Sentences with phrase «vertebrate eye»

The main focus is to understand how cell biology drives morphogenesis using vertebrate eye formation as a model and zebrafish as main experimental organism.

«It's not too much of a leap to imagine Tully monsters could have evolved an eye that resembled a vertebrate eye.»

Creationists have long contended that the vertebrate eye is too complex to be a product of evolution.

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.

The term macroevolution, by contrast, refers to the origin of new species and divisions of the taxonomic hierarchy above the species level, and also to the origin of complex adaptations, such as the vertebrate eye.

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.

Experiments on cells from frogs have shown that sensitive light - detecting cells in vertebrate eyes, called rod cells, do fire in response to single photons.

Their evidence confirms that the pineal and parapineal glands weren't a pair of organs in the way that vertebrate eyes are.

The discovery in a 300 - million - year - old fish, called Acanthodes bridgei, indicates that these visual receptors have been conserved in vertebrate eyes for at least 300 million years and that the vertebrate in question could likely see in colour.

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.

Not exact matches

Saniwa ensidens is the only known jawed vertebrate to have had two eyelike photosensory structures at the top of the head, in addition to the organs we commonly think of as eyes, researchers report April 2 in Current Biology.

Scientists had long suspected that birds and mammals are the only vertebrates to experience rapid eye movement (REM), a sleep state in which the body is mostly immobile but the brain is in overdrive.

In most vertebrates and some mollusks, the eye works by allowing light to enter it and project onto a light - sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals.

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.

«So the problem is, if it does have cup eyes, then it can't be a vertebrate because all vertebrates either have more complex eyes than that or they secondarily lost them,» Sallan said.

A 300 - million - year - old fossil mystery has been solved by a research team led by the University of Leicester, which has identified that the ancient «Tully Monster» was a vertebrate — due to the unique characteristics of its eyes.

Necessity Is the Mother of Invention: SciJobs.org As a graduate student, Plautz used cellular and molecular biology techniques to examine the interactions that lead to lens and eye formation in vertebrates such as frogs.

Glaw, who has been going to Madagascar to research its ever - expanding list of amphibians and reptiles for a quarter century, said that B. micra may represent the limit of miniaturization possible for a vertebrate with complex eyes, but said it's impossible to know for sure since each time scientists have proclaimed the discovery of the tiniest one yet, another, tinier species appears.

Brookesia micra may represent the limit of miniaturization possible for a vertebrate with complex eyes

Read previous Zoologger columns: Horror fly returns from the dead, Even parasitic worms have a divided society, Shrimp plays chicken with its sex change, Death by world's longest animal, Live birth, evolving before our eyes, Sympathy for the piranha, The world's most fecund vertebrate, Whale - eater's helpful sulphur - powered guests, Horror lizard squirts tears of blood, Secret to long life found... in a baby dragon

Biologists have argued for decades over whether the two basic eye plans of vertebrates and invertebrates evolved independently or originated from a common ancestor.

The two distinctive holes on the side of the head behind each eye of Pappochelys provide vital clues to the evolutionary heritage of turtles, says Torsten Scheyer, a vertebrate paleontologist at the University of Zurich in Switzerland who was not involved in the work.

These fish have a travelling eye and swim on their sides in what is the most extreme example of vertebrate asymmetry — now we know how they develop this useful trait

Read previous Zoologger columns: How weakness makes the crayfish stronger, The heaviest animal in the air, Ancient air - breathing, triple - jawed fish, Horror fly returns from the dead, Even parasitic worms have a divided society, Shrimp plays chicken with its sex change, Death by world's longest animal, Live birth, evolving before our eyes, Sympathy for the piranha, The world's most fecund vertebrate.

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.

Image - forming eyes are found in certain mollusks, bi-valves, most arthropods and nearly all vertebrates.

Read previous Zoologger columns: Ancient air - breathing, triple - jawed fish, Horror fly returns from the dead, Even parasitic worms have a divided society, Shrimp plays chicken with its sex change, Death by world's longest animal, Live birth, evolving before our eyes, Sympathy for the piranha, The world's most fecund vertebrate, Whale - eater's helpful sulphur - powered guests, Horror lizard squirts tears of blood.

As far as the vertebrate / mollusk eye is concerned, intermediate, functioning stages have existed in nature, which is also an illustration of the many varieties and peculiarities of eye construction.

Similarly, the gene for blue eyes codes for paler skin coloring in many vertebrates and hence might have piggybacked along with lighter skin.

«There are many past examples of overly optimistic reporting of supposed soft tissues — skin, liver, eyes, heart — in dinosaurs and other fossil vertebrates that remain unconvincing,» Benton says.

«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.

It's often referred to as the «third eye» and was widespread in primitive vertebrates.

All vertebrate animals (including humans) have two eyes these days.

On the heels of identifying the specific type of cell that gives rise to retinoblastoma, RPB - funded researchers at St. Jude Children's Research Hospital are solving a long - standing mystery about how the eyes of vertebrates develop and how a rare pediatric eye cancer progresses.

'' (Lythronax's) forward - facing eyes, powerful limbs and large size would have made it an efficient hunter of both duckbilled dinosaurs and horned dinosaurs like Diabloceratops,» added co-author Joseph Sertich, curator of Vertebrate Paleontology at the Denver Museum of Nature and Science.

But studying snakes» eyes is important for a more accurate and complete understanding of how vision functions and has evolved in vertebrates more generally.»

The evolution of vision in vertebrates is an important theme in the history of animal life, however, aside from the calcified lenses of fossilised arthropods, other parts of the visual system are not usually preserved in the fossil record because the soft tissue of the eye and brain decays rapidly days after death.

This symposium will provide unique perspective vertebrate head evolution, detailing the evolution of motor systems controlling jaw and head movements, eye movements, parasympathetic control of all head glands and facial branchial motor derived gain control of inner ear hair cells.

Evolution has favoured selection the camera eye that arose in the vertebrate ancestor over 500 million years ago.

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

Vocabulary Reviewed: Classification Kingdom Phylum Invertebrate Vertebrate Class Adaptations Food web Food chain Predator Prey Carnivore Herbivore Producers Consumers Internal Anatomy terms - gonads, brain, heart, ink sac, gills, pen, eye lens External Anatomy terms - mantle, eye, siphon, arms, tentacles, sucker cups, chromatophores, fin, mouth, beak Includes step by step directions as well as photos for the squid dissection and squid races.

In addition to the general characteristics of uniramians, these include a body composed of three tagmata, a head, thorax, and abodmen; a pair of relatively large compound eyes and usually three ocelli located on the head; a pair of antennae, also on the head; mouthparts consisting of a labrum, a pair of mandibles, a pair of maxillae, a labium, and a tonguelike hypopharynx; two pairs of wings, derived from outgrowths of the body wall (unlike any vertebrate wings); and three pairs of walking legs.

Octopuses do not have blind spots in their vision; the structure of their retina and optic nerves is such that, unlike in the eyes of vertebrates, the nerves do not block light or otherwise disrupt the continuity of the retina.