Crustacea (Decapoda, Cirripedia) z české křídové pánve

Předkládaná práce se zabývá systematickou revizí, evolučními trendy, paleoekologií a paleogeografií korýšů ze skupin Decapoda a Cirripedia pocházejících ze svrchní křídy české křídové pánve. Práce je prezentována jako soubor devíti samostatných článků, které byly publikovány v recenzovaných odborných časopisech. V jednotlivých článcích je popisován nejen materiál z muzejních kolekcí, ale i noví jedinci nasbíraní během posledních deseti let. Disertační práce navíc obsahuje i poznámky z článků v přípravě (týká se to rodů Paraclythia a Oncopareia a acrothoracidních svijonožců). Vzhledem k tomu, že korýši z české křídové pánve byli naposledy studováni na přelomu 19. a 20. století (poté částečně revidováni v první polovině 20. století) a od té doby se velmi změnily metody používané v systematice a taxonomii, jsou publikované studie zaměřeny především na moderní popis taxonů. Nedílnou součástí této práce je tak i kapitola o tafonomii a jejím významu při určování fosilních jedinců. Díky moderní revizi byly v článcích popsány nové druhy Ctenocheles fritschi (Decapoda: Axiidea: Ctenochelidae), Archaeochionelasmus nekvasilovae (Cirripedia: Thoracica: Balanomorpha), Myolepas reussi (Cirripedia: Thoracica: Myolepadidae) a Capitulum sklenari (Cirripedia: Thoracica: Pollicipedidae). C. fritschi je jeden z...This thesis deals with systematic revision, evolutionary trends, palaeoecology and migration patterns of crustaceans (Cirripedia and Decapoda) from the Upper Cretaceous of the Bohemian Cretaceous Basin. Thesis is presented as a compilation of 9 papers that were published in scientific peer-reviewed journals and includes not only old museum material, but also numerous crustacean specimens which have been recovered in the last decade. Besides, short remarks on fossil crustaceans currently under study or in the process of being published (Paraclythia, Oncopareia, Acrothoracica) are also included in this thesis. In view of the fact that the fossil crustaceans from the BCB were most recently recorded in the turn of the 19th and the 20th centuries (and partially revised in the first half of the 20th century) and since the systematics and taxonomy have changed significantly, all papers presented here focus primarily on systematic revision and modern description. The essential part of the thesis thus deals with taphonomy and its bearing on the identification of fossil material. Thanks to a modern description, new species of Ctenocheles fritschi (axiidean shrimp), Archaeochionelasmus nekvasilovae (acorn barnacle), Myolepas reussi and Capitulum sklenari (pedunculate barnacles) were erected. C. fritschi is...Ústav geologie a paleontologieInstitute of Geology and PaleontologyPřírodovědecká fakultaFaculty of Scienc

Crustacea (Decapoda, Cirripedia) from the Bohemian Cretaceous Basin

This thesis deals with systematic revision, evolutionary trends, palaeoecology and migration patterns of crustaceans (Cirripedia and Decapoda) from the Upper Cretaceous of the Bohemian Cretaceous Basin. Thesis is presented as a compilation of 9 papers that were published in scientific peer-reviewed journals and includes not only old museum material, but also numerous crustacean specimens which have been recovered in the last decade. Besides, short remarks on fossil crustaceans currently under study or in the process of being published (Paraclythia, Oncopareia, Acrothoracica) are also included in this thesis. In view of the fact that the fossil crustaceans from the BCB were most recently recorded in the turn of the 19th and the 20th centuries (and partially revised in the first half of the 20th century) and since the systematics and taxonomy have changed significantly, all papers presented here focus primarily on systematic revision and modern description. The essential part of the thesis thus deals with taphonomy and its bearing on the identification of fossil material. Thanks to a modern description, new species of Ctenocheles fritschi (axiidean shrimp), Archaeochionelasmus nekvasilovae (acorn barnacle), Myolepas reussi and Capitulum sklenari (pedunculate barnacles) were erected. C. fritschi is..

