Sökning: "Landmark morphometrics"

Hittade 4 uppsatser innehållade orden Landmark morphometrics.

  1. 1. Dynamics of Selachian (Shark) Dental Morphology During the Early Mesozoic

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Alexander Paxinos; [2017]
    Nyckelord :Early Mesozoic; Selachii; morphological disparity; geometric morphometrics; early radiation; Tidig Mesozoisk; Selachimorpha; morfologisk disparitet; geometrisk morfometri; tidig strålning;

    Sammanfattning : The ancestors of all modern day sharks and rays (Neoselachii) may have appeared during the Late Palaeozoic, but their major diversification happened sometime during the Early Mesozoic. Taxonomic evidence places the first neoselachian diversification in the Early Jurassic. LÄS MER

  3. 2. Diversity and Ecology of a Middle Campanian (Late Cretaceous) Marine Reptile Assemblage from Skåne, Southern Sweden

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Lena Källsten; [2015]
    Nyckelord :Landmark morphometrics; Marine amniotes; Cretaceous; Mosasauridae; Plesiosauridae; Aigialosuchus; Landmärkesbaserad morfometri; marina amnioter; Kritaperioden; Mosasauridae; Plesiosauridae; Aigialosuchus;

    Sammanfattning : This study has looked at an assemblage of fossilised teeth from Mesozoic marine amniotes from the Kristianstad basin in southern Sweden in order to make an estimate of the ecomorph diversity within said assemblage through looking at the morphology of the teeth. This was done as a pilot study to see if further studies would be able to produce worthwhile results. LÄS MER

  4. 3. Morphological variation in herring (Clupea harengus membras) : spring and autumn spawners in the Bothnian Sea

    Magister-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :Martina Blass; [2014]
    Nyckelord :morphometrics; body shape; freezing; shrinking;

    Sammanfattning : There are two spawning types of herring (Clupea Harengus m.) in the Bothnian sea. The aim of this thesis was to investigate if there are morphological differences between the spring and autumn spawners, and also study whether freezing affect the morphological measurements of herring. This was done by landmark based morphometrics. LÄS MER

  5. 4. Squamation in Andreolepis from the late Silurian of Sweden

    Master-uppsats, Evolution och utvecklingsbiologi; Institutionen för biologisk grundutbildning

    Författare :Donglei Chen; [2010]
    Nyckelord :;

    Sammanfattning : The origin of osteichthyans (bony fishes and tetrapods) dates back to the Late Silurian, but theearly evolution of osteichthyans is poorly understood. Andreolepis is one of the oldest knownosteichthyans, but exclusively documented by detached and fragmented dermal microremains. LÄS MER