elongate.
Created: 19 November 2004 by Sandy Lawson.
Last updated: 20 March 2019
Verification of Data
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=65916
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 20 March 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 19 April 2024
