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Echinoids, their evolution and response to the Cretaceous paleoenvironmental events
Hedánková, Karolína ; Košťák, Martin (advisor) ; Nohejlová, Martina (referee)
The bachelor thesis briefly summarizes knowledges about the evolution of sea urchins (Echinoidea; Echinodermata) with a focus on the successful order Spatangoida and their diversification in the dynamic Mesozoic environment. Attention is paid in particular to significant palaeoceanic changes, such as anoxic events (OAE = Oceanic Anoxic Event) and extinctions. Responses to OAE1-OAE3, as well as the last mass extinction (within the "Big Five") at the Cretaceous-Paleogene (K-Pg) boundary, are briefly discussed. Sea urchins, as an important part of benthic communities, prove to be a suitable model group not only for understanding the dynamics of evolution, but also successful strategies for surviving crisis events and new adaptations. Key words: Mesozoic, echinoids, evolution, events
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Association of Turonian echinoids at the Nebužely locality (Bohemian Cretaceous Basin)
Bartušková, Nikola ; Fatka, Oldřich (advisor) ; Ziegler, Václav (referee)
This diploma thesis is focused on morphological studies and taxonomic analyses of small regular and irregular echinoids found at the Nebužely locality; at this locality clastic sediments of Teplice Formation of Bohemian Cretaceous Basin are exposed. Presence of the belemnite Praeaxtinocamax bohemicus makes possible to assign the outcrop to late Turonian. Detailed morphological study of more than one hundred specimens enabled to distinguish four echinoids species (Echinogalerus, Glyphocyphus, Nucleolites, Phymosoma), less favourably preserved and/or very limited material is classified as belonging to two orders (Cidaroida, Holectypoida) and one family (Phymosomatidae), respectively. The next part of the thesis contains a possible palaeoecological reconstruction of the environment at the studied locality. Based on bathymetrically indicative molluscs, a shallow−water palaeoenvironment is suspected for this locality. Key words: echinoid, Bohemian Cretaceous Basin, Turonian
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Association of Turonian echinoids at the Nebužely locality (Bohemian Cretaceous Basin)
Bartušková, Nikola ; Fatka, Oldřich (advisor) ; Ziegler, Václav (referee)
This diploma thesis is focused on morphological studies and taxonomic analyses of small regular and irregular echinoids found at the Nebužely locality; at this locality clastic sediments of Teplice Formation of Bohemian Cretaceous Basin are exposed. Presence of the belemnite Praeaxtinocamax bohemicus makes possible to assign the outcrop to late Turonian. Detailed morphological study of more than one hundred specimens enabled to distinguish four echinoids species (Echinogalerus, Glyphocyphus, Nucleolites, Phymosoma), less favourably preserved and/or very limited material is classified as belonging to two orders (Cidaroida, Holectypoida) and one family (Phymosomatidae), respectively. The next part of the thesis contains a possible palaeoecological reconstruction of the environment at the studied locality. Based on bathymetrically indicative molluscs, a shallow−water palaeoenvironment is suspected for this locality. Key words: echinoid, Bohemian Cretaceous Basin, Turonian
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Recent knowledge of sea urchins in the Bohemian Cretaceous Basin
Bartušková, Nikola ; Fatka, Oldřich (advisor) ; Vodrážka, Radek (referee)
This thesis is focused on an overview of recent knowledge of sea urchins in the Bohemian Cretaceous Basin. In the first part is a summary of basic information about Bohemian Cretaceous Basin, including chronostratigraphic, lithostratigraphic classification and palaeogeography. The second part of the thesis contains an overview of partial synonymy of echinoids of the given regional - geological unit. Mentioned are also strata, from which are sea urchins described. Key words: sea urchins, Bohemian Cretaceous Basin
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