Sellaphora capitata D.G.Mann & S.M.McDonald 2004

Publication Details
Sellaphora capitata D.G.Mann & S.M.McDonald 2004: 477, figs 4 j-l, 20, 38-42

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.

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Publication 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, Scotland; (Mann & al. 2004: 477) Holotype: material of clone BLA18 (=B1 89), as preserved on slide E3608 (E); isolated 5 October 2004, from epipelon of soft mud (epitype) 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: 477, 460) Notes: Epitype: Evans & Mann (2009: 71, fig. 3).

Origin of Species Name
Adjective (Latin), with a knob-like head or tip (Stearn 1983).

General Environment
This is a freshwater species.

Description
The valves are narrowly elliptical with subcapitate poles (these are more strongly capitate in larger valves), 19-44 µm long and 7.2-8.2 µm wide. the axial area is narrow and straight, and the raphe appears as a straight line in LM or very slightly undulate. The central area is a bow-tie-shaped subfascia; its outline is somewhat irregular, as a result of the presence of approximately alternate long and short striae. The areolae cannot be resolved in LM, but are ± circular or elliptical and equally spaced poroids, with a density of 62 in 10 µm transapically. Figurtes 41, 42 show a valve that has not been significantly eroded or dissolved during specimen preparation and storage. As a result, the small domed hymenes are still visible at the inner apertures of the poroids. The striae are mostly radiate, becoming parallel near the poles, with a density of 16.2-22.3 in 10µm; many striae terminate in one or a few larger poroids at the axial area. The polar bars are relatively more distant from the apex than in S. blackfordensis and are perpendicular to the raphe. The raphe-sternum is flush with the valve face near the poles, but slightly elevated near the centre. The raphe appears simple in LM and is slightly undulate and threadlike. The external central raphe endings are expanded and deflected towards the primary side; the internal endings are also deflected towards the primary side. Above the helictoglossa, which is narrow and elongate, the terminal fissure is abruptly bent towards the secondary side.

Created: 20 November 2004 by Sandy Lawson.

Last updated: 04 February 2021

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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=65918

Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 04 February 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 November 2024

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