Sentences with phrase «many vertebrate groups»

Cavanilles Institute of Biodiversity and Evolutionary Biology, Terrestrial Vertebrates Group, University of Valencia, E-46980 Paterna, Valencia, Spain.

Of the ray - finned fish, the so - called Neopterygii («new fins») became particular biodiverse during the Triassic and, with over 30,000 species, today constitute the largest vertebrate group.

This fossil assemblage, newly named the Daohugou Biota after a village near one of the major localities in Inner Mongolia, China, dates from a time when many important vertebrate groups, including our own group, mammals, were undergoing evolutionary diversification.

The scientists studied the rib plates, so - calledcostals, of turtle shells and the ribs of various fossil and living vertebrate groups, including mammals, crocodiles and even dinosaurs.

For each major vertebrate group, ancient and modern (and with no particular emphasis on ours), Bonnan examines the skeleton to see how structure relates to function using plain analogies: basic body plan is likened to a car chassis, jaws to scissors or nutcrackers, eyes to camera lenses.

«As we found here, those developmental processes are still used to build the skeletons of many vertebrate groups, including humans.»

However, with approximately 58 percent of the world's 335 turtle species threatened with extinction, turtles are the most endangered vertebrate group in the world.

Professor Griffin explained: «Bird genomes are distinctive in that they have more tiny microchromosomes than any other vertebrate group.

Triassic dinosaurs couldn't displace the more abundant vertebrate groups — the rhynchosaurs and cynodonts — that dominated their world.

«On the one hand, there was this idea that the third eye was simply reduced independently in many different vertebrate groups such as mammals and birds and is retained only in lizards among fully land - dwelling vertebrates,» says Krister Smith at the Senckenberg Research Institute in Germany.

This begins to explain the ancestral origins of the neural basis for the close coupling between vocal and pectoral / gestural signalling that is observed among many vertebrate groups, including humans.

These evolutionary hypotheses may also be compared with diversification and selective extinction patterns for other vertebrate groups that invaded Amazonian freshwater ecosystems from marine ancestries (e.g., stingrays belonging to Potamotrygonidae Garman, 1877, see Lovejoy, Bermingham & Martin, 1998; croakers in the genus Plagioscion Gill, 1861, see Cooke, Chao & Beheregaray, 2012), in conjunction with the timing of orogenetic events during the late Neogene (Hoorn et al., 2010).

We recovered new fossils pertaining to all of these vertebrate groups — including significant new marine reptile and bird material — and collected an abundance of additional geological data.

Although specimens of fishes, marine reptiles, non-avian dinosaurs, birds, and mammals of this age have all been recovered from this now - frozen continent, most fossils, especially those of land - living species, are fragmentary and poorly informative, and a number of major vertebrate groups that likely once lived in Antarctica (e.g., amphibians, crocodilians) have yet to be discovered at all.

Fishes are a practically ubiquitous group of vertebrates with the potential to help formulate hypotheses that hold relevance for all other vertebrate groups.

Approximately 58 % of the world's 335 turtle species threatened with extinction, which makes turtles the most endangered vertebrate group in the world.

We are also examining size proportions in other vertebrate groups, including reptiles, amphibians, cetaceans, and several fossil groups.

vertebrate The group of animals with a brain, two eyes, and a stiff nerve cord or backbone running down the back.

Classification of Vertebrate groups by ordering characteristics.

We are learning to's include: to classify living things; to identify and name living things; to use a classification key to identify vertebrates and invertebrates; to use a classification key to identify the 5 vertebrate groups; to identify invertebrate groups in their own habitat; to understand how environments change and the dangers this can cause for wildlife.

Frogs are the most threatened vertebrate group on Earth, with nearly one - third of the world's 6,468 amphibian species in danger, the company says.

Not exact matches

This accounts for the tendency, which has been insufficiently noted, of every living phylum (insect and vertebrate) to group itself towards its latter end in socialized communities.

«These results change our understanding of when the largest living group of vertebrates evolved and allow us to iron out a lot of the wrinkles in our understanding of the sequence of evolutionary events.»

There is only one group of vertebrate that has the capacity to regenerate highly complex structures such as limbs, jaws, tail, spinal cord, or eyes throughout their lives: the urodele amphibians.

