Results 11 to 20 of about 809 (126)
Multiple origins of dorsal ecdysial sutures in trilobites and their relatives [PDF]
eLifeEuarthropods are an extremely diverse phylum in the modern, and have been since their origination in the early Palaeozoic. They grow through moulting the exoskeleton (ecdysis) facilitated by breaking along lines of weakness (sutures).
Kun-sheng Du +5 more
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An Increase in Animal Diversity was Facilitated by Ecologically‐Driven Brain Complexity Throughout the Cambrian [PDF]
BioEssays, Volume 48, Issue 4, April 2026.The Brain‐First Hypothesis suggests that the Cambrian transition from animals with simple body plans and simple brains to more complex animals was driven by a selection for brains with increased neural processing, following increased ecological complexity, and the networks underlying brain development were co‐opted to pattern other complex systems ...
Ariel D. Chipman
wiley +2 more sources
A new bilaterally injured trilobite presents insight into attack patterns of Cambrian predators [PDF]
PeerJ, 2022 Durophagous predation in the Cambrian is typically recorded as malformed shells and trilobites, with rarer evidence in the form of coprolites and shelly gut contents.
Ruiwen Zong, Russell D.C. Bicknell
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The median eyes of trilobites [PDF]
Scientific Reports, 2023 Arthropods typically possess two types of eyes—compound eyes, and the ocellar, so called 'median eyes'. Only trilobites, an important group of arthropods during the Palaeozoic, seem not to possess median eyes.
Brigitte Schoenemann +1 more
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Allopatric molting of Devonian trilobites [PDF]
Scientific Reports, 2022 Trilobite exuviae record the development of individual trilobites and their molting process and can also contain information on their behavior. The silt- to fine-grained tuffites of the middle part of the Middle Member of the Upper Devonian Hongguleleng ...
Ruiwen Zong, Yiming Gong
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Reassessing a cryptic history of early trilobite evolution [PDF]
Communications Biology, 2022 A reassessment of early trilobite phylogenetic relationships and palaeobiogeographic patterns suggests that a cryptic evolutionary history is unlikely for this group.
James D. Holmes, Graham E. Budd
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Advances in the Lower Ordovician of the western Iberian Chain, NE Spain [PDF]
Estonian Journal of Earth Sciences, 2023 The western Iberian Chain of NE Spain represents a lateral prolongation of the West Asturian-Leonese Zone. As other proximal sectors fringing NW Gondwana, the chain comprises a conÂformable and continuous FurongianâTremadocian transition, comprising a
J. Javier Álvaro +1 more
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On the lower boundary of the Floian Stage in Estonia [PDF]
Estonian Journal of Earth Sciences, 2012 The lower boundary of the Second Stage of the Lower Ordovician Series, the Floian Stage, is defined by the first appearance of the graptolite Tetragraptus approximatus.
Helje Pärnaste, Viive Viira
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Communications Earth & Environment, 2023 Trilobites with appendages from the Rust Formation of New York State were discovered in the 1870s and represent one of the earliest known cases of exceptional preservation of non-biomineralized tissues.
Sarah R. Losso +2 more
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Frontiers in Ecology and Evolution, 2023 Trilobites inhabited all environments of Paleozoic seas, ranging from estuaries to continental slopes, and were globally distributed. Although their functional morphology and phylogenetic relations are established by well-preserved body fossils, the ...
Daniel Sedorko +11 more
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