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Oyster bioherms in the Bohemian Cretaceous Basin
Rantuch, Jakub ; Košťák, Martin (advisor) ; Frank, Jiří (referee)
Frustration from shape and size variability of oyster's species Rhynchostreon suborbiculatum (Lamarck) is long known phenomenon. In current state of his systematic it is not possible to consider it fully satisfying. Is it is shown in study of genus Gryphaea by Jones and Gould (1999), that application of modern analytical methods, undoubtly lightens long-darkned places of evolution process. Idea of Videt and Neraudeau (2003), that shape variability of Rhynchostreon suborbiculatum (Lamarck) probably also mirrors heterochronic processes, introduces inspirative and good foundation for future research in this field. Occurence of this oyster is proved from huge range of sites in Bohemian Cretaceous Basin area. It is combination of rich occurance, unique preservation and variability of lithological settings, which gives us unique starting point for next step to solve significant problem. Based on population analyses consisting of biometrical studies supported by oxygen isotope analyses, in future, it will be possible to reach sufficient conclusions of this issue, and progress in our knowledge.
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Unusual cockroaches (Blattidae) from Cenomanian Myanmar amber
Šmídová, Lucia ; Vršanský, Peter (advisor) ; Kočárek, Petr (referee)
The diploma thesis presents an overview of the extinct representatives of Blattidae, the still living cockroach family. Six already described species, belonging to three genera, have been confirmed. All of them lived during Cenozoic. Eight new morphotypes from Myanmar amber were recognized. Cenomanian Burmite with its exceptional state of preservation, allows a detailed study of the morphology of the inclusions. Six morphototypes belong to the family Blattidae. One morphotype belongs to the derived family Olidae studied herein. One female morphotype belongs to the still living family Ectobiidae, based on the presence of an attached ootheca. The work specifies the previous molecular analysis (J2-K1) and determines the divergence of Blattidae during Early Cretaceous. Any evidence and interpolations before 127Ma is not substantiated. Phylogenetic analysis confirmed Blattidae being parafyletic in respect to the family Olidae. The work emphasizes the need for changes in systematics of the Mesoblattinidae, the stem of the Blattidae. Amber is confirmed as the product of coniferous trees of the Araucariaceae family. Key words: Blattidae, taxonomy, phylogeny, Cenomanian, Myanmar amber
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Unusual cockroaches (Blattidae) from Cenomanian Myanmar amber
Šmídová, Lucia ; Vršanský, Peter (advisor) ; Kočárek, Petr (referee)
The diploma thesis presents an overview of the extinct representatives of Blattidae, the still living cockroach family. Six already described species, belonging to three genera, have been confirmed. All of them lived during Cenozoic. Eight new morphotypes from Myanmar amber were recognized. Cenomanian Burmite with its exceptional state of preservation, allows a detailed study of the morphology of the inclusions. Six morphototypes belong to the family Blattidae. One morphotype belongs to the derived family Olidae studied herein. One female morphotype belongs to the still living family Ectobiidae, based on the presence of an attached ootheca. The work specifies the previous molecular analysis (J2-K1) and determines the divergence of Blattidae during Early Cretaceous. Any evidence and interpolations before 127Ma is not substantiated. Phylogenetic analysis confirmed Blattidae being parafyletic in respect to the family Olidae. The work emphasizes the need for changes in systematics of the Mesoblattinidae, the stem of the Blattidae. Amber is confirmed as the product of coniferous trees of the Araucariaceae family. Key words: Blattidae, taxonomy, phylogeny, Cenomanian, Myanmar amber
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Oyster bioherms in the Bohemian Cretaceous Basin
Rantuch, Jakub ; Košťák, Martin (advisor) ; Frank, Jiří (referee)
Frustration from shape and size variability of oyster's species Rhynchostreon suborbiculatum (Lamarck) is long known phenomenon. In current state of his systematic it is not possible to consider it fully satisfying. Is it is shown in study of genus Gryphaea by Jones and Gould (1999), that application of modern analytical methods, undoubtly lightens long-darkned places of evolution process. Idea of Videt and Neraudeau (2003), that shape variability of Rhynchostreon suborbiculatum (Lamarck) probably also mirrors heterochronic processes, introduces inspirative and good foundation for future research in this field. Occurence of this oyster is proved from huge range of sites in Bohemian Cretaceous Basin area. It is combination of rich occurance, unique preservation and variability of lithological settings, which gives us unique starting point for next step to solve significant problem. Based on population analyses consisting of biometrical studies supported by oxygen isotope analyses, in future, it will be possible to reach sufficient conclusions of this issue, and progress in our knowledge.
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