Dynomenid crabs (Decapoda, Brachyura) from Upper Cenomanian-Lower Turonian nearshore, shallow-water strata in the Bohemian Cretaceous Basin, Czech Republic abstract /

Tyt. z nagłówka.Art. jest abstr. referatu z konferencji.Bibliogr. s. 90.Conditions of preservation of small crabs at nearshore deposits in the Bohemian Cretaceous Basin (BCB) were poor and fossil record is mostly restricted to fragmentary pereiopods, i.e. isolated propodi or dactyli, whereas crab carapaces in the area are rather rare. Excluding three specimens of dynomenid Graptocarcinus texanus Roemer, 1887 and one necrocarcinid carapace fragment, no other carapaces are known from the nearshore deposits of the BCB. These partially crushed carapaces lacking chelipeds or other appendages come from the lower Turonian calcareous siltstones at Kamajka. By contrast, crab claws and isolated dactyli are more common in the BCB, but notoriously difficult to identify (Jagt et al. 2010, Veselska 2011). In view of the confused taxonomy of isolated claws, its identity has not been recognised and claws were described as fragments of the necrocarcinid species Necrocarcinus avicularis Fritsch (in Fritsch & Kafka 1887). However morphology of crab chelipeds originally described as N. avicularis is in fact typical of graptocarcinines (dynomenids); claws are covered with small tubercles and are rectangular in outline with a distinctive bulge on propodus/carpus articulation. The bulge closed the space between propodus and carpus when bent and probably protected the claws when crabs moved between coral colonies or during feeding, similar to extant dynomenids (Jagt et al. 2010, Van Bakel et al. 2012, Kocova Veselska et al., submitted). Jagt et al. (2010) prefer to use parataxonomy for such cases and suggest using "form genus" Roemerus Bishop, 1983 for isolated dynomenid chelae. Between 2001 and 2013, the authors conducted field works in the upper Cenomanian-lower Turonian nearshore, shallow-water bioclastic limestones to marly siltstones at Velim, Chrtniky and Kamajka situated approximately 60-100 km east of Prague along the southern and eastern margins of the BCB, which are interpreted to have been laid down under high-energy conditions (Zitt et al. 1997a, b). During these sessions, 200 kg of rubble were amassed and screened through a 1 mm-sieve with a result of an additional isolated dactyli and cheliped fragments. Whereas strata containing brachyuran crabs at Kamajka are exclusively of early Turonian age, crustaceans from Chrtniky and Velim are from upper Cenomanian and early Turonian nearshore sediments alike. A recent re-examination of these new finds together with crab chelipeds originally described as N. avicularis deposited in the National Museum (Prague) has revealed that all alleged necrocarcinid claws or dactyli from nearshore strata in the BCB indeed correspond to the diagnosis of the dynomenid "form genus" Roemerus, in size, ornament, development of the fixed and movable fingers and presence of ovate depressions in dactylus and fixed finger (Veselska 2011, Kocova Veselska et al., submitted). Although still not found connected with carapaces, these claws may be conspecific with the co-occurring, carapace-based species, G. texanus, at Kamajka.Dostępny również w formie drukowanej.KEYWORDS: deposit, BCB, Kamajka

