Results 21 to 30 of about 643 (178)

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 Soc
ABSTRACT 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, Lopez M, Prince VE, Coates MI.   +3 more
europepmc   +2 more sources

Oligodendrogenesis in Evolution, Development and Adulthood. [PDF]

Glia
Main 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

Investigating the Morphogenesis and Replacement of Lamprey Toothlets Using Synchrotron Imaging. [PDF]

J Morphol
Toothlet replacement is a conserved feature in lampreys. We describe the mechanism at tissue level and quantify the determining factors, thus providing the basis for studies into a deep homology of cyclostome toothlets and gnathostome teeth. ABSTRACT Teeth are a key innovation that underpinned the adaptive radiation of jawed vertebrates; however, their
Grohganz M, Leyhr J, Johanson Z, Haitina T, Sanchez S, Dollman K, Stundl J, Bronner ME, Fraser GJ, Donoghue PCJ.   +9 more
europepmc   +2 more sources

Placoderm muscles and chordate interrelationships [PDF]

Biology Letters, 2007
[Trinajstic et al. (2007)][1] reported exceptionally preserved soft tissues in two placoderm fish from the Devonian of Australia. This exciting finding presents fresh morphological data with a bearing on an old phylogenetic problem: deep branching structure within the vertebrate tree.
Friedman, M, Brazeau, M, Brazeau, M
openaire   +3 more sources

A new selenosteid placoderm from the Late Devonian of the eastern Anti-Atlas (Morocco) with preserved body outline and its ecomorphology

Frontiers in Ecology and Evolution, 2022
Placoderms are an extinct group of early jawed vertebrates that play a key role in understanding the evolution of the gnathostome body plan, including the origin of novelties such as jaws, teeth, and pelvic fins.
Melina Jobbins, Martin Rücklin, Martin Rücklin, Humberto G. Ferrón, Humberto G. Ferrón, Christian Klug   +5 more
doaj   +1 more source

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, Z. Niu, Z. Xian, M. Zhu, M. Zhu, M. Zhu   +5 more
doaj   +1 more source

Cautionary tales on the use of proxies to estimate body size and form of extinct animals. [PDF]

Ecol Evol
Reconstructing the body size and form of extinct animals is of vital importance to our understanding of macroevolution and palaeontology. This is often done using anatomical proxies where extinct species are known only from fragmentary remains. However, there are many limitations influencing the selection of proxy taxa that are frequently overlooked ...
Gayford JH, Engelman RK, Sternes PC, Itano WM, Bazzi M, Collareta A, Salas-Gismondi R, Shimada K.   +7 more
europepmc   +2 more sources

Comment on "Exceptional preservation of organs in Devonian placoderms from the Gogo lagerstätte"

, 2023
Trinajstic et al., (Science, 16 September 2022, p. 1311-1314) describe exceptionally well-preserved organs in fossilized Devonian placoderms to infer the early evolution of the vertebrate heart.
Wang, Tobias, Møller, Peter Rask, Bjarke Jensen, José Manuel Icardo, Moorman, Antoon Fransiscus Maria, Tobias Wang, Icardo, José Manuel, Henrik Lauridsen, Jensen, Bjarke, Lauridsen, Henrik, Antoon Fransiscus Maria Moorman, Peter Rask Møller   +11 more
core   +1 more source

Endochondral bone in an Early Devonian ‘placoderm’ from Mongolia [PDF]

Nature Ecology & Evolution, 2020
Endochondral bone is the main internal skeletal tissue of nearly all osteichthyans—the group comprising more than 60,000 living species of bony fishes and tetrapods. Chondrichthyans (sharks and their kin) are the living sister group of osteichthyans and have cartilaginous endoskeletons, long considered the ancestral condition for all
Martin D. Brazeau, Sam Giles, Richard P. Dearden, Anna Jerve, Ya. Ariunchimeg, E. Zorig, Robert Sansom, Thomas Guillerme, Marco Castiello   +8 more
openaire   +7 more sources