Results 11 to 20 of about 205 (136)
A persistent influence of supernovae on biodiversity over the Phanerozoic. [PDF]
Ecol Evol, 2023 It shows the correlation between diversity and supernovae frequency. Abstract It is an open question what has constrained macroevolutionary changes in marine animal diversity on the time scale of the Phanerozoic. Here, we will show that supernovae appear to have significantly influenced the biodiversity of life.
Svensmark H.
europepmc +2 more sources
Modularity in the trilobite head consistent with the hypothesized segmental origin of the eyes. [PDF]
Evol Dev, 2022 The degree and structure of modularity in the heads of two trilobite species, Calyptaulax annulata (left) and Cloacaspis senilis (right) are identified. Best fit hypotheses of modularity are consistent for both species: the eyes and anterior head highly covary (red), consistent with the anteriormost ocular segment of early arthropods.
Vargas-Parra EE, Hopkins MJ.
europepmc +2 more sources
Developmental traits and life strategy of redlichiid trilobites. [PDF]
Biol 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
Floian, Early Ordovician, trilobites from the Olongbluk Terrane, northwest China [PDF]
Acta Palaeontologica Polonica, 2023 Floian, Early Ordovician trilobites are systematically described and revised based on new material from the middle part of the Duoquanshan Formation of the Shihuigou area, northern Qinghai Province, northwest China.
XIN WEI, ZHIQIANG ZHOU
doaj +1 more source
A new middle Cambrian trilobite with a specialized cephalon from Shandong Province, North China [PDF]
Acta Palaeontologica Polonica, 2020 Trilobites achieved their maximum generic diversity in the Cambrian, but the peak of morphological disparity of their cranidia occurred in the Middle to Late Ordovician. Early to middle Cambrian trilobites with a specialized cephalon are rare, especially
Zhixin Sun, Han Zeng, Fangchen Zhao
doaj +1 more source
Conodonta, Trilobita, and Anthozoa near the Late Frasnian Upper Kellwasser Event of the Geipel Quarry section in Schleiz, Thuringian Mountains (Germany) [PDF]
Fossil Record, 2003 New recoveries of Trilobita, Anthozoa and Conodonta from the linguiformis Zone close to the Frasnian/Famennian boundary and Immediately preceding the Upper Kellwasser Event level at Schleiz (Thuringia) are investigated.
D. Weyer, R. Feist, C. Girard
doaj +5 more sources
Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting
Papers in Palaeontology, Volume 9, Issue 5, September/October 2023., 2023 Abstract Tuff‐bearing upper Cambrian to lowermost Ordovician strata on Ko Tarutao island, Satun province, southernmost peninsular Thailand, contain a rich trilobite fauna relevant to global biostratigraphy, peri‐Gondwanan palaeogeography and shifting evolutionary mode.
Shelly J. Wernette +3 more
wiley +1 more source
Rise and fall of the phacopids: the morphological history of a successful trilobite family
Palaeontology, Volume 66, Issue 5, September/October 2023., 2023 Abstract Phacopidae were a successful family of the Silurian–Devonian period. Although their diversity trends are well identified, their shape evolution is unknown; their morphology often considered to be conservative. We have quantified these morphologies using geometric morphometrics (landmarks) and investigated their evolution using morphological ...
Valentin Bault +7 more
wiley +1 more source
Papers in Palaeontology, Volume 9, Issue 3, May/June 2023., 2023 Abstract Artiopoda was a diverse group of Palaeozoic euarthropods that proliferated in the early Palaeozoic, epitomized by the ubiquitous trilobites. Their possible phylogenetic position outside mandibulates and chelicerates offers the potential for understanding the evolution of euarthropods in more detail.
Harry O. Berks +5 more
wiley +1 more source
Palaeontology, Volume 66, Issue 3, May/June 2023., 2023 Abstract Trilobites were notably flexible in the moulting behaviours they employed, producing a variety of moult configurations preserved in the fossil record. Investigations seeking to explain this moulting variability and its potential impacts are few, despite abundant material being available for study.
Harriet B. Drage +3 more
wiley +1 more source