Here we reconstruct a new tubular, serially divided organism with a bilateral morphology from the Ediacaran of South Australia. The organism, Plexus ricei n. gen. n. sp., was a broadly curving tube that resided on the Ediacaran seafloor. Plexus ricei individuals range in size from 5 to 80 cm long and 5 to 20 mm wide, and are comprised of two main c...
La frontière disciplinaire entre biologie et paléontologie est et a toujours été à la fois ténue et perméable. Si l’objet que toutes deux étudient est le même : le vivant, elles adoptent l’une et l’autre deux positions épistémiques différentes. C’est en l’occurrence l’archive biologique, le fossile, qui donne à la paléontologie son identité épistém...
Historical biogeography has a diversity of methods for inferring ancestral geographic ranges on phylogenies, but many of the methods have conflicting assumptions, and there is no common statistical framework by which to judge which models are preferable. Probabilistic modeling of geographic range evolution, pioneered by Ree and Smith (2008, Systema...
Here we reconstruct a new tubular, serially divided organism with a bilateral morphology from the Ediacaran of South Australia. The organism, Plexus ricei n. gen. n. sp., was a broadly curving tube that resided on the Ediacaran seafloor. Plexus ricei individuals range in size from 5 to 80 cm long and 5 to 20 mm wide, and are comprised of two main c...
Making precise measurements of clumped-isotopes in CO2 (reported as Δ47) is resource-intensive and time-consuming. Instrument and time-related variability of measured Δ47 values have hindered inter-laboratory calibration efforts. Additionally, clumped-isotopes measured in Paleozoic fossils suggest ancient marine temperatures and/or ocean isotopic c...
Making precise measurements of clumped-isotopes in CO2 (reported as Δ47) is resource-intensive and time-consuming. Instrument and time-related variability of measured Δ47 values have hindered inter-laboratory calibration efforts. Additionally, clumped-isotopes measured in Paleozoic fossils suggest ancient marine temperatures and/or ocean isotopic c...
Insect taphonomy is a topic that has drawn interest because of its potential biases on diversity and ecological information recorded by ancient insect faunas. To be preserved as a compression fossil, insects must be transported from their original habitat, break water surface tension and sink, and avoid degradation and predation while in the water ...
Insect taphonomy is a topic that has drawn interest because of its potential biases on diversity and ecological information recorded by ancient insect faunas. To be preserved as a compression fossil, insects must be transported from their original habitat, break water surface tension and sink, and avoid degradation and predation while in the water ...
Insect taphonomy is a topic that has drawn interest because of its potential biases on diversity and ecological information recorded by ancient insect faunas. To be preserved as a compression fossil, insects must be transported from their original habitat, break water surface tension and sink, and avoid degradation and predation while in the water ...