Crustacea (Decapoda, Cirripedia) from the Bohemian Cretaceous Basin

This thesis deals with systematic revision, evolutionary trends, palaeoecology and migration patterns of crustaceans (Cirripedia and Decapoda) from the Upper Cretaceous of the Bohemian Cretaceous Basin. Thesis is presented as a compilation of 9 papers that were published in scientific peer-reviewed journals and includes not only old museum material, but also numerous crustacean specimens which have been recovered in the last decade. Besides, short remarks on fossil crustaceans currently under study or in the process of being published (Paraclythia, Oncopareia, Acrothoracica) are also included in this thesis. In view of the fact that the fossil crustaceans from the BCB were most recently recorded in the turn of the 19th and the 20th centuries (and partially revised in the first half of the 20th century) and since the systematics and taxonomy have changed significantly, all papers presented here focus primarily on systematic revision and modern description. The essential part of the thesis thus deals with taphonomy and its bearing on the identification of fossil material. Thanks to a modern description, new species of Ctenocheles fritschi (axiidean shrimp), Archaeochionelasmus nekvasilovae (acorn barnacle), Myolepas reussi and Capitulum sklenari (pedunculate barnacles) were erected. C. fritschi is..

15th International Ichnofabric Workshop : program, abstracts, Field Guidebook

Radek Mikuláš convened the 15th International Ichnofabric Workshop to Prague (April 27th – May 5th, 2019). Thirty-two specialists from over the world presented recent contributions from the mainstream branch of ichnology, e.g., ichnofabrics of terrestrial systems. Special discussion block was devoted to the use of computed tomography in the study of Ichnofabric. Three days (five days for participants of the post-workshop excursion) for the workshop were devoted to field excursions. Thereby, most of the localities known only through publications have been seen and evaluated directly to the world top ichnologists

Taphonomy, distribution and palaeoecology of stalked barnacles (Crustacea, Cirripedia) from the Bohemian Cretaceous Basin, Czech Republic [abstract] /

Tyt. z nagłówka.Artykuł jest abstr. referatu z konferencji.Bibliogr. s. 98.The Cirripedia are marine crustaceans that as adults are usually sessile, attached to hard substrata or to other organisms by their first pair of antennas. The carapace completely envelops the body, and in most forms it secretes a calcareous shell, with an opening where they stretch out for food. Today cirripedes remain a highly successful group of crustaceans, both in number of species and abundance (Newman & Abbott 1980). The preferred habitats of modern Cirripedia are widely diverse, ranging from the uppermost littoral to abyssal depths. Being principally filter feeders in the intertidal food chain, they modify the habitat structure and affect the abundance and population structure of other intertidal organisms, and are vital to the ecological balance of the near-shore marine system (Chan 2007). However, most Late Mesozoic cirripede genera are extinct which means that, apart from associated faunal elements, there is little except overall capitular morphology that can be used to identify palaeoenvironmental conditions (Buckeridge 1983). Stalked barnacles most often occur in the fossil record as dissociated plates of capitulum and peduncle, because soon after death plates tend to disarticulate and become scattered, similar to modern lepadids and scalpellids (Hauschke et al. 2011). Whilst certain species of balanids are readily distinguishable from each other in the fossil record, others may easily be confused, especially when preserved as isolated plates. Species-level determination of fossil remains may commonly be achieved by the recognition of either some, or a combination of a few major features of single plates: conical or cylindrical plate, smooth or ribbed surface, shape of growth lines of inner and upper surface, position of apex, etc. (Collins et al. 2014). The barnacles form a predominant part of the arthropod assemblage throughoutthe Bohemian Cretaceous Basin (BCB) and are a common component of the mesofaunal fossil remains of the Upper Cretaceous pelagic and mainly nearshore-shallow marine deposits in the BCB. Barnacles from shallow water deposits possess relatively heavily calcified capitular plates (in comparison to pelagic forms) as an adaptation to high-energy environment. However, they could inhabit also microenvironments behind larger boulders, where the water current is not so turbulent. Although most of these cirripede shells involved rapidly break down into separate plates or valves after death, species of the Cretaceous genus Stramentum Logan provides some notable exceptions. Under certain conditions, individual plates of heavily calcified stramentids have remained articulated during fossilization and their occurrence appears to be restricted to three exceptional 2015, vol. 41 (1): 97–9898circumstances: when their cypris larvae attached directly to a substrate (e. g. ammonite shells); when cirripedes were embedded in black shales; or when cirripedes were rapidly buried. All Czech stramentids are known only as epizoans of the body chamber of smooth planispiral ammonites with widely spaced, shallow ribs, such as Collignoniceras Breistroffer and Lewesiceras Spath (Kočová Veselská et al. 2013). In addition, one articulated capitulum of Arcoscalpellum angustatum (Geinitz) is documented from the BCB; only a few reports of complete Arcoscalpellum are known from the Cretaceous deposits. The predation on cirripedes is also known from the BCB. The penetrative holes and non-pentrative pits of ichnogenus Sedilichnus Müller, caused by carnivorous naticid and muricid gastropods, are present on two capitular plates of Cretiscalpellum glabrum (Roemer). Microborings, which are more abundant on capitular cirripede plates from the BCB, are developed as small connected channels and could be caused by algae, hydroids, fungi or even clionid sponges. Similar data of predation on cirripede valves are poorly known, e. g. from the Campanian locality Ivö Klack in southern Sweden (Gale & Sørensen 2015).Dostępny również w formie drukowanej.KEYWORDS: conical plate, cylindrical plate, ribbed surface

