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| http://dx.doi.org/10.1098/rsbl.2016.0159 | DOI Listing |
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Fossil evidence for a pharyngeal origin of the vertebrate pectoral girdle.
Nature
November 2023
The Natural History Museum, London, UK.
The origin of vertebrate paired appendages is one of the most investigated and debated examples of evolutionary novelty. Paired appendages are widely considered as key innovations that enabled new opportunities for controlled swimming and gill ventilation and were prerequisites for the eventual transition from water to land. The past 150 years of debate has been shaped by two contentious theories: the ventrolateral fin-fold hypothesis and the archipterygium hypothesis.
View Article and Find Full Text PDFThe oldest three-dimensionally preserved vertebrate neurocranium.
Nature
September 2023
School of Geography, Earth & Environmental Sciences, University of Birmingham, Birmingham, UK.
The neurocranium is an integral part of the vertebrate head, itself a major evolutionary innovation. However, its early history remains poorly understood, with great dissimilarity in form between the two living vertebrate groups: gnathostomes (jawed vertebrates) and cyclostomes (hagfishes and lampreys). The 100 Myr gap separating the Cambrian appearance of vertebrates from the earliest three-dimensionally preserved vertebrate neurocrania further obscures the origins of modern states.
View Article and Find Full Text PDFResponse to comment on "Exceptional preservation of organs in Devonian placoderms from the Gogo largerstätte".
Science
May 2023
Department of Organismal Biology, Evolutionary Biology Center, Uppsala University, Norbyvägen 18A, 75236 Uppsala, Sweden.
Jensen . () question evidence presented of a chambered heart within placoderms, citing its small size and apparently ventral atrium. However, they fail to note the belly-up orientation of the placoderm within one nodule, and the variability of heart morphology within extant taxa.
View Article and Find Full Text PDFThe Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications.
PLoS One
February 2023
Department of Organismal Biology, Uppsala University, Uppsala, Sweden.
Material of the antiarch placoderm Bothriolepis from the middle Givetian of the Valentia Slate Formation in Iveragh Peninsula, Ireland, is described and attributed to a new species, B. dairbhrensis sp. nov.
View Article and Find Full Text PDFThe oldest complete jawed vertebrates from the early Silurian of China.
Nature
September 2022
Key CAS Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences (CAS), Beijing, China.
Molecular studies suggest that the origin of jawed vertebrates was no later than the Late Ordovician period (around 450 million years ago (Ma)). Together with disarticulated micro-remains of putative chondrichthyans from the Ordovician and early Silurian period, these analyses suggest an evolutionary proliferation of jawed vertebrates before, and immediately after, the end-Ordovician mass extinction. However, until now, the earliest complete fossils of jawed fishes for which a detailed reconstruction of their morphology was possible came from late Silurian assemblages (about 425 Ma).
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