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Revision of historical ichthyosaur fossils (Ichthyosauria, Reptilia) in the collections of the Chlupáč's Museum of Earth History
Rollingerová, Nicola ; Mazuch, Martin (advisor) ; Chroust, Milan (referee)
The presented thesis deals with ichthyosaur fossils in the collections of the Chlupač Museum of the History of the Earth (hereafter CHMHZ). Specifically, these are five original specimens originating from the areas of Holzmaden, Germany (four specimens in total) and Hallein, Austria (one specimen). The main goal of the work is a detailed description and identification of all five original specimens. At the same time, this work answers the question whether the original determination of the fossils corresponds to the current systematics of this group. The work also pays attention to the geology of the areas from which the fossils come, the paleobiology of these animals and the current form of their phylogeny and systematics. This work finds that the original identification of the fossils in most cases does not correspond to the current systematics and proposes a new classification for three of the five specimens. All specimens from the Holzmaden site (4 in total) belong to the genus Stenopterygius and are represented by two species: S. quadriscissus (3 specimens) and S. uniter (1 specimen). The fossil from Hallein is in extremely poor condition, so its assignment is based on geographic and stratigraphic data. In this case, the specimen remains in the original genus classification: Mixosaurus.
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Development of the climate during the Miocene based on the study of reptilian associations in northwest Bohemia
Chroust, Milan ; Mazuch, Martin (advisor) ; Zajíc, Jaroslav (referee) ; Sabol, Martin (referee)
The PhD thesis is about fossil crocodiles and turtles from the Most basin and their implication in paleoclimatic and paleoecological reconstruction. The thesis is composed of accompanying text together with four separate scientific papers included in the attachment. Dozens of bony fragments, which belong to fossil crocodiles and turtles, are known from the Most basin (NW Bohemia, Czechia). Surprisingly, the high biodiversity of fossil turtles was revealed. According to a study of fossil crocodiles and turtles we are able to reconstruct the ancient landscape (i.e., ecosystems), mean annual temperatures together with the extremes in summer and winter periods. However, for the proper reconstruction of paleotemperatures, the taxonomic description is mandatory. Fossil crocodiles and turtles lack the systematic review, while they are in fact the most abundant material compared to other fossil vertebrates (i.e., mammals, birds, etc.). Crocodylian material belongs to the genus Diplocynodon and thanks to the cranial material from the Tušimice site, we are able to describe it as Diplocynodon ratelii. The soft-shell turtles (Trionychinae) from the Břešťany site are described as Rafetus bohemicus including the new diagnostic characters. Another trionychid material is for now impossible to determine at the...
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Review of representatives of the genus Diplocynodon [Diapsida, Crocodylia] from Czech Republic
Chroust, Milan ; Mazuch, Martin (advisor) ; Přikryl, Tomáš (referee)
The genus Diplocynodon is a basal alligatoroid with a range of endemic distribution in Europe. The oldest known founds are from Late Palaeocen and the youngest known founds are from Late Miocene. Fossils of this specimen are known also from the Czech republic. In the Master thesis were collected more than 600 founds, mostly fragmentary. In the collections of University of Vienna was found almost complete skull of probably genus Diplocynodon darwini from the Czech republic. The main goal of Master thesis is to make a complexe catalogue of Diplocynodon material from the Czech republic. Key words: Crocodylia, Diplocynodon, Czech republic
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Review of representatives of the genus Diplocynodon [Diapsida, Crocodylia] from Czech Republic
Chroust, Milan ; Mazuch, Martin (advisor) ; Přikryl, Tomáš (referee)
The genus Diplocynodon is a basal alligatoroid with a range of endemic distribution in Europe. The oldest known founds are from Late Palaeocen and the youngest known founds are from Late Miocene. Fossils of this specimen are known also from the Czech republic. In the Master thesis were collected more than 600 founds, mostly fragmentary. In the collections of University of Vienna was found almost complete skull of probably genus Diplocynodon darwini from the Czech republic. The main goal of Master thesis is to make a complexe catalogue of Diplocynodon material from the Czech republic. Key words: Crocodylia, Diplocynodon, Czech republic
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Evolution of crocodiles (Crocodilia, Archosauria)
Chroust, Milan ; Mazuch, Martin (advisor) ; Přikryl, Tomáš (referee)
Crocodiles (Crocodilia) during their evolution have created many diverse forms. In this work is described their phylogenetic progress with a description of the important groups and taxonomical classification into the families. The classification is based on elder literature upgraded by actual commentaries. The work describes some of their anatomic and morphologic characters mostly of the recent species, which differentiates them from other reptiles or birds groups. In the Czech Republic were founded some crocodile's fragments belongs to genus Diplocynodon from Most Miocene basin. This work includes previous research of these finds. Key words: Crocodilia, evolution, Diplocynodon, Czech Republic
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