A pygostyle from a non-avian theropod
Article Abstract:
It has been possible to identify a pygostyle from a non-avian theropod, an oviraptorosaur from the Upper Cretaceous Nemegt Formation of Bugin Tsav, Mongolia. The specimen has most vertebrae, as well as ribs, chevrons, pelvis, tibiae, femora, gastralia, proximal tarsals and fibulae. The pygostyle is a quite straight, tapering co-ossified mass. The short tail and pygostyle of this specimen suggests a fan of elongate tail features in oviraptorosaurs that is more derived than in Caudipteryx.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
Quality of the fossil record through time
Article Abstract:
A database of 1,000 morphological and molecular cadograms was compiled and sorted into lineages arising in the Palaeozoic, Mesozoic or Cenozoic. Sample sizes and tree sizes were fairly uniform and the relative congruence of age and clade data showed no clear increase from most ancient to most recent. This provides a more convincing analytical tool, offering independent data on history.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
Fine structure of bone in dinosaurs, birds and mammals
Article Abstract:
Research is presented concerning the histology of bone from mammals, birds and dinosaurs. The differing arrangement of canaliculi in the bones of different groups of dinosaurs is discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Growth of an isolated elk population. Estimated age structure of wolves in northeastern Minnesota
- Abstracts: Effects of novel colour and smell on the response of naive chicks towards food and water. Odour and colour as cues for taste-avoidance learning in domestic chicks
- Abstracts: Sustained star formation in the central stellar cluster of the Milky Way. Hard-pressed molecular clouds
- Abstracts: Gravitational constraints on the internal structure of Ganymede. Discovery of Ganymede's magnetic field by the Galileo spacecraft
- Abstracts: Interleukin-16 or not? Involvement of chemokine receptors in breast cancer metastasis. A new class of membrane-bound chemokine with a CX3C motif