I was also disappointed that the declaration did not include fish, because the evidence supporting consciousness in this group of vertebrates is also compelling.

«Our results highlight the complexity of the conservation of a group that represents an important part of the world's biodiversity, since almost 10 per cent of the planet's vertebrates are freshwater Amazonian fish,» added Dr Paulo Pompeu, Professor at the Federal University of Lavras in Brazil and another co-author of the study.

Over the last few decades, scientists have observed cannibalism — defined by Schutt as eating all or part of another individual of the same species — among all major groups of vertebrates.

This evidence was crucial because only vertebrates have two different shapes of melanosome, meaning that unlike previous researchers that thought that Tullimonstrum was an invertebrate (animal without a backbone), this is the first unequivocal evidence that Tullimonstrum is a member of the same group of animals as us, the vertebrates.»

The «Tully monster,» an ancient animal that had long defied classification, was in fact a vertebrate, two groups of scientists claimed.

The first group of prints — a 395 - million - year - old track created by a four - legged land vertebrate — made the cover of Nature last January.

«This study reveals some groups of virus have been in existence for the entire evolutionary history of the vertebrates — it transforms our understanding of virus evolution,» said Professor Eddie Holmes, of the Marie Bashir Institute for Infectious Diseases & Biosecurity at the University of Sydney.

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.

A new paper published in latest issue of the Journal of Vertebrate Paleontology shows that several of these Jurassic sites are linked together by shared species and can be recognized as representing a single fossil fauna and flora, containing superbly preserved specimens of a diverse group of amphibian, mammal, and reptile species.

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.

Genome sequencing confirms that myxozoans, a diverse group of microscopic parasites that infect invertebrate and vertebrate hosts, are actually are «highly reduced» cnidarians — the phylum that includes jellyfish, corals and sea anemones.

The extinction that ended the Devonian Era 359 million years ago created opportunities quickly exploited by a formerly rare and unremarkable group of fish that went on to become — in terms of the sheer number of species — the most successful vertebrates (backboned animals) on the planet today: the ray - finned fish.

Humans — along with most other living vertebrates — belong to the same group as bony fish, whose skeletons are made of bone.

Sharks» skeletons are made of cartilage, placing them along with rays and skates in a group of jawed vertebrates called cartilaginous fish.

Both groups report that a strand of rapidly dividing cells on the tip of the growing vertebrate limb, called the apical ectodermal ridge (AER), arises exactly on the border between cells that switch on R - fng and those that don't.

«We were able to show salamander - like regenerative capacities in both — fossil groups that develop their limbs like the majority of modern four - legged vertebrates as well in groups with the reversed pattern of limb development seen in modern salamanders,» said Dr. Jennifer Olori of State University of New York at Oswego, co-author on the study.

The biologists propose to do that by spending $ 60 million to pull together all the known information to assess roughly 160,000 individual species from four groups: chordates (mammals and other vertebrates); invertebrates (insects and worms); plants; and fungi.

The newly described species (artist's representation shown), which lived between 220 million and 230 million years ago, was one of the largest in a group of amphibians known as metoposaurs and is the first known in this region from well - preserved fossils, the researchers report online today in the Journal of Vertebrate Paleontology.

Charles Darwin thought they were relatives of mollusks; in the mid-1800s, however, Russian biologist Alexander Kowalevsky countered that the mobile tunicate larva, with its dorsal cartilaginous column resembling a spine, should be grouped with vertebrates and not clams and snails — even though the adult never develop a backbone.

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.

The number of mammal and bird species varies from place to place, but these groups of vertebrates still span much of the world.

Key groups of forest insects, soil churners and vertebrates disappeared too.

Modern birds, a group called Neornithes (a name that combines neo and a variant of ornis, the Greek words for «new» and «bird,» respectively) are the most diverse and widespread vertebrates on Earth today.

Dunne continued: «We now know that the rainiforest collapse was crucial in paving the way for amniotes, the group which ultimately gave rise to modern mammals, reptiles and birds, to become the dominant group of land vertebrates during the Permian period and beyond.»

«By narrowing down how many species exist within the largest group — the insects and other arthropods — we are now in a position to try to improve estimates for all species, including plants, fungi and vertebrates.

A research group at the University of Helsinki discovered the fastest event of speciation in any marine vertebrate when studying flounders in an international research collaboration project.