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Monotypic Genus (monotypic + genus)

Distribution by Scientific Domains
Life Sciences66%
Earth and Environmental Science33%

Selected Abstracts

THE TAXONOMIC AND PHYLOGENETIC POSITION OF THE PLESIOSAUROIDEA FROM THE LOWER JURASSIC POSIDONIA SHALE OF SOUTH-WEST GERMANY

PALAEONTOLOGY, Issue 3 2007
FRANZISKA GROßMANNArticle first published online: 17 MAY 200
Abstract:, The two plesiosauroid species from the Posidonia shale of Holzmaden, ,Plesiosaurus'guilelmiimperatoris and ,Plesiosaurus'brachypterygius, do not belong to Plesiosaurus but form new monotypic genera. The new genus Hydrorion is erected for ,P.'brachypterygius, and the genus Seeleyosaurus is re-established for ,P.'guilelmiimperatoris. The recently described species Plesiopterys wildii is regarded as a junior synonym of S. guilelmiimperatoris. A short phylogenetic analysis shows that S. guilelmiimperatoris and Muraenosaurus are basal elasmosaurs. H. brachypterygius, Occitanosaurus tournemirensis from France and Microcleidus homalospondylus from England form a monophyletic clade, which is the sister taxon to the Cretaceous elasmosaurs. A palaeobiogeographical comparison of plesiosaur localities in the Lower Jurassic shows distinct palaeobiogeographical zones for the Toarcian, with different plesiosaur taxa in England, Germany and France. [source]

Generic disposition of Vicatia bipinnata in Melanosciadium and a new species (Umbelliferae)

FEDDES REPERTORIUM, Issue 7-8 2006
M. G. Pimenov Professor Dr.
Taxonomically critical Chinese species Vicatia bipinnata, treated early also in the genus Sino-dielsia, found to be morphologically similar to Melanosciadium H.Boissieu, a previously monotypic genus, also endemic to China. A new combination in Melanosciadium [M. bipinnatum (Shan RenHwa & Pu FaTing ex Shan Ren-Hwa et al.) Pimenov & Kljuykov] has been proposed. A new species, Melanosciadium genuflexumPimenov & Kljuykov, closely related to M. bipinnatum has been described. A key to determination of three species of Melanosciadium has been compiled. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Verschiebung von Vicatia bipinnata in die Gattung Melanosciadium und eine neue Art (Umbelliferae) Die taxonomisch kritische chinesische Art Vicatia bipinnata, früher auch zur Gattung Sinodielsia gestellt, erwies sich als morphologisch ähnlich mit dem ebenfalls in China endemischen Melanosciadium H.Boissieu, eine ursprünglich monotypische Gattung. Es wird die Neukombination Melanosciadium bipinnatum (Shan RenHwa & Pu FaTing ex Sha RenHwa et al.) Pimenov & Kljuykov, comb. nov. vorgeschlagen. Die mit M. bipinnatum nahe verwandte Art M. genuflexumPimenov & Kljuykov sp. nova wird neu beschrieben. Ein Bestimmungsschlüssel für die drei Arten von Melanosciadium wird vorgelegt. [source]

Molecular Phytogeny and Evolution of Mosquito Parasitic Microsporidia (Microsporidia: Amblyosporidae),

THE JOURNAL OF EUKARYOTIC MICROBIOLOGY, Issue 1 2004
CHARLES R. VOSSBRINCK
ABSTRACT. Amblyospora species and other aquatic Microsporidia were isolated from mosquitoes, black flies, and copepods and the small subunit ribosomal RNA gene was sequenced. Comparative phylogenetic analysis showed a correspondence between the mosquito host genera and their Amblyospora parasite species. There is a clade of Amblyospora species that infect the Culex host group and a clade of Amblyospora that infect the Aedes/Ochlerotatus group of mosquitoes. Parathelohania species, which infect Anopheles mosquitoes, may be the sister group to the Amblyospora in the same way that the Anopheles mosquitoes are thought to be the sister group to the Amblyosporo and Aedes mosquitoes. In addition, by sequence analysis of small subunit rDNA from spores, we identified the alternate copepod host for four species of Amblyospora. Amblyospora species are specific for their primary (mosquito) host and each of these mosquito species serves as host for only one Amblyospora species. On the other hand, a single species of copepod can serve as an intermediate host to several Amblyospora species and some Amblyospora species may be found in more than one copepod host. Intrapredatorus barn, a species within a monotypic genus with Amblyospora-like characteristics, falls well within the Amblyospora clade. The genera Edhazardia and Culicospora, which do not have functional meiospores and do not require an intermediate host, but which do have a lanceolate spore type which is ultrastructurally very similar to the Amblyospora spore type found in the copepod, cluster among the Amblyospora species. In the future, the genus Amblyospora may be redefined to include species without obligate intermediate hosts. Hazardia, Berwaldia, Larssonia, Trichotuzetia, and Gurleya are members of a sister group to the Amblyospora clades infecting mosquitoes, and may be representatives of a large group of aquatic parasites. [source]

Weiwoboidae fam. nov. of ,Higher' Fulgoroidea (Hemiptera: Fulgoromorpha) from the Eocene Deposits of Yunnan, China

ACTA GEOLOGICA SINICA (ENGLISH EDITION), Issue 4 2010
LIN Qibin
Abstract: A new family of so-called ,higher' planthoppers, Weiwoboidae fam. nov., from the Lower Eocene of Yunnan is described. A new monotypic genus, Weiwoboa gen. nov., with Weiwoboa meridiana sp. nov. is also described and illustrated. The characters of tegmen venation of the new family, its evolution, and supposed relationships are briefly discussed. [source]

A revision of Cerdia (Caryophyllaceae)

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 1 2006
VICTORIA SOSA
Cerdia is a poorly understood genus of minute cushiony plants endemic to Mexico that is traditionally placed in subfamily Paronychioideae, tribe Polycarpeae (Caryophyllaceae). Morphological observations and phylogenetic analysis of ITS DNA sequences were carried out to determine the number of species, heretofore controversial, that constitute the genus as well as its position within Caryophyllaceae. Samples of Cerdia were collected through its entire range of distribution and together with previous specimens were used in morphological analyses. Nineteen terminal taxa were considered in a phylogenetic analysis with representatives of the different lineages in Caryophyllaceae. Results indicated that Cerdia is a monotypic genus, including only one variable species, C. virescens, but its phylogenetic affinities remain doubtful. © 2006 The Linnean Society of London, Botanical Journal of the Linnean Society, 2006, 152, 1,13. [source]

Exorhopala ruficeps (Balanophoraceae): morphology and transfer to Helosis

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 4 2004
ROLAND K. EBERWEIN
Exorhopala ruficeps is a rare parasitic plant of the family Balanophoraceae, endemic to the north-western part of Peninsular Malaysia. It was originally described in Rhopalocnemis and later placed in a new monotypic genus on the basis of the exogenous origin of its inflorescences. A new collection of material enabled a detailed morphological study, the results of which are presented here. Inter alia, it is documented that the inflorescences originate endogenously as in all other Balanophoraceae. However, no volva is formed and the tuber-tissue covering the emerging inflorescence crumbles into pieces. The inflorescence and flower characters established here are neither in full accordance with Rhopalocnemis nor do they justify a genus of its own, but instead place the species in Helosis, which thus becomes a genus of transpacific distribution. The new combination is Helosis ruficeps (Ridl.) R. K. Eberwein. © 2004 The Linnean Society of London, Botanical Journal of the Linnean Society, 2004, 146, 513,517. [source]