Results 21 to 30 of about 1,690 (206)
A new ‘acanthothoracid’ placoderm from the Arctic Canada (Early Devonian) and its bearing on the evolution of jaws and teeth [PDF]
Royal Society Open ScienceThe origin of jaws and teeth represents one of the most formative episodes in our own evolutionary history. However, this event is poorly understood because of a lack of detailed knowledge of key lineages, including the ‘acanthothoracid’ placoderms ...
Sébastien Olive +5 more
doaj +2 more sources
Confocal Characterization of Intestinal Dendritic Cells from Myxines to Teleosts [PDF]
Biology, 2022 Dendritic cells (DCs) are antigen-presenting cells (APCs) that regulate the beginning of adaptive immune responses. The mechanisms of tolerance to antigens moving through the digestive tract are known to be regulated by intestinal DCs.
Alessio Alesci +9 more
doaj +2 more sources
PLoS ONE, 2017 The taxonomy of Early Devonian placoderm material from the Lochkovian and Pragian of the Prague basin, previously attributed to the genera Radotina and Holopetalichthys, is revised.
Valéria Vaškaninová, Per E Ahlberg
doaj +2 more sources
Giant, swimming mouths: oral dimensions of extant sharks do not accurately predict body size in Dunkleosteus terrelli (Placodermi: Arthrodira) [PDF]
PeerJ, 2023 Background The size of Dunkleosteus and other late Devonian arthrodire placoderms has been a persistent problem in paleontology. The bony head and thoracic armor of these animals are typically the only elements preserved in the fossil record, with the ...
Russell Engelman
doaj +3 more sources
Devonian Antiarch Placoderms from Belgium Revisited
, 2013 Anatomical, systematic, and paleobiogeographical data on the Devonian antiarchs from Belgium are reviewed, updated and completed thanks to new data from the field and re-examination of paleontological collections.
S. Olive
semanticscholar +2 more sources
Acta Limnologica Brasiliensia, 2014 AIM: This study aimed to evaluate the influence of river-dam axis and abiotic factors on the composition of Closteriaceae, Gonatozygaceae, Mesotaeniaceae and Peniaceae in a tropical reservoir METHODS: Water samples for physical, chemical and periphyton ...
Sirlene Aparecida Felisberto +2 more
doaj +2 more sources
Evolution of the vertebrate neurocranium: problems of the premandibular domain and the origin of the trabecula [PDF]
Zoological Letters, 2018 The subdivision of the gnathostome neurocranium into an anterior neural crest-derived moiety and a posterior mesodermal moiety has attracted the interest of researchers for nearly two centuries.
Shigeru Kuratani, Per. E. Ahlberg
doaj +2 more sources
Bony-fish-like scales in a Silurian maxillate placoderm. [PDF]
Nat Commun, 2023 AbstractMajor groups of jawed vertebrates exhibit contrasting conditions of dermal plates and scales. But the transition between these conditions remains unclear due to rare information on taxa occupying key phylogenetic positions. The 425-million-year-old fishEntelognathuscombines an unusual mosaic of characters typically associated with jawed stem ...
Cui X, Friedman M, Yu Y, Zhu YA, Zhu M.
europepmc +4 more sources
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
Oligodendrogenesis in Evolution, Development and Adulthood. [PDF]
GliaMain Points Oligodendrocytes and myelin took shape in jawed vertebrates During development, OPCs are originated from NSCs and then undergo differentiation into mature oligodendrocytes that supply myelin. OPCs persist in the adult CNS and continue to produce oligodendrocytes and myelin.
Hu H, Gao T, Zhao J, Li H.
europepmc +2 more sources