Nom. Nov. (nom. + nov)

Distribution by Scientific Domains


Selected Abstracts


The basidiomycete genus Polyporus , an emendation based on phylogeny and putative secondary structure of ribosomal RNA molecules

FEDDES REPERTORIUM, Issue 7-8 2004
D. Krüger
The fungal genus Polyporus is an assemblage of white-rotting lignicolous basidiomycetes. It has undergone considerable expansion and contraction over a period of two and three quarter centuries. Current generic circumscription of Polyporus has kept the genus non-monophyletic. Species of Polyporus infrageneric group Polyporellus are closely related to some species of Lentinus. We introduce data for ITS2 spacer rRNA secondary structure evolution by quasi-independent comparison with large subunit rRNA phylogeny, and suggest a fraction of primary nuclear rDNA ITS sequence data as novel taxonomic character. A major taxonomic shift is suggested, supported by molecular and morphological characters, and allowing inclusion of species with gilled hymenophores in Polyporus. Two new names are proposed: Polyporus phyllostipes D.Krüger, nom. nov. and Polyporus gerdai D.Krüger, nom. nov. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Die Gattung Polyporus (Basidiomycetes) , eine Emendation auf der Basis von Phylogenie und mutmaßlicher sekundärer Struktur der ribosomalen RNA-Moleküle Die Pilzgattung Polyporus, eine Gruppe Weißfäule erregender holzbewohnender Basidiomyceten, wurde über nahezu drei Jahrhunderte vielfach expandiert und verkleinert. Bei der derzeitigen Gattungsumschreibung von Polyporus gilt die Gattung als nicht-monophyletisch. Arten der Polyporus -Gruppe Polyporellus sind eng verwandt zu einigen Lentinus- Arten. Anhand quasi-unabhängigem Vergleich mit der Phylogenie der rRNA der großen Untereinheit (LSU) stellen wir Daten zur Evolution der ITS2 Spacer rRNA vor, und schlagen ein ITS Kern-rDNA-Fragment als taxonomisches Merkmal vor. Unterstützt mit molekularen und morphologischen Daten wird eine grundlegende taxonomische Verschiebung vorgeschlagen, welche Arten mit Lamellen-Hymenophoren in Polyporus erlaubt. Zwei neue Namen werden vorgeschlagen: Polyporus phyllostipes D.Krüger, nom. nov. und Polyporus gerdai D.Krüger, nom. nov. [source]


TAXONOMY AND ZOOGEOGRAPHY OF THE MESOZOIC CYTHERURID OSTRACODA FROM WEST-CENTRAL ARGENTINA

PALAEONTOLOGY, Issue 1 2009
SARA C. BALLENT
Abstract:, The status of thirty four species of the cytheroidean ostracod family Cytheruridae from the Neuquén Basin, west-central Argentina is reviewed. These species belong to the following nine genera: Eucytherura Müller, ranging in this study from Pliensbachian to Valanginian and represented by fourteen species; Kangarina Coryell and Fields, Aalenian,Bajocian, with a single species; Acrocythere Neale, Hauterivian, one species; Paranotacythere Bassiouni, Berriasian, two species; Procytherura Whatley, Pliensbachian to Hauterivian, twelve species; Cytheropteron Sars, Aalenian,Bajocian, one species: Eocytheropteron Alexander, Hauterivian, one species; Paradoxorhyncha Chapman, Aalenian,Bajocian, one species; and Paracytheridea Müller, Berriasian, one species. Of the three subfamilies of the Cytheruridae, the Cytherurinae, with thirty species are by far the most numerous and abundant throughout the study. The other two subfamilies, the Cytheropterinae are represented by three species and the Paracytherideinae by a single species of the nominative genus. Several of the species are very widely distributed geographically and have, for example, also been recorded from Europe; others indicate close links with South Africa and Australia. The stratigraphical ranges of certain genera have been extended as a result of this study. For example, Kangarina has not previously been recorded below the Cretaceous. The Cytheruridae are clearly the most diverse cytheroidean ostracodes in the Mesozoic of the Neuquén Basin and are more diverse than all other groups of ostracodes combined. Four new species, Eucytherura tessae, Eucytherura yunga, Procytherura amygdala and Eocytheropteron immodicus are described. Eucytherura guillaumeae nom. nov. for Eucytherura tuberculata Brenner and Oertli and Eucytherura paranuda nom. nov. for Eucytherura nuda (Brand) are proposed. [source]


