Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia

Backgrounds and aims: Hantzschia Grunow is a genus characterized by having valves asymmetric to the apical axis, markedly dorsiventral, with an eccentric raphe on the ventral side supported by fibulae and ‘hantzschioid’ symmetry of the frustules. In 1942 J. Frenguelli published the flora of diatoms...

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Autores principales: Kociolek, Patrick, Vouilloud, Amelia A.
Formato: Artículo revista
Lenguaje:Inglés
Publicado: Sociedad Argentina de Botánica 2020
Materias:
Bacillariales
diatoms
Hantzschia
Nitzschia
SEM
systematics
valve morphology
diatomeas
MEB
sistemática,
morfología valvar
Acceso en línea:https://revistas.unc.edu.ar/index.php/BSAB/article/view/29200
Aporte de:
Boletín de la Sociedad Argentina de Botánica de Universidad Nacional de Córdoba
id I10-R325-article-29200
record_format ojs
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-325
container_title_str Boletín de la Sociedad Argentina de Botánica
language Inglés
format Artículo revista
topic Bacillariales
diatoms
Hantzschia
Nitzschia
SEM
systematics
valve morphology
Bacillariales
diatomeas
Hantzschia
Nitzschia
MEB
sistemática,
morfología valvar
spellingShingle Bacillariales
diatoms
Hantzschia
Nitzschia
SEM
systematics
valve morphology
Bacillariales
diatomeas
Hantzschia
Nitzschia
MEB
sistemática,
morfología valvar
Kociolek, Patrick
Vouilloud, Amelia A.
Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
topic_facet Bacillariales
diatoms
Hantzschia
Nitzschia
SEM
systematics
valve morphology
Bacillariales
diatomeas
Hantzschia
Nitzschia
MEB
sistemática,
morfología valvar
author Kociolek, Patrick
Vouilloud, Amelia A.
author_facet Kociolek, Patrick
Vouilloud, Amelia A.
author_sort Kociolek, Patrick
title Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
title_short Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
title_full Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
title_fullStr Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
title_full_unstemmed Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia
title_sort hantzschia subandina frenguelli (bacillariophyceae): morphology, status and typification, as well as the description of a new species of nitzschia
description Backgrounds and aims: Hantzschia Grunow is a genus characterized by having valves asymmetric to the apical axis, markedly dorsiventral, with an eccentric raphe on the ventral side supported by fibulae and ‘hantzschioid’ symmetry of the frustules. In 1942 J. Frenguelli published the flora of diatoms of Neuquén province (Argentina), work in which he erected Hantzschia subandina as a new species for science. This work investigates the identity and taxonomic status of this taxon.  M&M: Original material of Hantzschia subandina of the Frenguelli Collection was analysed with light and scanning electron microscopy. Results & Conclusions: Observations on the material suggested two different species were included in the concept of this species assigned originally to the genus Hantzschia. Furthermore, neither of the two species present are assignable to the genus Hantzschia. Nitzschia subandina (Frenguelli) comb. nov. has a large central nodule and a slight asymmetry about the apical axis; it also produces frustules with nitzschioid and hantzschioid symmetry. We designate a lectotype for this taxon. In addition, another diatom in the same material with slight asymmetry about the apical axis has distinctive ornamentation on the mantle of the valve and produces nitzschioid and hantzschioid frustules. For this taxon we tentatively assign it to the non-monophyletic genus Nitzschia, describing it as N. araucana sp. nov. We discuss the possible phylogenetic position of this new taxon, and suggest that the genus Nitzschia is “the next Navicula” ready to be further subdivided into distinct genera.
publisher Sociedad Argentina de Botánica
publishDate 2020
url https://revistas.unc.edu.ar/index.php/BSAB/article/view/29200
