Article
Biology
Jorge Esteve, Matheo Lopez, Carlos-Guillermo Ramirez, Ivan Gomez
Summary: Colonization of the water column by animals occurred gradually during the early Palaeozoic. Trilobites are a good model to explore the colonization of marine ecosystems. CFD simulations show that Placopara was not able to swim, but its hydrodynamics allowed it to hop long distances.
JOURNAL OF THEORETICAL BIOLOGY
(2021)
Article
Geography, Physical
Jorge Esteve, Matheo Lopez-Pachon
Summary: Computational Fluid Dynamic simulations suggest that the Ordovician trilobite Microparia speciosa had a stable posture when enrolled, indicating its use as a hydrodynamic tool for stability in the water column. The trilobite likely used Metachronal propulsion for swimming and, in a high-viscosity environment, passive feeding strategy for energy saving.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Review
Virology
Zdenek Hubalek
Summary: This review traces the history of studies on endemic arboviruses and associated diseases in the Czech lands, focusing on a variety of viruses and providing a bibliography of relevant papers.
Article
Geosciences, Multidisciplinary
Valentin Bault, Diego Balseiro, Claude Monnet, Catherine Cronier
Summary: Trilobites were the most successful clade of marine invertebrates during the Cambrian, but their diversity declined after the end-Ordovician extinction event. This study investigates the evolutionary history and diversity dynamics of trilobites after the crisis, revealing different faunas and environmental influences.
EARTH-SCIENCE REVIEWS
(2022)
Article
Paleontology
Oldrich Fatka, Jakub Vodicka
Summary: The study suggests a distinction between Ordovician Krejciella and Cambrian Margaretia due to geographic distribution differences.
PALAEONTOLOGIA ELECTRONICA
(2022)
Article
Geosciences, Multidisciplinary
Oldrich Fatka, Petr Budil
Summary: Fossils from Cambrian to Devonian sediments in the Barrandian area of the Czech Republic have provided valuable insights into various invertebrate groups, including trilobites. Studies have revealed important information on trilobite eye construction, exoskeletal injury healing, and soft tissue morphology. Exceptionally well-preserved cephalic shields of Dalmanitina socialis from the Upper Ordovician Letna Formation demonstrate a high degree of variability in the distribution of FAIs, contributing to a better understanding of trilobite evolution in this region.
BULLETIN OF GEOSCIENCES
(2021)
Article
Paleontology
Maria Gabriela Suarez, Jorge Esteve
Summary: Morphological analysis of trilobite cephalic shape reveals patterns of diversity and disparity. Trilobites without interlocking devices exhibit more flexible head shapes, allowing for broader ecological niche occupancy, while lower disparity constrains adaptation ability. Increases in morpho-functional diversity and disparity coincide with early Paleozoic radiations and the Carboniferous-Permian biodiversification event.
Article
Biodiversity Conservation
Daniel Pauly, James D. Holmes
Summary: This study reexamines a length-frequency sample of the Ordovician trilobite Triarthrus eatoni. The results show that the growth of T. eatoni was asymptotic and slower compared to extant marine isopods.
Article
Paleontology
Jana Bruthansova, Jiri Bruthans, Heyo Van Iten, Stepan Rak, Jana Schweigstillova
Summary: This study describes five quartzose sandstone slabs containing Anaconularia anomala from the Letna Formation in the Prague Basin. The slabs contain adjacent conulariids and other fossils buried in a single bedding plane. The investigated conulariids show strong alignment and suggest burial by unidirectional currents. The growth pattern of the conulariids does not indicate clonal budding.
Article
Geography, Physical
Mark W. Hounslow, Samuel E. Harris, Krystian Wojcik, Jerzy Nawrocki, Kenneth T. Ratcliffe, Nigel H. Woodcock, Paul Montgomery
Summary: Magnetostratigraphic studies of the Ordovician provide evidence for the nature of core-mantle boundary interactions, and the new data contribute to a near-complete magnetic polarity chronostratigraphic scale through the Middle and Upper Ordovician. The magnetic signal is carried by both haematite and magnetite, with correlations between lithologies and local magnetic susceptibility, providing validation of a primary palaeomagnetic signal. The reversal frequencies for the mid and late Ordovician are estimated to be 1.7 and 1.5 Myr (-1) respectively.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Zdenka Nerudova, Petr Neruda, Petr Hamrozi
Summary: Moravia during the Late Upper Palaeolithic exhibited two different settlement strategies, possibly indicating the presence of different communities, seasonal changes in behavior of one community, or cultural evolution within a single community over time.
QUATERNARY INTERNATIONAL
(2021)
Article
Geology
Sandra Venclova, Oleksandra Chernomorets, Jiri Laurin, Jiri Kvacek, Jakub Sakala
Summary: This study presents the discovery of large fossil logs with Paraphyllanthoxylon wood from the Upper Cretaceous period in South Bohemia, Czech Republic, which are the largest recorded logs in the Eastern Hemisphere. The research clarifies the geological context and paleovegetation reconstruction of the area, highlighting the dominance of Paraphyllanthoxylon-type trees and the presence of platanoid and Normapolles complex plants. The unique changes in wood anatomy are likely associated with rare events, such as major floods.
CRETACEOUS RESEARCH
(2023)
Article
Entomology
Jerzy Dzik
Summary: A fossil larva resembling the trilobite protaspis was found in central Siberia, supporting the proximity of angarocaridids to trilobites. The presence of massive gnathobases in angarocaridids' cephalic appendages suggests they preyed on benthic shelly animals.
ARTHROPOD STRUCTURE & DEVELOPMENT
(2021)
Article
Environmental Sciences
Pavel Balvin, Adam Vizina, Magdalena Nesladkova, Johanna Blocher, Marcela Makovcova, Vojtech Moravec, Martin Hanel
Summary: The determination of minimum residual flow (MRF) in Europe varies due to different hydrological conditions, ecosystem requirements, water abstraction needs, and legislation. Despite the difficulty in qualitatively comparing methodologies among countries, individual approaches can serve as examples for developing new methodologies in legislative or environmental improvements. The Czech Republic has been working on MRF regulations for ten years, focusing on modern trends in ecological standards and utilizing standard hydrological characteristics for calculations. The new proposed approach is undergoing a complex approval process as it seeks to increase MRF levels compared to current methods.
Article
Geosciences, Multidisciplinary
Valentin Bault, Catherine Cronier, Arnaud Bignon
Summary: The study examines the effects of sea-level changes, anoxia, and tectonic events on Devonian trilobites. It finds that palaeogeographic and tectonic events played important roles in the distribution and diversity of trilobites during this time period. The research suggests that trilobites were scarce during the early Lochkovian time but diversified during the Pragian time. Tectonic movements and geographical barriers hindered trilobite migrations and led to a decrease in diversity during the Middle Devonian time. The study also reveals a recovery in trilobite diversity during the Famennian time.
GEOLOGICAL MAGAZINE
(2022)