Polyatomic trilobite Rydberg molecules in a dense random gas [PDF]
, 2004 Trilobites are exotic giant dimers with enormous dipole moments. They consist of a Rydberg atom and a distant ground-state atom bound together by short-range electron-neutral attraction. We show that highly polar, polyatomic trilobite states unexpectedly
Luukko, Perttu J. J., Rost, Jan-Michael
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The oldest known digestive system consisting of both paired digestive glands and a crop from exceptionally preserved trilobites of the Guanshan Biota (Early Cambrian, China). [PDF]
PLoS ONE, 2017 The early Cambrian Guanshan biota of eastern Yunnan, China, contains exceptionally preserved animals and algae. Most diverse and abundant are the arthropods, of which there are at least 11 species of trilobites represented by numerous specimens.
Melanie J Hopkins +3 more
doaj +1 more source
Scientific Reports, 2021 Episodic low oxygenated conditions on the sea-floor are likely responsible for exceptional preservation of animal remains in the upper Amouslek Formation (lower Cambrian, Stage 3) on the northern slope of the western Anti-Atlas, Morocco.
Gerd Geyer, Ed Landing
doaj +1 more source
Comparing the Development and Viability of Horseshoe Crab Eggs Laid in Beach and Salt Marsh Habitats. [PDF]
Ecol EvolRecent research has found that horseshoe crabs spawn regularly in salt marshes. However, it remained unclear if eggs laid in salt marsh sediments are viable. In this study, we show that eggs laid in salt marsh habitats develop similarly to those laid in beach habitats, suggesting that salt marshes are viable spawning habitats for horseshoe crabs ...
Sasson DA +6 more
europepmc +2 more sources
Discovery of trilobite trace fossils from the Early to Middle Cambrian, Tabas Block, Central Iran [PDF]
Journal of Stratigraphy and Sedimentology Researches, 2017 Early to Middle Cambrian successions exposed at the Shirgesht area, Tabas Block of central Iran has yielded a high diversity and abundant ichnofossils with arthropod trackways. These trace fossils contain diverse ethological patterns, including furrowing
ئارام بایت گل +2 more
doaj +1 more source
Polyatomic Molecules Formed with a Rydberg Atom in an Ultracold Environment [PDF]
, 2006 We investigate properties of ultralong-range polyatomic molecules formed with a Rb Rydberg atom and several ground-state atoms whose distance from the Rydberg atom is of the order of n^2a_0, where n is the principle quantum number of the Rydberg electron.
Boisseau +18 more
core +1 more source
Coupled exuviae of the Ordovician Ovalocephalus (Pliomeridae, Trilobita) in South China and its behavioral implications [PDF]
PeerJ, 2020 Ecdysis was a vital process during the lives of trilobites. In addition to preserving the morphological changes in trilobite ontogeny, the preservation of its action often captured interesting behavioral information.
Ruiwen Zong
doaj +2 more sources
Ontogenetic moulting behavior of the Cambrian oryctocephalid trilobite Arthricocephalites xinzhaiheensis [PDF]
PeerJ, 2021 Moulting behaviors in trilobites are a crucial strategy during development. Previous studies have demonstrated inter-and intraspecific variability of moulting behavior in trilobites.
Yifan Wang +8 more
doaj +2 more sources
Exploring abnormal Cambrian-aged trilobites in the Smithsonian collection [PDF]
PeerJ, 2020 Biomineralised trilobite exoskeletons provide a 250 million year record of abnormalities in one of the most diverse arthropod groups in history. One type of abnormality—repaired injuries—have allowed palaeobiologists to document records of Paleozoic ...
Russell D.C. Bicknell, Stephen Pates
doaj +2 more sources
Trilobite ‘pelotons’: possible hydrodynamic drag effects between leading and following trilobites in trilobite queues [PDF]
Palaeontology, 2017 AbstractEnergy saving mechanisms in nature allow following organisms to expend less energy than leaders. Queues, or ordered rows of individuals, may form when organisms exploit the available energy saving mechanism while travelling at near‐maximal sustainable metabolic capacities; compact clusters form when group members travel well below maximal ...
Hugh Trenchard +2 more
openaire +2 more sources