Sentences with phrase «tetrapod limbs»

The researchers discovered similar 3 - dimensional DNA organization of the fish and mouse clusters, which indicates that the main mechanism used to pattern tetrapod limbs was already present in 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.

Not exact matches

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.

Acanthostega is also the first tetrapod with a sacrum, strengthening the pelvis - hind limb connection.

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

Although these species had evolved stronger limbs with defined digits, they still weren't truly tetrapods.

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).

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.

The Fouldenia fossils came from a site in Scotland that also produced the earliest - known post-extinction tetrapods, four - limbed creatures that later crawled ashore and evolved into amphibians, reptiles, birds and mammals.

Because these genes have the same function in zebrafish, humans, and other tetrapods, it should help researchers further understand how our ancestors left the water and evolved limbs from fins.

«These results offer new perspectives in modeling how tetrapods may have taken their first steps onto land, by considering the unique contributions of both the forelimbs and hind limbs,» said lead author Sandy Kawano, a postdoctoral fellow at NIMBioS.

Forelimbs and hind limbs of the first tetrapods evolved to support more weight.

However, the transitional path between fin structural elements in fish and limbs in tetrapods remains elusive.

However, the most of basal bones located in the anterior side (i.e. the thumb side in the human limb) were lost in early tetrapods, and only the most posterior bone remained as the «humerus (i.e. the upper arm of humans).»

The first four - legged, land - living creatures — known as early tetrapods — evolved from fish, following the transformation of fins into limbs.

Previously, salamanders were the only four - limbed creatures, or tetrapods, known to lack lungs.

«Among vertebrate tetrapods — things with four limbs — the axolotl is one of the best regenerators out there.»

«Among vertebrate tetrapods — things with four limbs — the axolotl is one of the best regenerators out there,» says Jeffrey Nelson, a former postdoctoral fellow in regenerative biology at the Morgridge Institute.

In tetrapods (creatures with four limbs), it's the large bone in the upper hind limbs.

Lobe - finned ancestors of the lungfishes as well as tetrapods could have evolved hindlimb propulsion and the ability to walk on the substrate at the bottom of a lake or marsh millions of years before limbs with digits and land - dwelling animals appeared.

Coupled with the ability of the lungfish to fully rotate the limb and place each subsequent footfall in front of the joint, the motion suggests that similar creatures would have been capable of producing some of the fossil tracks credited to tetrapods.

«The fin or limb use thought to be unique to tetrapods is actually more general.»

«In a number of these trackways, the animals alternate their limbs, which suggested that they must have been made by tetrapods walking on a solid substrate,» said Melina Hale, PhD, associate professor of Organismal Biology and Anatomy.