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|Title: ||Morphological reconsideration of the araphid genus Pseudostaurosira (Bacillariophyceae), a revision of Gedaniella, Popovskayella and Serratifera, and a description of a new Nanofrustulum species|
|Authors: ||Morales, Eduardo A.|
Wetzel, Carlos E.
Novais, Maria Helena
Morais, Maria Manuela
|Issue Date: ||Jul-2019|
|Publisher: ||Meise Botanic Garden and Royal Botanical Society of Belgium|
|Citation: ||Morales E.A., Wetzel C.E., Novais M.H., Buczkó K., Morais M.M. & Ector L. (2019). Morphological reconsideration of the araphid genus Pseudostaurosira (Bacillariophyceae), a revision of Gedaniella, Popovskayella and Serratifera, and description of a new Nanofrustulum species. Plant Ecology and Evolution 152:262-284. https://doi.org/10.5091/plecevo.2019.1604|
|Abstract: ||Background and aims – As a result of the description of many new species, reanalyses of type material, and
information becoming available on valve morphogenesis in small araphid diatoms lacking a rimoportulae,
the existing classification scheme at the genus level needs revision. Because morphological information
has increased manyfold since the system provided by Williams & Round (1987), it may now be possible
to find distinguishing characters in order to produce a more stable and useful framework, encompassing
a morphogenetic perspective, which could then guide the placement of newly discovered taxa. This new
framework could also be used to help assess the molecular information generated for the group, based on
which many new genera are being erected, but perhaps without proper pondering of morphological data.
Methods – A thorough review was made of available published information on the ultrastructure of smallcelled araphid diatoms lacking rimoportulae. In addition, image databases were searched, and new light
and scanning electron microscopical observations made of some hitherto undescribed species.
Key results and conclusions – We provide a table of putative distinguishing features for nine genera
(Nanofrustulum, Opephora, Pseudostaurosira, Pseudostaurosiropsis, Punctastriata, Sarcophagodes,
Stauroforma, Staurosira and Staurosirella), together with a discussion on their value for discriminating
these small diatoms using a morphogenetic perspective. Based on our findings, we amend the genus
Pseudostaurosira, establishing wide and short vimines as its most characteristic feature. We use our
system in describing a new species from Bolivia, which we place in Nanofrustulum based on its quasifract
copulae, the distinguishing trait of the genus. The new species is distinguished from its congeners by
its heteropolar valves, apical pore field features, and the multiseriate areolae. We also examine the three
genera Popovskayella, Gedaniella, and Serratifera, the latter two recently erected based on molecular
information. Since none of these latter genera pass the morphogenetic evaluation we think is essential, we
place them in synonymy with other genera and provide the consequent nomenclatural changes. Finally, we
make several new combinations in Nanofrustulum, Pseudostaurosira, Sarcophagodes and Staurosirella.|
|Appears in Collections:||ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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