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Université de Neuchâtel

YANOMAMUA ARACA (GENTIANACEAE), A NEW GENUS AND SPECIES FROM SERRA DO ARAÇÁ, AN OUTLIER OF THE GUAYANA REGION IN AMAZONAS STATE, BRAZIL

Grant, Jason R ; Maas, Paul J. M ; Struwe, Lena

In: Harvard Papers in Botany, 2006, vol. 11, no. 1, p. 29-37

Yanomamua araca is described as a new genus and species from Serra do Araçá, an outlier of the Guayana Region in the state of Amazonas, Brazil. Yanomamua is unique in the Gentianaceae as an herb with sessile subcordate pandurate (fiddle-shaped) leaves, and inflorescences composed of oppositely paired solitary flowers situated in the axils of the upper three leaf pairs. Only...

Université de Neuchâtel

Sphenoderiidae (fam. nov.), a New Clade of Euglyphid Testate Amoebae Characterized by Small, Round Scales Surrounding the Aperture

Chatelain, Auriel P ; Meisterfeld, Ralf ; Roussel-Delif, Ludovic ; Lara, Enrique

In: Protist, 2013, vol. 164, no. 6, p. 782-792

Euglyphid testate amoebae are a highly conspicuous group of Cercozoa whose systematics is based mainly on the shape and ultrastructure of the shell. However, only a couple of species have been studied with molecular methods. As a consequence, there are still some genera whose classification remains uncertain. Amongst those are Sphenoderia and Trachelocorythion, two genera with...

Université de Neuchâtel

Phylogeny, systematics and ecology of free living protists : case study: family Hyalospheniidae

Kosakyan, Anush ; Mitchell, Edward (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2014.

Despite the fact that free-living protists compose the major part of Earth’s eukaryotic biodiversity and play numerous essential roles in ecosystems, knowledge on their true diversity, evolution and ecology remain highly limited. In this thesis I choose testate amoebae as a model group to address several key questions on the diversity, evolution and ecology of free-living protists. Family...

Université de Neuchâtel

Nests, petal usage, floral preferences, and immatures of Osmia (Ozbekosmia) avosetta (Megachilidae, Megachilinae, Osmiini), including biological comparisons with other osmiine bees

Rozen, Jerome George ; Özbek, Hikmet ; Ascher, John S. ; Sedivy, Claudio ; Praz, Christophe J. ; Monfared, Alireza ; Müller, Andreas

In: American Museum Novitates, 2010, vol. 3680, p. 1-22

To trace the evolution of host-plant choice in bees of the genus Chelostoma (Megachilidae), we assessed the host plants of 35 Palearctic, North American and Indomalayan species by microscopically analyzing the pollen loads of 634 females and reconstructed their phylogenetic history based on four genes and a morphological dataset, applying both parsimony and Bayesian methods. All species...

Université de Neuchâtel

Patterns of Host-Plant Choice in Bees of the Genus Chelostoma : The Constraint Hypothesis of Host-Range Evolution in Bees

Sedivy, Claudio ; Praz, Christophe J. ; Müller, Andreas ; Widmer, Alex ; Dorn, Silvia

In: Evolution, 2008, vol. 62, no. 10, p. 2487–2507

To trace the evolution of host-plant choice in bees of the genus Chelostoma (Megachilidae), we assessed the host plants of 35 Palearctic, North American and Indomalayan species by microscopically analyzing the pollen loads of 634 females and reconstructed their phylogenetic history based on four genes and a morphological dataset, applying both parsimony and Bayesian methods. All species...

Université de Neuchâtel

rRNA Phylogeny of Arcellinida (Amoebozoa) Reveals that the Largest Arcellinid Genus, Difflugia Leclerc 1815, is not Monophyletic

Gomaa, Fatma ; Todorov, Milcho ; Heger, Thierry J. ; Mitchell, Edward A. D. ; Lara, Enrique

In: Protist, 2012, vol. 163, no. 3, p. 389-399

The systematics of lobose testate amoebae (Arcellinida), a diverse group of shelled free-living unicellular eukaryotes, is still mostly based on morphological criteria such as shell shape and composition. Few molecular phylogenetic studies have been performed on these organisms to date, and their phylogeny suffers from typical under-sampling artefacts, resulting in a still mostly unresolved tree....

Université de Neuchâtel

Phylogenetics of tribe Exaceae (Gentianaceae) based on molecular, morphological and karyological data, with special emphasis on the genus Sebaea. : Taxonomic treatment of Exochaenium, Lagenias and the new genus Klackenbergia

Kissling, Jonathan ; Küpfer, Philippe (Dir.) ; Linder, Peter (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2007.

In an attempt to understand the evolutionary history of the poorly studied genus Sebaea and its relationship to other genera of tribe Exaceae (Gentianaceae), intensive morphological and karyological character optimization based on robust molecular phylogeny was performed. Phylogenetic reconstructions support the monophyly of Exaceae, and further reveal a polyphyletic Sebaea,...

Université de Neuchâtel

Andalucia (n. gen.)—the Deepest Branch Within Jakobids (Jakobida; Excavata), Based on Morphological and Molecular Study of a New Flagellate from Soil

Lara, Enrique ; Chatzinotas, Antonis ; Simpson, Alastair G. B.

In: Journal of Eukaryotic Microbiology, 2006, vol. 53, no. 2, p. 112-120

A new heterotrophic flagellate (Andalucia godoyi n. gen. n. sp.) is described from soil. Earlier preliminary 18S rRNA analyses had indicated a relationship with the phylogenetically difficult-to-place jakobid Jakoba incarcerata. Andalucia godoyi is a small (3–5 μm) biflagellated cell with a ventral feeding groove. It has tubular mitochondrial cristae. There are two major...