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Pillonel, Amandine

Nom
Pillonel, Amandine
Affiliation principale
Email
amandine.pillonel@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/372

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  • Publication
    Accès libre
    Eight species in the Nebela collaris complex: Nebela gimlii (Arcellinida,Hyalospheniidae), a new species described from a Swiss raised bog
    Singer, David 
    ;
    Kosakyan, Anush 
    ;
    Pillonel, Amandine 
    ;
    Mitchell, Edward 
    ;
    Lara, Enrique 
    We describe here a new species of sphagnicolous testate amoeba found abundantly in the forested part of the Le Cachot peatland (Jura Mountains, Neuchâtel, Switzerland) based on microscopical observations (LM, SEM). The new species, called Nebela gimlii was placed in a phylogenetic tree based on mitochondrial cytochrome oxidase sequences (COI), and branched robustly within the N. collaris complex next to the morphologically similar N. guttata and N. tincta. It is however genetically clearly distinct from these two species, and differs morphologically from them by its smaller size and stouter shape of the shell. This new species completes the phylogeny of the Nebela collaris species complex, with now eight species described, mostly from peatlands and acidic forest litter, and further demonstrates the existence of an unknown diversity within testate amoebae. Improving the taxonomy of testate amoebae in peatlands and clarifying the ecology of newly discovered species should make these organisms even more valuable as bioindicator and for palaeoecological reconstruction.
  • Publication
    Accès libre
    Incipient loss of flagella in the genus Geolegnia: the emergence of a new clade within Leptolegnia?
    Steciow, Mónica M
    ;
    Lara, Enrique 
    ;
    Pillonel, Amandine 
    ;
    Pelizza, Sebastián A
    ;
    Lestani, Eduardo A
    ;
    Rossi, Gustavo C
    ;
    Belbahri, Lassaâd 
    The genus Geolegnia represents a poorly documented group of saprolegnialean oomycetes isolated from soils as free-living organisms. Although it is morphologically similar to the facultative parasitic genus Leptolegnia, Geolegnia presents the uncommon property of having lost a flagellate stage in its lifecycle. Based on ITS and large subunit (LSU) rRNA sequence data, we show Geolegnia to be basal to Leptolegnia, and also introduce Geolegnia helicoides sp. nov. Using sequence data of Leptolegnia available in GenBank, supplemented by data derived from culture collections, we show that Geolegnia is nested within Leptolegnia, a genus characterised by its “conventional” biflagellate life cycle. The emergence of Geolegnia is therefore seen as a recent event, and we suggest here an evolutionary context where this loss might have been advantageous. Based on this study, Leptolegnia remains paraphyletic, awaiting the redefinition of genera in this complex.