Results 51 to 60 of about 3,386 (197)

Trilobites [PDF]

open access: yes, 2020
Trilobites are marine arthropods that appeared in Cambrian Epoch 2 and became extinct at the end of the Permian. In some Paleozoic deposits, they number among the most abundant macrofossils.
Ahlberg, Per   +2 more
core  

Trilobites in early Cambrian tidal flats and the landward expansion of the Cambrian explosion [PDF]

open access: yes, 2014
The timing of the early invasion of the continents, the routes to the land, and the environmental breadth of the Cambrian explosion are important topics because they are at the core of our understanding of early evolutionary breakthroughs.
Buatois, Luis A.   +7 more
core   +1 more source

Abnormal trilobites from the Silurian and Devonian of Europe

open access: yesActa Palaeontologica Polonica
Malformed trilobites have been documented in deposits ranging from the Cambrian to the Permian. Continued examination of novel malformed specimens provides insight into how trilobites recovered from injuries, experienced genetic abnormalities, and ...
Russell D.C. Bicknell   +3 more
doaj   +1 more source

Trilobites from the Lejopyge laevigata Zone (Guzhangian; Upper Middle Cambrian) of the San Isidro Area, Mendoza, Argentina [PDF]

open access: yes, 2017
The San Isidro area is a classic fossil locality of the Lower Paleozoic of the southern Precordillera, Mendoza. The trilobites recognized to date from this area come from various stratigraphic levels of early middle Cambrian (Glossopleura and ...
Tortello, Marcelo Franco   +1 more
core   +1 more source

Why did the UV-A-induced photoluminescent blue–green glow in trilobite eyes and exoskeletons not cause problems for trilobites? [PDF]

open access: yesPeerJ, 2015
The calcitic lenses in the eyes of Palaeozoic trilobites are unique in the animal kingdom, although the use of calcite would have conveyed great advantages for vision in aquatic systems.
Brigitte Schoenemann   +2 more
doaj   +2 more sources

Trilobites del Pérmico inferior de Bolivia [PDF]

open access: yes, 1983
On décrit deux espèces nouvelles de trilobites du Permien bolivien, trouvées dans des sédiments du groupe Copacabana, dans les localités fossilifères de Yaurichambi et Yampupata (Copacabana), lors de la réalisation d’une étude biostratigraphique ...
Arellano, Jorge
core   +1 more source

Ancestral patterning of tergite formation in a centipede suggests derived mode of trunk segmentation in trilobites. [PDF]

open access: yesPLoS ONE, 2012
Trilobites have a rich and abundant fossil record, but little is known about the intrinsic mechanisms that orchestrate their body organization. To date, there is disagreement regarding the correspondence, or lack thereof, of the segmental units that ...
Javier Ortega-Hernández, Carlo Brena
doaj   +1 more source

Upper Cambrian trilobites from western Wyoming [PDF]

open access: yes, 1956
Upper Cambrian trilobites from western ...
C.R. Deland (10069969)   +1 more
core   +1 more source

Metacryphaeus rotundatus, um Novo Elemento da Fauna de Trilobites Calmoniidae (Phacopida), da Formação Ponta Grossa (Devoniano), Bacia do Paraná, Brasil [PDF]

open access: yesGeologia USP. Série Científica, 2008
Trilobites Calmoniidae (Delo, 1935) constituem o grupo de Phacopida mais abundante e diversificado do registro fóssilda Formação Ponta Grossa, Devoniano, Sub-bacia Apucarana.
Sabrina Pereira Soares   +2 more
doaj   +3 more sources

Palaeobiology of Silurian trilobites from North Greenland [PDF]

open access: yes, 2010
The Telychian (Llandovery, Silurian) reefs of North Greenland yield extensive collections of diverse and remarkably well preserved trilobites. The collections comprise 36 named trilobite species (32 new), and 30 under open nomenclature.
Hughes, Helen Elizabeth
core  

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