Sentences with phrase «pectoral fins»

To determine whether shifts in the balance of anterior and posterior field occurred during fin - to - limb evolution, Onimaru, postdoctoral researcher currently at Sharpe's lab (CRG), and his colleagues carefully compared the expression, function and regulation of genes involved in anterior - posterior patterning in pectoral fins of catsharks, with those of mice.

We hypothesise that the medial orientation of the forces on pectoral fins would result in unreasonably high bone stresses in early amphibious fish with fins, which would explain why the evolutionary invasion of land by vertebrates was accomplished instead by tetrapods with limbs with digits.»

They found that, in pectoral fin of catshark embryos, Gli3 expression was intensified posteriorly, and the balance of the anterior and posterior fields was shifted.

argest accurately measured whale shark coming in at 40 feet, 7 inches in length, with a 4.5 foot wide mouth, a 4.5 foot high dorsal fin, and 6.5 foot long pectoral fins.

Humpback whales are a baleen whale and are renowned for their spectacular behaviour of leaping out of the water, rolling in the air with their huge pectoral fins outstretched like wings, and crash noisily back into the water.

«As pectoral fins evolve different shapes, behaviors, and mechanical properties, we've shown that the sensory system is also evolving with them,» said Brett Aiello, a PhD student in the Department of Organismal Biology and Anatomy, and the lead author of the study.

The results showed that that mudskippers» pectoral fins experience more medial forces than the limbs of salamanders, and that the forelimbs could have a played a similar weight - bearing role as the hind limbs.

Spiked structures on male zebrafish pectoral fins are important for mating but also produce a potent signaling inhibitor.

Often called living fossils, these eel - like misfits have lungs and fleshy pectoral fins, bony plates and thick scales reminiscent of ancient fossil fish, and flag - like fins along their back that are unique.

The fins that were eventually installed on the robot are a pair of flexible pectoral fins made using PVC sheets.

A gurnard fish entered the scene, using its winged pectoral fins to cruise along the bottom.

They have very little nubbins for pectoral fin spines, the arm spines.

Its near relative, Mastacembelus micropectus, has tiny vestigial pectoral fins, which are probably about as useful as the puny arms of Tyrannosaurus rex were.

The whopping pectoral fins are not just for show.

Using zebra fish and chick embryos, Takumi Ito and colleagues from the Tokyo Institute of Technology showed that thalidomide binds to cereblon, causing pectoral fin malformations in zebra fish and the complete absence of forelimbs in chicks.

«But we didn't expect to find that they were exactly the same, especially since we were looking at three different types of appendages: the axolotl limb, the bichir pectoral fin and the zebrafish tail.

For example, virtually all catfish have large pectoral fins that consist of at least one really sharp spine.

Descending down past ledges of pore corals your attention will soon be taken by the common lionfish, sometimes hidden under rock protusions, but often seen parading up and down the wall with their spectacular, barbed pectoral fins raised in display.

Slapping tails and pectoral fins against the surface is another common behavior.

Humpback whales interact with passengers by slapping pectoral fins and revealing their flukes, often in unison.

A humpback whale with head and pectoral fins missing at White Point in San... (Allen J. Schaben / Los Angeles...)

[4] These Cheep Cheeps have wider mouths and smaller, closer together eyes than most depictions, and also have yellow pectoral fins.

The whale shark is the largest fish in the world, and one of the largest creatures alive today, with the largest accurately measured whale shark coming in at 40 feet, 7 inches in length, with a 4.5 foot wide mouth, a 4.5 foot high dorsal fin, and 6.5 foot long pectoral fins.

Pectoral fins of catsharks also contain three basal bones as seen in the ancestral fish.

California flying fish (Cheilopogon pinnatibarbatus californicus) have developed huge pectoral fins that help them glide through the air.

Unlike most underwater species, manta rays possess a unique propulsion mechanism that enables them to cruise through turbulent seas by flapping their pectoral fins effortlessly.

While it is small enough to, yes, fit in your pocket, it's dubbed «pocket» because of the distinctive orifice behind its pectoral fin — one of many physiological features scientists hope to better understand.

Biologists studying fossils in the 19th century thought that coelacanths, with their fleshy ventral and pectoral fins, were likely to have been the first fish to crawl out of the sea.

This tubby fish, about a meter long, swims by flapping its pectoral fins.

Fishing gear was entangled around her mouth, wrapped around both pectoral fins, and trailed about 100 feet behind her tail.

To find out if the animals were really tanning, Lowe placed opaque plastic tags on the pectoral fins of sharks fresh from Kaneohe Bay.

The pectoral fins, sitting just behind the gills, are particularly important for manoeuvrability, and they also play a key role in balance and braking.

Another dozen closely related species of eel are found in the lake, but only in these two are the pectoral fins shrivelled or missing altogether.

Useful and versatile they might be, but for Mastacembelus apectoralis, the pectoral fins seem to have got in the way.

Its pectoral fins, directly behind its head on either side, are enormous and resemble the wings of a butterfly.

The team tested the sensory response by measuring the neural response from the pectoral fin nerves as they bent the fin, and then repeated the process, bending the fins a different amount each time.

With this history of fin evolution in place, the researchers also tested the mechanical properties and sensory system sensitivity in the pectoral fins of four pairs of closely related Labrid species, one with low AR fins and one with independently evolved high AR fins.

Nerves in the pectoral fins of fish detect the fin rays» position and how much they bend as they move through the water, which helps the fish sense speed and the relative position of their fins.

Compared to the northern population, E. kristinae had fewer rays in their pectoral fins and more neuromasts, organs that sense movement and vibration in water.

They compared the forces experienced by the pectoral fins of the mudskipper fishes to the forelimbs and hind limbs of walking tiger salamanders.

The research team previously noticed that male zebrafish regenerate their pectoral fins poorly, as compared to females.

«We discovered that male zebrafish have a very important set of structures on their pectoral fins that they use for breeding and that these structures secrete a potent molecular inhibitor of a key signaling pathway to aid their cycles of regular replacement,» explains senior author Kenneth Poss of Duke University Medical Center.

When the researchers experimentally «posteriorised» pectoral fin buds of catsharks, the fins lost anterior skeletal elements, and showed a single bone connected to the pectoral girdle, as seen in fossil Tiktaalik pectoral fins.

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

Led by first author Junsu Kang, the scientists identified anatomical structures that male fish use during mating that produce a signal that impedes regeneration of the pectoral fins after injury.

The robotic design included visible fish anatomy, such as a dorsal fin, two pectoral fins, two pelvic fins, an anal fin, and a caudal fin.

How about stretching your pectoral fin?

It has a wide, flat head, a rounded snout, small eyes, and five very large gill slits, two dorsal fins on its back and two pectoral fins on its sides.

The whale pushes her away from the shark using its head, tucks her under its pectoral fin, and even lifts her out of the water.