Results 11 to 20 of about 104 (62)

Developmental traits and life strategy of redlichiid trilobites. [PDF]

open access: yesBiol Rev Camb Philos Soc, 2023
ABSTRACT The developmental mode of four redlichiid trilobites is summarized, based upon exceptionally well‐preserved, articulated specimens from Cambrian Series 2 (stages 3 and 4) strata in southwestern China and South Australia. These relatively complete developmental sequences indicate a balanced rate in segment increase and addition to the thorax ...
Dai T, Zhang X, Peng S.
europepmc   +2 more sources

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

open access: yesPalaeontology, 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

open access: yesPapers 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   +4 more
wiley   +1 more source

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

open access: yesPalaeontology, 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   +2 more
wiley   +1 more source

New information on olenelline trilobites from the Early Cambrian Sekwi Formation, Northwestern Canada [PDF]

open access: yes, 2010
This is the author's accepted manuscript, the published version is available at http://www.nrcresearchpress.com/doi/abs/10.1139/E10-073#.U21JO4FdXUL .A new species of olenelline trilobite, Nevadella keelensis, is described from the Early Cambrian ...
Abe, Francine Reiko   +3 more
core   +1 more source

The distribution of Paradoxides (Acadoparadoxzdes) mureroensis SDZUY, 1958 (earliest Middle Cambrian) and its palaeobiogeographical consequences [PDF]

open access: yes, 1993
[Resumen] El norte de España contiene los mejores afloramientos conocidos para estudiar la transición del Cámbrico Inferior al Cámbrico Medio en la región mediterránea debido, sobre todo, al excelente registro paleontológico presente en la Región ...
Gozalo, R.   +4 more
core   +1 more source

New Information about the Internal Anatomy and Taphonomic History of Trilobites Revealed through CT Scanning [PDF]

open access: yes, 2015
X-ray computed tomography (CT or XCT) scans were made of eight trilobite species hypothesized to have internal remains preserved through early diagenetic processes. Specimens range in age from Cambrian Epoch 3 to Late Ordovician.
Rutana, Michael
core  

Revisión sistemática y bioestratigrafía del género Alueva Sdzuy, 1961 (Ellipsocephalidae, Trilobita, Cámbrico). [PDF]

open access: yes, 2013
Se revisa la sistemática del género Alueva Sdzuy, 1961 y de las tres especies incluidas en él: Alueva undulata Sdzuy, 1961, Alanisia hastata Sdzuy, 1958, y Strenuaeva sampelayoi moratrix Sdzuy, 1958, todas ellas definidas en la localidad zaragozana de ...
Dies Álvarez, M. E.   +2 more
core   +1 more source

A revision of Devonian trilobites from Belgium - Part 1 The Genera Cornuproetus and Radiaspis [PDF]

open access: yes, 2005
Belgian Devonian trilobites have long been known, although they remain comparatively poorly documented. A revision of the obsolete nomenclature seems long overdue, and added to that, critical evaluations of listings of trilobite taxa by MAILLIEUX over ...
Magrean, B., Van Viersen, A.P.
core  

Revision of some Devonian trilobites from BelgiumThe genera Astycoryphe, Tropidocoryphe, Eifliarges and Koneprusia [PDF]

open access: yes, 2006
Belgian Devonian trilobites have long been known, but remain comparatively poorly documented. A revision of the obsolete nomenclature seems long overdue, and additionally, a critical evaluation of listings of trilobite taxa by MAILLIEUX (1946) made over ...
Magraen, B.
core  

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