Sökning: "Evolution ryggradsdjur"

Hittade 3 uppsatser innehållade orden Evolution ryggradsdjur.

  1. 1. Body patterning and cognition in cephalopods - a literature review

    Master-uppsats, SLU/Dept. of Animal Environment and Health

    Författare :Georgina Chu; [2023]
    Nyckelord :cephalopods; octopus; body patterning; colour alteration; chromatophores; pigment cells; cognition; learning and memory;

    Sammanfattning : Cephalopods are a valuable model for studying the evolution of cognition due to their distinctive brain structure, organisation, and connectivity patterns compared to vertebrates. The development of large brains and behavioural complexities are believed to be triggered by evolutionary pressures stemming from factors like heightened predation, more demanding foraging conditions, and intense mating competition. LÄS MER

  3. 2. A Multi-Evidence Approach to the Affinity of Tylodus deltoides Rohon 1893

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Thomas Claybourn; [2015]
    Nyckelord :3D virtual palaeohistology; evolution; Silurian; Gnathostomata; Holocephali; Ohesaare; 3D-virtuell paleohistologi; evolution; Silur; Gnathostomata; Holocephali; Ohesaare;

    Sammanfattning : Early gnathostome evolution has recently undergone revision due to newly published phylogenies. Within this new framework, early gnathostomes in the fossil record can be revised, particularly the subject of this paper Tylodus deltoides (Rohon, 1893), vertebrate microremains from the Silurian Ohesaare Formation of Estonia. LÄS MER

  4. 3. Early to early Middle Ordovician conodont biostratigraphy of the Tamsalu drill core, central Estonia

    Magister-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Lisa Sjöstrand; [2003]
    Nyckelord :Ordovician; Latorpian; Volkhovian; Kundan; Aserian; conodonts; biostratigraphy; Parapaltodus n. sp. A; Texania sp. A; Tamsalu; Estonia; Earth and Environmental Sciences;

    Sammanfattning : This investigation examines the distribution of conodont elements in the Early to early Middle Ordovician Latorpian, Volkhovian, Kundan and Aserian stages of the Tamsalu drill core in central Estonia. Slightly more than 24, 600 conodont elements from 17 samples were examined, and the biostratigraphic results were compared to previous works on conodont biostratigraphy from localities in Estonia, Russia and Öland, Sweden. LÄS MER