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spelling I10-R325-article-292002021-02-18T22:39:31Z Hantzschia subandina Frenguelli (Bacillariophyceae): Morphology, status and typification, as well as the description of a new species of Nitzschia Hantzschia subandina Frenguelli (Bacillariophyceae): Morfología, status y tipificación, asi como la descripción de una nueva especie de Nitzschia. Kociolek, Patrick Vouilloud, Amelia A. Bacillariales diatoms Hantzschia Nitzschia SEM systematics valve morphology Bacillariales diatomeas Hantzschia Nitzschia MEB sistemática, morfología valvar Backgrounds and aims: Hantzschia Grunow is a genus characterized by having valves asymmetric to the apical axis, markedly dorsiventral, with an eccentric raphe on the ventral side supported by fibulae and ‘hantzschioid’ symmetry of the frustules. In 1942 J. Frenguelli published the flora of diatoms of Neuquén province (Argentina), work in which he erected Hantzschia subandina as a new species for science. This work investigates the identity and taxonomic status of this taxon.  M&M: Original material of Hantzschia subandina of the Frenguelli Collection was analysed with light and scanning electron microscopy. Results & Conclusions: Observations on the material suggested two different species were included in the concept of this species assigned originally to the genus Hantzschia. Furthermore, neither of the two species present are assignable to the genus Hantzschia. Nitzschia subandina (Frenguelli) comb. nov. has a large central nodule and a slight asymmetry about the apical axis; it also produces frustules with nitzschioid and hantzschioid symmetry. We designate a lectotype for this taxon. In addition, another diatom in the same material with slight asymmetry about the apical axis has distinctive ornamentation on the mantle of the valve and produces nitzschioid and hantzschioid frustules. For this taxon we tentatively assign it to the non-monophyletic genus Nitzschia, describing it as N. araucana sp. nov. We discuss the possible phylogenetic position of this new taxon, and suggest that the genus Nitzschia is “the next Navicula” ready to be further subdivided into distinct genera. Introducción y objetivos: Hantzschia Grunow es un género de diatomeas caracterizado por la asimetría dorsiventral de sus valvas, rafe soportado por fíbulas sobre el margen ventral, y simetría hatzschioide de los frústulos. En 1942 J. Frenguelli publicó la flora de diatomeas de la provincia de Neuquén (Argentina), obra en la que erigió a Hantzschia subandina como una nueva especie para la ciencia. El objetivo de este trabajo es analizar la identidad de este taxón y su status taxonómico.  M&M: El material original de Hantzschia subandina, presente en la Colección Frenguelli depositada en el Herbario de la División Ficología del Museo de La Plata, fue analizado con microscopías óptica y electrónica de barrido. Resultados & Conclusiones: la observación del material original de Hantzschia subandina sugiere que dos entidades distintas fueron incluidas en el concepto de esta especie. Ambas producen frústulos tanto con simetría nitzschiode como hantzschioide, por lo que ninguna de ellas pertenece al género Hantzschia. La primera presenta un nódulo central conspicuo y leve asimetría según el eje apical; consideramos que estos ejemplares corresponden a Nitzschia subandina (Frenguelli) comb. nov., y realizamos la enmienda y lectotipificación del taxón. La segunda entidad presente en el mismo material, posee una leve asimetría según el eje apical, y una distintiva ornamentación en el manto valvar; hemos asignado este taxón al género Nitzschia, describiendo N. araucana sp. nov. Discutimos la posible posición filogenética de este nuevo taxón dentro de Nitzschia, género polifilético que requiere de una profunda revisión y subdivisión en géneros, tal como ocurrió con el género Navicula. Sociedad Argentina de Botánica 2020-12-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion text/html application/pdf https://revistas.unc.edu.ar/index.php/BSAB/article/view/29200 10.31055/1851.2372.v55.n4.29200 Boletín de la Sociedad Argentina de Botánica (Journal of the Argentine Botanical Society; Vol. 55 No. 4 (2020): December; 521-534 Boletín de la Sociedad Argentina de Botánica; Vol. 55 Núm. 4 (2020): Diciembre; 521-534 Boletín de la Sociedad Argentina de Botánica; v. 55 n. 4 (2020): Diciembre; 521-534 1851-2372 0373-580X 10.31055/1851.2372.v55.n4 eng https://revistas.unc.edu.ar/index.php/BSAB/article/view/29200/31817 https://revistas.unc.edu.ar/index.php/BSAB/article/view/29200/31582 Derechos de autor 2020 Patrick Kociolek, Amelia A. Vouilloud https://creativecommons.org/licenses/by-nc-nd/4.0

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