Results 161 to 170 of about 2,860 (207)
Some of the next articles are maybe not open access.
Origin and Radiation of Chondrichthyans
2022This chapter looks at chondrichthyans, which are not primitive fishes, but are highly developed. The first definitive chondrichthyan fossils came from the Early Devonian period, although chondrichthyan-like scales are known to have existed from the early Silurian, and possibly the Ordovician periods.
F. Harvey Pough +3 more
openaire +1 more source
Chondrichthyan cytogenetics: A comparison with teleosteans
Journal of Molecular Evolution, 1991Cytogenetic studies on cartilaginous fish conducted in recent years have shown that these vertebrates have peculiarities associated both with the karyotypes and the size and composition of their DNAs. Although the data for this group, which includes about 1000 extant species, are still fragmentary, there appear to be more differences than similarities ...
STINGO, Vincenzo, ROCCO, Lucia
openaire +2 more sources
The biostratigraphy of Carboniferous chondrichthyans
Geological Society, London, Special Publications, 2021Abstract Among several groups of fishes existing in the Carboniferous, the Chondrichthyes appear to have the greatest stratigraphic potential. However, despite the long history of investigation into Paleozoic sharks, and especially their teeth, our knowledge of their usefulness in biostratigraphy and palaeoecology is still at an ...
openaire +2 more sources
Current Biology
Victoria Camilieri-Asch and colleagues introduce cartilage biology in chondrichthyans, the clade of fishes that includes sharks and rays.
Camilieri-Asch, Victoria +2 more
openaire +3 more sources
Victoria Camilieri-Asch and colleagues introduce cartilage biology in chondrichthyans, the clade of fishes that includes sharks and rays.
Camilieri-Asch, Victoria +2 more
openaire +3 more sources
Biogeographic patterns in the Australian chondrichthyan fauna
Journal of Fish Biology, 2011The major biogeographic structure and affinities of the Australian chondrichthyan fauna were investigated at both interregional and intraregional scales and comparisons made with adjacent bioregions. Faunal lists were compiled from six geographical regions with species from these regions assigned to distributional classes and broad
P R, Last, W T, White
openaire +2 more sources
Mineralized cartilage in the skeleton of chondrichthyan fishes
Zoology, 2006The cartilaginous endoskeleton of chondrichthyan fishes (sharks, rays, and chimaeras) exhibits complex arrangements and morphologies of calcified tissues that vary with age, species, feeding behavior, and location in the body. Understanding of the development, evolutionary history and function of these tissue types has been hampered by the lack of a ...
Mason N, Dean, Adam P, Summers
openaire +2 more sources
Is there a chondrichthyan bioaccumulation paradigm?
2006This paper is a synthesis of our current investigations to evaluate bioaccumulatory characteristics of chondrichthyans. The bioaccumulation of seven heavy metals and radionuclides (241Am, 109Cd, 57Co, 51Cr, 134Cs, 54Mn and 65Zn) from seawater were experimentally compared in the chondrichthyan Scyliorhinus canicula (spotted dogfish) and the ...
Jeffree, Ross A., Teyssie, Jean-Louis
openaire +1 more source
The Origin and Relationships of Early Chondrichthyans
2012Chondrichthyan shes are probably the most successful of all shes if success is measured in terms of historical endurance. Indeed, they have survived the mass extinctions of the last 400 million years or so. They are essentially dened by a cartilaginous skeleton that is supercially mineralized by prismatic calcications (tesserae) and by the ...
Eileen Grogan +2 more
openaire +2 more sources
Reproductive endocrinology in chondrichthyans: The present and the future
General and Comparative Endocrinology, 2013The class Chondrichthyes, that includes Elasmobranchii and Holocephali, is a diverse group of fish occupying a key position at the base of vertebrate evolution. Their evolutionary success is greatly attributed to their wide range of reproductive strategies controlled by different endocrine mechanics.
openaire +2 more sources
Chondrichthyan Evolution, Diversity, and Senses
2019Chondrichthyans are one of two major clades of living jawed vertebrates, with a rich fossil record potentially extending back to the Late Ordovician (455 million years ago, mya). The main groups of chondrichthyans include the chimaeroids, sharks, and skates and rays.
Boisvert, Catherine +3 more
openaire +2 more sources