Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)

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The type materials of Pleurosigma formosum W. Smith and P. decorum W. Smith wereexamined. Both species were separated hitherto by size range, valve shape and stria density basedon light microscopy (LM) analysis. However, the type materials show some overlap in the size and striadensity ranges, with...

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Autores principales: Sterrenburg, Frithjof A. S, Sar, Eugenia A., Sunesen, Inés
Formato: Artículo revista
Lenguaje:Inglés
Publicado: Sociedad Argentina de Botánica 2014
Materias:
P. decorum
P. formosum
taxonomía
materiales tipo
ultraestructura.
Acceso en línea:https://revistas.unc.edu.ar/index.php/BSAB/article/view/7787
Aporte de:
Revistas de la UNC de Universidad Nacional de Córdoba
id I10-R10article-7787
record_format ojs
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-10
container_title_str Revistas de la UNC
language Inglés
format Artículo revista
topic P. decorum
P. formosum
taxonomía
materiales tipo
ultraestructura.
spellingShingle P. decorum
P. formosum
taxonomía
materiales tipo
ultraestructura.
Sterrenburg, Frithjof A. S
Sar, Eugenia A.
Sunesen, Inés
Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
topic_facet P. decorum
P. formosum
taxonomía
materiales tipo
ultraestructura.
author Sterrenburg, Frithjof A. S
Sar, Eugenia A.
Sunesen, Inés
author_facet Sterrenburg, Frithjof A. S
Sar, Eugenia A.
Sunesen, Inés
author_sort Sterrenburg, Frithjof A. S
title Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
title_short Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
title_full Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
title_fullStr Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
title_full_unstemmed Analysis of type material of Pleurosigma formosum and P. decorum (Pleurosigmataceae, Bacillariophyta)
title_sort analysis of type material of pleurosigma formosum and p. decorum (pleurosigmataceae, bacillariophyta)
description The type materials of Pleurosigma formosum W. Smith and P. decorum W. Smith wereexamined. Both species were separated hitherto by size range, valve shape and stria density basedon light microscopy (LM) analysis. However, the type materials show some overlap in the size and striadensity ranges, with subtle differences in the oblique stria intersection angle, which is somewhat smallerfor P. decorum. Scanning electron microscopy (SEM) analysis shows that both species share severalultrastructural features such as a thick saddle-shaped central raphe nodule, very long overlapping centralraphe fissures, short hook-shaped terminal raphe fissures, general morphology of the internal hymenoccludedpores crossed by a recessed bar and presence of some scattered pairs of more deeply recessedpores lacking a bar. However, the type specimens differ in the internal morphology of the hymen-occludedareolar pores, circular, crossed by a recessed bar and rimmed in P. formosum and subcircular to elliptical,crossed by a less recessed bar, not rimmed in P. decorum. The SEM findings thus support Hendey’s viewthat P. decorum and P. formosum are separate but closely allied species.
publisher Sociedad Argentina de Botánica
publishDate 2014
url https://revistas.unc.edu.ar/index.php/BSAB/article/view/7787
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