Essays about: "Cretaceous"

Showing result 11 - 15 of 31 essays containing the word Cretaceous.

  1. 11. Disparity of Early Cretaceous Lamniformes sharks

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Fredrik Söderblom; [2015]
    Keywords : Lamniformes; disparity; Early Cretaceous; morphology; morphometric; Lamniformes; disparitet; tidig krita; morfologi; morfometri;

    Abstract : The geological range of lamniform sharks stretches from present day species such as Carcharodon carcharias (great white shark) back to the at the moment oldest undoubted fossil finds during the Early Cretaceous. In this paper a geometric morphometric analysis was performed on images of Early Cretaceous lamniform teeth collected from published literature in order to examine the change in disparity (range of morphological variation within a group) throughout the time period. READ MORE

  3. 12. Postcranial anatomy of Tanius sinensis Wiman, 1929 (Dinosauria; Hadrosauroidea)

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Niclas Borinder; [2015]
    Keywords : Tanius; Jiangjunding; postcranial; hadrosauroid; phylogeny;

    Abstract : Tanius sinensis Wiman, 1929 was one of the first hadrosauroid or “duck-billed” taxa erected from China, indeed one of the very first non-avian dinosaur taxa to be erected based on material from the country. Since the original description by Wiman in 1929, the anatomy of T. READ MORE

  4. 13. Testing the Cretaceous Diversity of Ichthyosaurs and Their Extinction Hypotheses Using a Quantitative Approach

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Naz Acikkol; [2015]
    Keywords : diversity; ichthyosaurs; extinction; belemnites; ammonites; prey; predator; rock record; sampling bias; Cretaceous; mångfald; utdöende; fisködlor; belemniter; rovdjur; byte;

    Abstract : As portrayed in Before the Dinosaur: the Historical Significance of the Fossil Marine Reptiles, ichthyosaurs, as other Mesozoic marine amniotes, have been unfairly overshadowed by dinosaurs in both popular culture and the field of vertebrate palaeontology. Yet by the effort of dedicated researchers, work on these fish-like marine reptiles had never died out, and in fact a second wave of interest emerged in the late 20th century. READ MORE

  5. 14. Tooth Replacement of Euhelopus zdanskyi (Dinosauria: Sauropoda) and the Evolution of Titanosaurian Tooth Morphology

    University essay from Uppsala universitet/Paleobiologi

    Author : Seela Salakka; [2014]
    Keywords : Euhelopus; Sauropoda; tooth replacement; tooth morphology; evolution; Titanosauria;

    Abstract : Sauropod tooth morphologies and tooth replacement patterns bear important information on feeding habits and sauropod evolution. Euhelopus zdanskyi is an Early Cretaceous neosauropod, and belongs to the group Euhelopodidae, which is the sister group of Titanosauria. READ MORE

  6. 15. Long bone and vertebral microanatomy and osteo-histology of ’Platecarpus’ ptychodon (Reptilia, Mosasauridae) : implications for marine adaptations

    University essay from Lunds universitet/Geologiska institutionen

    Author : Miriam Heingård; [2014]
    Keywords : benhistologi; mikroanatomi; mosasaurier; akvatisk anpassning; tillväxthastighet; bone histology; bone microanatomy; mosasaurs; aquatic adaptations; growth rate; Earth and Environmental Sciences;

    Abstract : The inner bone architecture and histology provide information about life history traits of extant as well as extinct animals. Mosasaurs (family Mosasauridae) are a group of secondarily adapted marine squamates that radiated in the Late Cretaceous, resulting in the evolution of a body plan adapted for pelagic habitats. READ MORE