Sentences with phrase «of early vertebrates»

«The scales of most fish that live today are very different from the ancient scales of early vertebrates,» says study author Dr Andrew Gillis from Cambridge's Department of Zoology and the Marine Biological Laboratory in Woods Hole.

Tail use improves soft substrate performance in models of early vertebrate land locomotors.

Zebrafish are one of the most promising models for the study of early vertebrate development and gene function.

Not exact matches

What do they know about the earliest vertebrate environment and some aspects of dermal skeletal tissue or the Opaque 2 function in maize?

In «Evolution of the Eye,» Trevor Lamb draws together multiple lines of evidence to create a persuasive narrative for the early evolution of the vertebrate eye.

Describing the find at a meeting of the Society for Vertebrate Paleontology in Pittsburgh, Pennsylvania, last month, Shimada speculated that the ancient tooth might have been washed downstream to Nebraska by floods, or carried as a ritual object by early humans.

It is obviously not possible to study the hearing of the early terrestrial vertebrates, which became extinct long ago.

A team of Danish researchers from Aarhus University, Aarhus University Hospital and the University of Southern Denmark therefore studied the hearing of lungfish and salamanders, which have an ear structure that is comparable to that of different kinds of early terrestrial vertebrates.

If the denticles of some very early vertebrate had migrated into the jaw, grown larger and gained new functions, the speculation went, they could have given rise to modern choppers.

The Daohugou Biota makes an immense contribution to our understanding of vertebrate evolution during this period, with such notable creatures as the oldest known gliding mammal, another early mammal that may have swum with a beaver - like tail, the oldest dinosaurs preserved with feathers, and a pterosaur that represents an important transitional form between two major groups.

So this is a timely book, and a fitting memorial to Everett C. Olson, one of the American coauthors, who contributed so much to the study of early land - going vertebrates.

Although it is one of the earliest known members this group, its thickened skull dome is surprisingly well - developed for its geological age,» said lead author Evans, ROM curator, vertebrate palaeontology.

protected animals» (i.e., bacteria, fungi, plants, invertebrate animals); studies on vertebrates at early stages of development (before they become?

Conodonts, tiny eel - like creatures that lived from 520 million to 205 million years ago and were our earliest vertebrate relatives, have long been one of paleontology's great enigmas.

A team led by Xing Xu at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing used computer software to examine evolutionary relationships among early birds and related dinosaurs, based on 374 skeletal characteristics.

With their proto - lungs and proto - limbs, lungfish represent the earliest stage in the evolution of air - breathing vertebrates.

Their findings suggest that even the earliest animals had the makings of both vertebrate and invertebrate visual systems, and that some of the photoreceptor cells in the invertebrate brain were transformed through a series of steps into vertebrate eyes.

As earliest jawed vertebrates grew, toothlike structures glommed onto the edge of a rugged plate

«Rainforest collapse 307 million years ago impacted the evolution of early land vertebrates.»

«Our embryological research helps us understand exactly how the gill structures in early vertebrates such as Metaspriggina relate to the gills of living forms,» says Gillis.

The belief in five digits as an ancestral character has even extended to fossil reconstructions of Ichthyostega, one of the earliest terrestrial vertebrates from the Devonian (about 390 to 340 million years ago).

«These findings demonstrate a single origin of gills that likely corresponds with a key stage in vertebrate evolution: when some of our earliest relatives transitioned from filtering particles out of water pumped through static bodies to actively swimming through the oceans,» says lead author Dr Andrew Gillis, a Royal Society University Research Fellow in Cambridge's Department of Zoology, and a Whitman Investigator at the Marine Biological Laboratory in Woods Hole, US.

«Deeper origin of gill evolution suggests «active lifestyle» link in early vertebrates.»

A tiny fossil from China could be the earliest of all deuterostomes, creatures that eventually led to evolution of all vertebrates, including humans

Finds such as the newly discovered Birgeria species and the fossils of other vertebrates now show that so - called apex predators (animals at the very top of the food chain) already lived early after the mass extinction.

The studies» analysis of sedimentary layers deposited with early terrestrial vertebrate fossils established that portions of our distant ancestors» environment dried out seasonally, but year - round much of it was, yep, a swamp.

Fossilised soft tissue from an extinct group of eel - like creatures, called conodonts, has yielded support for the idea that vertebrates existed 40 million years earlier than previously believed.

