Results 31 to 40 of about 1,690 (206)
Investigating the Morphogenesis and Replacement of Lamprey Toothlets Using Synchrotron Imaging. [PDF]
J MorpholToothlet 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 +9 more
europepmc +2 more sources
Comment on “Exceptional preservation of organs in Devonian placoderms from the Gogo lagerstätte”
Science, 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.
Bjarke Jensen +5 more
semanticscholar +1 more source
Science, 2023 Jensen et al. (1) 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 ...
K. Trinajstic +12 more
semanticscholar +1 more source
Dataset of antiarch placoderms (the most basal jawed vertebrates) throughout Middle Paleozoic
, 2022 . Antiarch placoderms, the most basal jawed vertebrates, have the potential to enlighten the origin of the last common ancestor of jawed vertebrates. Quantitative study based on credible data is more convincing than qualitative study.
Zhaohui Pan +3 more
semanticscholar +1 more source
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
Cautionary tales on the use of proxies to estimate body size and form of extinct animals. [PDF]
Ecol EvolReconstructing 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 +7 more
europepmc +2 more sources
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 jawed vertebrates (
Martin D. Brazeau +8 more
openaire +8 more sources
A Middle-Late Devonian fish fauna from the Sierra de Perijá, western Venezuela, South America [PDF]
Fossil Record, 2002 A new Devonian fossil fish fauna from the region of Caño Colorado between the Rio Palmar and Rio Socuy, Sierra de Perijá, Venezuela, comes from two localities and several horizons within the Campo Chico Formation, dated on plants and spores as Givetian ...
G. C. Young, J. M. Moody
doaj +5 more sources
Electroporation‐based delivery of proteins in Penium margaritaceum and other zygnematophycean algae
Physiologia Plantarum, Volume 175, Issue 6, November/December 2023., 2023 Abstract Zygnematophycean algae represent the streptophyte group identified as the closest sister clade to land plants. Their phylogenetic position and growing genomic resources make these freshwater algae attractive models for evolutionary studies in the context of plant terrestrialization.
Vanessa Polet Carrillo‐Carrasco +2 more
wiley +1 more source
Известия высших учебных заведений: Геология и разведка, 2019 Three stages, namely Middle Devonian (I), Early Late Devonian (II) and Late Late Devonian (III), are distin-guished in the evolution of antiarchs (Placodermi, Antiarchi) in the Middle-Late Devonian of Northern Eurasia.
S. V. Moloshnikov
doaj +1 more source