Observations on Fragilaria longifusiformis comb. nov. et nom. nov. (Bacillariophyceae), a widespread planktic diatom documented from North America and Europe

PHYCOLOGICAL RESEARCH, Issue 3 2006
Peter A. Siver
SUMMARY Synedra planktonica was originally described by Hains and Sebring from a freshwater locality in the south-eastern USA using light and transmission electron microscopy. The authors placed S. planktonica into the genus Synedra Ehrenberg because of its solitary habit and lack of marginal linking spines. Since the original description of S. planktonica, the concepts of Synedra and the related genus Fragilaria Lyngbye have undergone significant change and debate. Today, details of the areolae, apical pore fields, cingulum and rimoportulae, all lacking in the original description of S. planktonica, are now commonly used to distinguish between taxa in Fragilaria, Synedra and related genera. We provide details of these ultrastructural characters for S. planktonica based on specimens collected from the type locality, along with observations of cells from other sites in North America and Europe. Based on these findings, an emended description is presented for S. planktonica and the taxon is transferred to Fragilaria, as F. longifusiformis comb. nov. et nom. nov. According to the International Code of Botanical Nomenclature, the epithet planktonica could not be applied because it was previously used to describe a marine species of Fragilaria. We discuss the relationship of S. planktonica with morphologically similar taxa, including the genus Reimerothrix Prasad. [source]


Phylogeny, evolution and systematics of Moehringia (Caryophyllaceae) as inferred from molecular and morphological data: a case of homology reassessment

CLADISTICS, Issue 4 2007
Simone Fior
The phylogeny of the genus Moehringia (Caryophyllaceae) is investigated by means of analyzing nuclear (ITS) and chloroplast (matK) sequence data in combination with morphological characters. Parsimony and Bayesian methods yield consistent results, and a common phylogenetic signal is shared by the nuclear and chloroplast data. Morphological characters are affected by a high level of homoplasy, but they provide valuable information when analyzed in combination with the molecular data. Moehringia is paraphyletic to Arenaria with the Iberian taxa belonging to Moehringia sect. Pseudomoehringia McNeill more closely related to Arenaria. This cladistic evidence led us to reinterpret the homology of the key character used in most, if not all, floras, to separate Moehringia from Arenaria, i.e., the seed strophiole. Thorough anatomical studies were carried out to elucidate the ontogeny of the strophiole, which proved different in Moehringia s. str. and the Iberian taxa. Within Moehringia s. str., two sister clades are recognized (i.e., Moehringia sect. Moehringia and M. sect. Latifoliae much as recognized by McNeill, whereas representatives of M. sect. Diversifoliae are assigned to either groups), and biogeographical events related to the Würm glaciation are considered to play a fundamental role in the evolution and present distribution of the genus. The variation of the strophiole is regarded as adaptability to ecological conditions and dispersal agents. We also propose two new combinations and two replacement names: Arenaria glochidisperma (J.M. Mont.) Fior et P.O. Karis, comb. nov., Arenaria tejedensis (Willk.) Fior et P.O. Karis, comb. nov., Arenaria suffruticosa Fior et P.O. Karis, nom. nov. for Moehringia intricata Willk., and Arenaria funiculata Fior et P.O. Karis, nom. nov. for Moehringia fontqueri Pau. © The Willi Hennig Society 2007. [source]