Results 11 to 20 of about 22 (21)

Contrasting patterns of disparity suggest differing constraints on the evolution of trilobite cephalic structures during the Cambrian ‘explosion’

Palaeontology, Volume 66, Issue 2, March/April 2023., 2023
Abstract Trilobites are an abundant group of Palaeozoic marine euarthropods that appear abruptly in the fossil record c. 521 million years ago. Quantifying the development of morphological variation (or ‘disparity’) through time in fossil groups like trilobites is critical in understanding evolutionary radiations such as the Cambrian ‘explosion’. Here,
James D. Holmes, Javier Álvaro
wiley   +1 more source

Biostratigraphy and taxonomy of Drumian (middle Cambrian) agnostid trilobites of the Manuels River Formation, Avalonian Newfoundland, Canada

Papers in Palaeontology, Volume 7, Issue 3, Page 1657-1698, August 2021., 2021
Abstract New, accurately located and well‐preserved agnostid trilobite material has been collected from the type locality of the Drumian (middle Cambrian, Miaolingian) Manuels River Formation, Newfoundland, Canada. The well‐exposed grey to black shales containing the fauna were deposited on the former microcontinent Avalonia.
Anne Hildenbrand, Gregor Austermann, Christina Ifrim, Peter Bengtson, Javier Álvaro   +4 more
wiley   +1 more source

Phylogenetic response of naraoiid arthropods to early–middle Cambrian environmental change

Palaeontology, Volume 64, Issue 1, Page 161-177, January 2021., 2021
Abstract The Cambrian Period, primarily known for animal life diversifying, experienced global extinctions. Pulses of extinction in Cambrian Series 2 are exemplified by the disappearance of archaeocyath sponges and olenelline and redlichiid trilobites.
Andrew D. Bond, Gregory D. Edgecombe, Xi‐Guang Zhang   +2 more
wiley   +1 more source

Ontogeny of the trilobite Redlichia from the lower Cambrian (Series 2, Stage 4) Ramsay Limestone of South Australia

, 2022
Studies that reveal detailed information about trilobite growth, particularly early developmental stages, are crucial for improving our understanding of the phylogenetic relationships within this iconic group of fossil arthropods.
Holmes, James D, Paterson, John R, Jago, James B, García-Bellido, Diego C   +3 more
core   +1 more source

The fossil record of ecdysis, and trends in the moulting behaviour of trilobites [PDF]

, 2015
Ecdysis, the process of moulting an exoskeleton, is one of the key characters uniting arthropods, nematodes and a number of smaller phyla into Ecdysozoa.
Drage, Harriet, Drage, HB, Daley, Allison, Daley, AC   +3 more
core   +2 more sources

The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae

, 2015
Laibl, L., Fatka, O., Budil, P., Ahlberg, P., Szabad, M., Voka, V. & Kozak, V., 24.3.2015. The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae. Alcheringa 39, 477-487.
Ahlberg, Per, Vladislav Kozák, Kozak, Vladislav, Budil, Petr, Per Ahlberg, Lukáš Laibl, Laibl, Lukas, Oldřich Fatka, Fatka, Oldrich, Ahlberg, Per,, Szabad, Michal, Petr Budil, Michal Szabad, Václav Vokáč, Vokac, Vaclav, Lund University.   +15 more
core   +1 more source

Appendages of an early Cambrian metadoxidid trilobite from Yunnan, SW China support mandibulate affinities of trilobites and artiopods

, 2017
Appendage anatomy contributes crucial data for understanding the evolution and ecology of Euarthropoda. The Palaeozoic trilobites show a great diversity of exoskeletons in the fossil record.
ZONGJUN YIN, FANGCHEN ZHAO, MAOYAN ZHU, HAN ZENG   +3 more
core   +1 more source

Biostratigraphie et taxonomie des trilobites polymères de la formation de Manuels River (Drumien, Cambrien moyen), Terre-Neuve, Canada

, 2022
La formation cambrienne moyenne de Manuels River est renommée pour sa faune de trilobites bien préservés. Nous présentons ici un assemblage nouvellement collecté de 1184 spécimens provenant de la localité type de Conception Bay South, Terre-Neuve, Canada.
AUSTERMANN Gregor

Auteur

AUSTERMANN
core  

Phylogenetic history of major trilobite clades in relation to paleoenvironment

, 1992
Because trilobites occupied a wide a range of Paleozoic marine habitats they are a good group to examine hypotheses concerning the sites in which new major clades first appear, and their subsequent history of diversification and decline.
Richard A. Fortey, Robert M. Owen
core   +1 more source

Los trilobites del Cámbrico y Ordovícico en el estado de Sonora, México: su diversidad sistemática, su status en el contexto mundial y sus implicaciones paleogeográficas [PDF]

, 2010
En el estado de Sonora, ubicado en la región noroeste de México, están expuestas secuencias sedimentarias cuya edad varía desde el Proterozoico tardío hasta el Reciente.
Almazán Vázquez, E., Vachard, Daniel, Buitrón Sánchez, Blanca Estela   +2 more
core