Sellaphora lanceolata D.G.Mann & S.Droop 2004
Publication Details
Sellaphora lanceolata D.G.Mann & S.Droop 2004: 479, figs. 4 p-r, 22, 48-52
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, Edinburgh; (Mann & al. 2004: 479) 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: 479, 460)
Origin of Species Name
Adjective (Latin), lance-shaped.
General Environment
This is a freshwater species.
Description
The valves are narrowly elliptical with rostrate ends, 24-30 µm long and 7.1-8.1 µm wide. The ratio of pole width to maximum width is c. 1:1.7. The axial area is narrow and straight. The central area is irregular in outline, because of the presence around it of approximately alternate long and short striae, but overall it is elliptical or transversely oblong. The central area is invaded by 'ghost striae', which are inward extensions of the normal striae that lack poroids: they are thinner strips of silica, appearing as grooves internally and sometimes also externally, especially if the valves have begun to dissolve. They probably represent areas that have been infilled during development of the valve, but this cannot be confirmed without studies of valve ontogeny. The areolae are not resolved in LM, but are ± circular or elliptical and equally spaced poroid, with a density of c. 55 in 10µm transapically. The striae are radiate over most of the valve but convergent at poles, with an abrupt change between the two series, usually marked by geniculate striae and short striae that originate by the raphe but are truncated ± midway to the margin; the striation density is 17.7-21.8 in 10 µm. The striae and transapical ribs are of approximately equal height externally, so that the valve face appears plain. The polar bars appear sharply angled towards the central area in LM. The raphe appears simple, straight and threadlike in LM. The external central raphe endings are expanded and scarcely deflected towards the primary side. The terminal fissures curve smoothly towards the secondary side. The helictoglossa is narrow and elongate.
Created: 20 November 2004 by Sandy Lawson.
Last updated: 20 March 2019
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=65920
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 20 April 2024
