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History
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mikado Aachen | im Haus missio
Datenschutz-ÜbersichtDie Internetseiten verwenden teilweise so genannte Cookies. Cookies richten auf Ihrem Rechner keinen Schaden an und enthalten keine Viren. Cookies dienen dazu, unser Angebot...
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Glossary | EAFO
Acronym Full Name Category Description BEV Battery electric vehicle Vehicle Also known as all-electric vehicle, BEV's has all...
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A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system
A new species of tyrannosaurid from the upper Two Medicine Formation of Montana supports the presence of a Laramidian anagenetic (ancestor-descendant) lineage of Late Cretaceous tyrannosaurids. In concert with other anagenetic lineages of dinosaurs from the same time and place, this suggests that anagenesis could have been a widespread mechanism generating species diversity amongst dinosaurs, and perhaps beyond. We studied the excellent fossil record of the tyrannosaurid to test that hypothesis. Phylogenetic analysis places this new taxon as the sister species to Daspletosaurus torosus. However, given their close phylogenetic relationship, geographic proximity, and temporal succession, where D. torosus (~76.7-75.2 Ma) precedes the younger new species (~75.1-74.4 Ma), we argue that the two forms most likely represent a single anagenetic lineage. Daspletosaurus was an important apex predator in the late Campanian dinosaur faunas of Laramidia; its absence from later units indicates it was extinct before Tyrannosaurus rex dispersed into Laramidia from Asia. In addition to its evolutionary implications, the texture of the facial bones of the new taxon, and other derived tyrannosauroids, indicates a scaly integument with high tactile sensitivity. Most significantly, the lower jaw shows evidence for neurovasculature that is also seen in birds.
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IRC Help | LivingInternet
Fortunately, most of the locals are actually friendly. In fact, the Net actually has a rich tradition of helping out visitors and newcomers. – Adam Gaffin; EFF’s Guide to the Internet; December 11, 1996. See...
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1 TH 9-310 YP-408.pdf
60% found this document useful (5 votes)2K views163 pages1 TH 9-310 Yp-408 PDFTHE OPERATIONAL MANUAL OF THE DUTCH DAF YP-408 ARMOURED CAR FOR THE INFANTERY. THE PREFIX 1 INDICATES THAT IT IS DESTINED FOR THE...
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Gender-Specific Reproductive Tissue in Ratites and Tyrannosaurus rex
Unambiguous indicators of gender in dinosaurs are usually lost during fossilization, along with other aspects of soft tissue anatomy. We report the presence of endosteally derived bone tissues lining the interior marrow cavities of portions of Tyrannosaurus rex (Museum of the Rockies specimen number 1125) hindlimb elements, and we hypothesize that these tissues are homologous to specialized avian tissues known as medullary bone. Because medullary bone is unique to female birds, its discovery in extinct dinosaurs solidifies the link between dinosaurs and birds, suggests similar reproductive strategies, and provides an objective means of gender differentiation in dinosaurs.
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Mémoires de la Société royale des antiquaires de France tome XVIII. - Persée
MÉMOIBES DE LA SOCIÉTÉ ROYALE DES ANTIQUAIRES DE FRANCE , tome XVIII (8e de la nouvelle série). — Un vol. in-8° de 519 pages , avec planches et gravures sur bois. Paris, 1846, chez Dumoulin. Le plus utile...