Dr Wenban - Smith explains the Ebbsfleet area would have been very different from today: «Rich fossilised remains surrounding the elephant skeleton, including pollen, snails and a wide variety of vertebrates, provide a remarkable record of the climate and environment the early humans inhabited.

I did field work in the Sangre de Cristo Mountains, and found ample evidence in the sediment — which contained early jawless fishes, some of the oldest fragments known — for signatures of freshwater deposits, [which suggest that the earliest vertebrates originated in freshwater streams and rivers].

A quarry in Strud, Belgium, that was excavated between 2004 and 2015 yielded fossils of multiple species of placoderms, which are extinct, armored fish that represent some of the earliest jawed vertebrates on Earth.

Lampreys may have gone parasitic early in the history of vertebrates and so have had a long time to evolve their vampiric specializations.

Early embryonic development of vertebrates is controlled by the genes and their «grammar.»

The last common ancestor of sharks and bony fishes probably didn't have gill arches arranged like those in modern sharks — which, in turn, suggests that the oldest known species of bony fishes can likely provide more information about the earliest jawed vertebrates (a group that today includes humans) than early chondrichthyans can, the researchers contend.

«In the case of placoderms like these, we're looking at some of the earliest jawed vertebrates,» Olive said.

In recent years, scientists have found that in vertebrates, including mammals, the earliest stages of segmentation are governed by a key set of genes, headed up by the so - called Notch gene.

In many vertebrates, ranging from fish to early synapsids (ancestors of mammals), denticles are commonly found in dense concentrations on the bones of the hard palate (roof of the mouth).

Before the dinosaurs, around 260 million years ago, a group of early mammal relatives called dicynodonts were the most abundant vertebrate land animals.

Philippe Janvier — Muséum National d'Histoire Naturelle, Paris, France Breaking through the mineral ceiling: Early fossil vertebrate anatomy in the light of new technologies

«There are few representatives of these early branches in vertebrate evolution that are still around today,» Coates said, which is why so much scientific attention has been paid to lampreys.

«We really need to think about the interactions of retroviruses and host immunity as the product of an ancient arms race stretching back to the early origins of vertebrates,» Katzaourakis said.

According to the study, published in the Journal of Vertebrate Paleontology on Tuesday, after the dinosaurs died out 66 million years ago, the Earth experienced an extremely warm period called the Early Eocene about 53 million to 50 million years ago, during which period, North American mammal communities were quite distinct from the ones that exist today.

Throughout his career, Jessell has focused on the early wiring of the vertebrate central nervous system.

Indeed, the BDV discussed earlier inserted some of its sequences into vertebrate genomes approximately 40 million years ago [56], and presence of these sequences correlates with disease resistance to BDV.

A new study from SciLifeLab / Uppsala University published in PLOS ONE shows that genes crucial for vision were multiplied in the early stages of vertebrate evolution and acquired distinct functions leading to the sophisticated mechanisms of vertebrate eyes.

The non-BMP body side will be dorsal (d) in vertebrate and ventral (v) in annelid, reflecting inversion of body posture in early chordate evolution (35).

By looking for cell populations that would resemble the vertebrate chordamesoderm (a population of mesodermal midline cells that converge medially to give rise to the notochord; red in Fig. 1A), we identified segmental pairs of mesodermal cells on the non — bone morphogenetic protein (BMP) body side (5) that stood out by early and continuous expression of colA1, encoding collagen type A (Fig. 2, A to D).

NEW YORK — The skull of a newly discovered 325 - million - year - old shark - like species suggests that early cartilaginous and bony fishes have more to tell us about the early evolution of jawed vertebrates — including humans — than do modern sharks, as was previously thought.

Like lampreys, they are considered to be «living fossils» similar to the early relatives of vertebrates that lived hundreds of millions of years ago.

Since the discovery of well - preserved fossils of an early Cretaceous sauropod dinosaur from Tanba in August 2006, our museum saff have been engaging themselves to excavation of dinosaur and other Cretaceous vertebrate fossils from this and adjacent regions, as well as academic studies on the resultant materials.

They report that the genes encoding the different subunits of PDE6 in cones and rods arose from ancestral genes that duplicated in the early vertebrate genome doublings, and further expanded in teleosts due to the extra genome duplication that took place in this lineage.