Late Jurassic–Early Cretaceous stalked barnacles (Cirripedia, genus Eolepas Withers, 1928) from Štramberk, Moravia (Czech Republic)

Newly collected material of stalked barnacles, here assigned to the scalpelliform Eolepas, is recorded from Upper Jurassic (middle–upper Tithonian) and Lower Cretaceous (lower Berriasian–lower Hauterivian) limestones exposed at Kotouč quarry near Štramberk, Moravia, Czech Republic. The latter records constitute the first definite note of the genus from post-Jurassic strata. Seven carinae in the collections of the Národní Muzeum (Prague) are referred to the strambergensis morphotype, while three additional carinae and three terga show features typical of fimbriata. Because the original type of Brachylepas(?) fimbriatus has been lost, a neotype is designated here. We show that the holotype of Hamites(?) strambergensis Blaschke, 1911 refers to the same species that a later year was described by Withers (1912) as Brachylepas(?) tithonicus; it thus has priority. It is noted that differences between these two forms, as expressed in size and details of ornament, might turn out to be growth related, and that they could well be conspecific. On the basis of an XRD analysis, a carina is here shown to consist of francolite (calcium phosphate), a mineralogy typical of Eolepas. Relationships between the Moravian species and Late Jurassic congeners from England, Germany and France are briefly commented upon, as is the stratigraphy of cirripede occurrences at Kotouč Hill, with reference to the present material and previously recorded specimens.Web of Science275224723

New biostratigraphic evidence (calcareous nannofossils, ostracods, foraminifers, ammonites, inoceramids) on the Middle Coniacian in the eastern Bohemian Cretaceous Basin

The classical locality of Svinary in the eastern Bohemian Cretaceous Basin is the site of new biostratigraphic investigations. Besides some scarce macrofossil evidence, bulk sediment samples were processed to retrieve micropalaeontological assemblages, and calcareous nannofossil smear slides were analysed. The studied material provided calcareous nannofossil assemblages including Micula staurophora, Lithastrinus septenarius and Broinsonia parca expansa, thus documenting the Middle Coniacian (upper part of UC10 Zone and lower part of UC11 Zone). The foraminifera assemblage is relatively rich, planktonic species show a wide stratigraphical range, while the benthic association represented by Neoflabellina suturalis suturalis and Gaudryina carinata is very similar to the Coniacian biozone of Stensioeina granulata-Eponides whitei, valid for the Bohemian Cretaceous Basin. Ostracods are represented by two common cytherellid species, and two rare ornamented species: Imhotepia marssoni? and Pterygocythereis spinosa. Inoceramid bivalves, namely Platyceramus mantelli, and a newly recorded ammonite, Tridenticeras tridens, support the late Middle Coniacian age of the Svinary outcrop. New biostratigraphic results are given along with palaeoecological interpretations of newly collected fossil material