Sentences with phrase «of tetrapod»

«When you look at the entirety of the Haramiyavia jaw and its primitive features, it's clear that this group sat at the very base of the mammalian family tree, much in the same way that Tiktaalik rosea sat at the base of the tetrapod tree.»

Using synchrotron X-rays a team from Uppsala University / SciLifeLab, the European Synchrotron Radiation Facility (ESRF) in France and the University of Cambridge in the UK decided have investigated fossils of the tetrapod Acanthostega, which lived 360 million ago.

In the pursuit of high - performance OPMs, the research team employed a strategy based on insights from the C2N structure to realize a uniformly microporous robust 3D - CON structure by the condensation of tetrapod - shaped THA and hexagon - shaped hexaketocyclohexane (HKH).

The forelimbs of tetrapod evolved from the pectoral fins of the ancestral fish.

Furthermore, they found that the catshark genome lacked a sequence found in mice and other tetrapods, which is responsible for preventing Gli3 expression in the posterior part of tetrapod limb buds.

But towards the end of this period a major global environment change took place — just as the number of tetrapod species began to increase, the rainforests started to disappear.

In late 2016, team members described five new species of tetrapod and identified fragmentary remains of at least seven more, all from the Romer's Gap era.

Gaining Ground The Origin and Evolution of Tetrapods.

By comparing the genomes of 203 vertebrates, they first traced the origin of KZFPs back to a common ancestor of tetrapods (four - legged animals) and coelacanth, a fish that evolved over 400 million years ago.

In 2016, team members described five new species of tetrapods from Romer's Gap, a span of millions of years nearly bereft of tetrapod discoveries.

Eusthenopteron (385 million years ago): Known from thousands of fossils, the lobe - finned fish's four meaty limbs have the same pattern of bones seen in the limbs of all tetrapods: a single bone nearest the body (your arm's humerus and your leg's femur), two bones farther out (your arm's radius and ulna and your leg's tibia and fibula).

Researchers at the University of Birmingham have discovered that the mass extinction seen in plant species caused by the onset of a drier climate 307 million years ago led to extinctions of some groups of tetrapods, the first vertebrates to live on land, but allowed others to expand across the globe.

«We have realised that, in similar palaeoenvironments, the associations of ichnites, and therefore of tetrapods, change.

They are actually true teeth, rather than just protrusions in the mouths of these tetrapods, says Reisz and his colleagues, Bryan Gee and Yara Haridy, both graduate students in paleontology.

However, in one group of tetrapods, temnospondyls (which are thought to be the ancestors of modern amphibians) these denticles were also found on small, bony plates that filled the large soft part of the palate.

The impact of the pull of the recent on the fossil record of tetrapods.

Malé is defended from storm surges by a wall of tetrapods.

This family of loaches, sometimes called sting - loaches, is found in Eurasia and Morocco and has about 28 genera with about 236 species (Berra The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe - finned fishes.

The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe - finned fishes.

Not exact matches

A few that pop to mind are the Coconino Sandstone, the meandering / lateral channels in the Grand Canyon, the progressive order of the fossil record (complete with a pre-hominid through hominid progression), forms which bear features bridging the specially - created kinds (i.e. fish with tetrapod features, reptiles with mammalian features, reptiles with avian features, etc), the presence of anomalous morphological / genetic features (e.g. the recurrent laryngeal nerve, male nip - ples, the presence of a defunct gene for egg - yolk production in our own placental mammal genomes), etc, etc..

Having arrived at the tetrapod stage he contrived to stay there without further reducing the versatility of his limbs.

Enamel — an almost pure layer of a mineral called hydroxyapatite — coats the teeth of almost all tetrapods (four - limbed creatures) and lobe - finned fish such as coelacanths.

The teeth were naked dentine, the same material that underlies the enamel in your teeth and those of most modern tetrapods.

The shoulders and pelvis of early tetrapods expanded and strengthened, allowing for load - bearing on land.

It also had the beginnings of a neck and a primitive wrist, as well as a middle ear — tetrapod traits not seen in fish.

«None of them are like tetrapods from later on.

TW: eed researchers focused on a handful of sites in Scotland, which was much closer to the equator and had a tropical climate when tetrapods were first coming ashore.

Some of the most exciting research on tetrapods has come from an interdisciplinary project based in the United Kingdom.

Fast forward to after the gap, and we see a diverse assortment of terrestrial tetrapods.

A 2012 reconstruction of early tetrapod Ichthyostega suggests that it couldn't bend side - to - side like lizards do as they walk.

Once ashore, these four - limbed vertebrates, called tetrapods, branched into an impressive range of animals: amphibians, reptiles, dinosaurs, birds and mammals.

«All of them are a little weird,» says Cambridge University professor emeritus Jennifer Clack, the grand dame of early tetrapod research.

On the far side of the gap, named after Alfred Romer, the Harvard University researcher who first noticed it, tetrapods are rare and ill - adapted for terrestrial living.

The tetrapods» move to land has long been one of the great evolutionary puzzles.

They basically had a lot of the main elements in place, and that enabled skates and tetrapods to evolve the walking behavior.»

While some invertebrates had transitioned from marine to terrestrial environments millions of years earlier, even more came ashore during this period, along with the tetrapods.

Through her discussion of when, where, and how vertebrates first came ashore, Clack offers an up - to - date account of our understanding of the fish to tetrapod transition, one of the classic evolutionary stories.

A group of scientists believed the fossilized imprints in this slab were made by a tetrapod.

A European team of researchers headed by the University of Zurich and the Technical University Berlin has now studied the shape of the ribcage in more than 120 tetrapods — from prehistoric times up to the present day.

In the course of evolution, tetrapods developed various body shapes and sizes — from the mouse to the dinosaur — to adapt to different environments.

The same sites have also produced some of the earliest post-Devonian tetrapods, four - limbed creatures that included some of humanity's earliest relatives, filling a post-extinction lull in their diversity known as Romer's Gap.

An early tetrapod is shown at the top of the image.

«The high regenerative capacities were lost in the evolutionary history of the different tetrapod lineages, at least once, but likely multiple times independently, among them also the lineage leading to mammals.»

The findings indicate that these stages of ear evolution were set 10 million years before tetrapods appeared, the team reports 19 January in Nature.

«Based on the phylogenetic relationships and the presence of tetrachromacy in recent tetrapods it is most likely that the stem species - of all terrestrial vertebrates had photo receptors to detect blue, green, red and uv,» says Dr. Christian Fischer of the University of Göttingen.

These two palaeoenvironments would have been inhabited by groups of different tetrapods during the Permian Period.

Emma Dunne, from the University of Birmingham's School of Geography, Earth and Environmental Sciences, said: «This is the most comprehensive survey ever undertaken on early tetrapod evolution, and uses many newly developed techniques for estimating diversity patterns of species from fossil records, allowing us greater insights into how early tetrapods responded to the changes in their environment.»

The team compared the fish's bones and head structure to fossils of a more primitive fish and an early tetrapod.

The results of the study show that tetrapod diversity decreased after the rainforest collapse and the onset of drier conditions, largely due to the reduction in suitable habitats for amphibians which needed wet environments to survive.

The researchers analyzed a skull of Panderichthys — an ancient fish that evolved at about the same time as tetrapods (early four - legged land - dwellers) from a common ancestor.