New information on Brindabellaspis stensioi Young, 1980, highlights morphological disparity in Early Devonian placoderms [PDF]
Royal Society Open Science, 2018 Acid-prepared specimens of the placoderm Brindabellaspis stensioi (Early Devonian of New South Wales, Australia) revealed placoderm endocranial anatomy in unprecedented detail.
Benedict King +2 more
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A well-preserved ‘placoderm’ (stem-group Gnathostomata) upper jaw from the Early Devonian of Mongolia clarifies jaw evolution [PDF]
Royal Society Open Science, 2023 The origin of jaws and teeth remains contentious in vertebrate evolution. ‘Placoderms’ (Silurian-Devonian armoured jawed fishes) are central to debates on the origins of these anatomical structures.
Martin D. Brazeau +7 more
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Squamation and scale morphology at the root of jawed vertebrates [PDF]
eLife, 2022 Placoderms, as the earliest branching jawed vertebrates, are crucial to understanding how the characters of crown gnathostomes comprising Chondrichthyes and Osteichthyes evolved from their stem relatives.
Yajing Wang, Min Zhu
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A Bayesian approach to dynamic homology of morphological characters and the ancestral phenotype of jawed vertebrates [PDF]
eLife, 2020 Phylogenetic analysis of morphological data proceeds from a fixed set of primary homology statements, the character-by-taxon matrix. However, there are cases where multiple conflicting homology statements can be justified from comparative anatomy.
Benedict King, Martin Rücklin
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Biomechanical analyses of pterygotid sea scorpion chelicerae uncover predatory specialisation within eurypterids [PDF]
PeerJ, 2022 Eurypterids (sea scorpions) are extinct aquatic chelicerates. Within this group, members of Pterygotidae represent some of the largest known marine arthropods.
Russell D. C. Bicknell +5 more
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Re-make, re-model: evolution and development of vertebrate cranial lateral lines. [PDF]
Biol Rev Camb Philos SocABSTRACT Lateral lines are placodally derived mechanosensory systems on the heads and trunks of many aquatic vertebrates. There is evidence of lateral lines in the earliest known vertebrate fossils, and they exist in organisms with widely different craniofacial morphologies – including the presence or absence of jaws, external or internal nostrils, and
Venkataraman V +3 more
europepmc +2 more sources
A large Middle Devonian eubrachythoracid ‘placoderm’ (Arthrodira) jaw from northern Gondwana [PDF]
Swiss Journal of Palaeontology, 2021 For the understanding of the evolution of jawed vertebrates and jaws and teeth, ‘placoderms’ are crucial as they exhibit an impressive morphological disparity associated with the early stages of this process.
Melina Jobbins +3 more
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Extreme lower jaw elongation in a placoderm reflects high disparity and modularity in early vertebrate evolution [PDF]
Royal Society Open ScienceJaws are a key vertebrate feature that arose early in our evolution. Placoderms are among the first jawed vertebrates; their fossils yield essential knowledge about the early diversification of gnathostome feeding strategies, diets and modularity ...
Melina Jobbins +6 more
doaj +2 more sources
Reappraisal of the Silurian placoderm Silurolepis and insights into the dermal neck joint evolution [PDF]
Royal Society Open Science, 2019 Silurolepis platydorsalis, a Silurian jawed vertebrate originally identified as an antiarch, is here redescribed as a maxillate placoderm close to Qilinyu and is anteroposteriorly reversed as opposed to the original description.
You-an Zhu, Jing Lu, Min Zhu
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A novel specimen-based mid-Paleozoic dataset of antiarch placoderms (the most basal jawed vertebrates) [PDF]
Earth System Science Data, 2023 Antiarcha data are essential to quantitative studies of basal jawed vertebrates. The absence of structured data on key groups of early vertebrates, such as Antiarcha, has lagged in understanding their diversity and distribution patterns.
Z. Pan +5 more
doaj +3 more sources